RBH Sound Speaker 1001RB User Guide

1001RB Series  
Owner’s Manual  
1001RB  
1001RB/210  
1001RB/115  
 
1001RB Series  
Congratulations  
Your purchase of a new Gallien-Krueger 1001RB Series  
product is surely the result of much careful consideration  
on your part. For our part, we at Gallien-Krueger are  
pleased that you chose us, and are determined that you  
will be a satisfied customer. In choosing a 1001RB Series  
product, you own an amplifier with many unique features,  
that can take you where you have never been before.  
If your 1001RB Series amplifier or combo did not come  
with all the items listed above, or if you encounter  
problems while setting up your new equipment, please  
contact your local dealer, or us as soon as possible at:  
Gallien-Kruger, Inc.  
2240 Paragon Drive  
San Jose, CA 95131  
phone: (408) 441-7970  
To get the most out of your new purchase please take a few  
minutes to read through this manual. If you are in a  
hurry, we suggest you at least read through the Quick  
Start section before setting up your new rig. This will help  
get you started and give you a few quick tips, but is not a  
substitute for reading the rest of the manual.  
fax:  
(408) 441-8085  
Internet:  
Email:  
We wish you a lifetime of good playing.  
Your amplifier should have come with the following items,  
please check the contents of the box to ensure that you  
have everything.  
Included with your 1001RB Head:  
1001RB  
Rack mount Ears with Hardware  
Power Cord  
4 Conductor Speakon Cable  
Owner’s Manual  
Warranty Card  
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Safety Instructions Sheet  
Included with your 1001RB Combo:  
1001RB/115, or /210  
Power Cord  
Owner’s Manual  
Warranty Card  
Safety Instructions Sheet  
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1001RB Series  
Always Listening  
I have never seen the point in doing things the way  
others have done them. I also have not been very  
interested in following the latest fad. I am a Stanford  
educated engineer who worked his way through school  
as a musician. Like all musicians, I have lugged  
amplifiers up stairways and into car trunks, always  
wondering why these things had to be so heavy, bulky,  
and hard to handle.  
As I am the principal innovator at , our products  
reflect my attitudes and life experiences. I dont model  
my designs after other manufacturers products (as  
some of our competitors are proud of reciting).  
Instead, I believe new and old problems are best solved  
with new solutions. Having taken our own path,  
products enjoy a unique, unmatched sound, allowing  
the artist using them every opportunity to make an  
original statement.  
Having supported my products for over thirty years, I  
have learned from the story they tell.  
is a reflection of that story, and has a commitment to  
support that legacy. Just as the products I created  
thirty years ago are still telling their story, the products  
we create today will be talking to us tomorrow.  
Well be listening,  
Robert Gallien  
4
 
1001RB Series  
Quick Start  
The 1001RB Series is designed to be simple to operate.  
All controls have a well defined purpose and are well  
behaved. These directions will take you through the  
basics and give you a good start for setting up your  
sound.  
Caution:  
First:  
Do not connect the Speakon cable labeled Bridge Mode”  
to the 1001RB. This may result in damage to the ampli-  
fier.  
Set the power switch to Off and connect the supplied  
power cable, from the amplifier AC receptacle, to an AC  
power outlet of proper voltage and power rating (see  
safety information on page 7 for details).  
Then:  
Set all the voicing filtersEQ controls and the Boost control  
to 12 oclock. Set the Woofer/Master to 3 OClock, the  
tweeter to 12 Oclock and the volume to 0. If you have a  
five string bass, push the button marked String Bass in.  
Next:  
Connect your speaker cabinets to the amplifier outputs  
marked 540W AMP ONLY or SPEAKONOUTPUTS. Be  
sure not to exceed the recommended speaker load below.  
Next:  
Using an instrument cable, connect your bass to the Input  
Maximum Recommended Speaker Load:  
One 4 Ohm, or two 8 Ohm cabinets on the 540W Amp.  
One or two 8 Ohm horns on the 50W Amp.  
jack and turn the power switch on and play. If the input  
clipping LED flashes, push the button marked  
in.  
This will prevent you from overdriving the preamp. If  
you have a bass with passive electronics make sure the  
controls are all the way up. If you have a bass with active  
electronics, turn all of the EQ controls on the bass to the  
middle or flat position.  
If you are using an RBH Series cabinet, use the supplied  
4 conductor Speakon cable to connect to the Speakon”  
outputs on the rear panel of the amplifier. Set the Woofer  
X-Over and Tweeter Hi Cut switches on the front panel to  
the IN position. You may want to adjust these later as you  
optimize your sound. In addition, set the switch on the  
RBH cabinet to Bi-Amp.  
Now:  
Slowly bring the Volume up.  
For connection to all other cabinets, connect to the 1/4”  
outputs labeled 540W amp only. Set the Woofer X-Over  
switch on the front panel to the Out position.  
You should be hearing your bass quite well. Your amplifier  
and instrument are currently set in their nominal position.  
From this point further adjustment may be required to  
accomodate your particular instrument, cabinet and  
playing styles. If you are using and RBH Bi-Amp cabinet  
you may want to adjust the tweeter control for balance  
first.  
For more information on Bi-Amp and Normal Operation,  
see page 7.  
Remember:  
Playing loud with the master below 12 O’ clock  
will cause distortion. In some cases this is  
desireable.  
5
 
1001RB Series  
Sound Tips  
The1001RB Series has several unique features which, if  
used properly, will obtain that sound you have been  
searching for.  
The Equalizer:  
Boost/Master:  
The Equalizer is used to fine tune your sound. When  
adjusting it, do it just a little at a time. These are active  
circuits, and small changes can make a big difference in  
your sound. With a little experimentation you will find  
that this equalizer is very easy to use, never sounds weird  
and provides you with a large variety of great sounds,  
unique to GK.  
Turning up the Boost control, will add a little growl to  
your tone. This is an unmistakable GK trade mark  
sound, that you will grow to appreciate. Raising the  
Boost while lowering the Master will add more growl  
while keeping the sound level the same. Growl is  
actually a small amount of even order harmonic distor-  
tion, that sounds great through a woofer, but horrible  
through a horn (see Bi-Amp solution below). For  
most playing situations, the Master is set between 12 &  
3 oclock. The cleanest sound is obtained by setting  
the Master above 12 oclock, and going above 3  
oclock for maximum power situations.  
Contour:  
Increasing the Contour level will scoop out mid-range  
frequencies while boosting the highs and lows. The  
sound, once again, is unique to GK and unavailable on  
any other Bass amp.  
Direct Out:  
The 1001RB provides a low noise, high quality balanced  
direct out for connection to PA and recording consoles.  
With the Pre/Post EQ switch set to Pre(Out), the direct  
output signal is fed directly from our low noise, high  
headroom, FET input stage providing a low noise output  
superior to external direct boxes and impedance trans-  
formers. In addition, this output is calibrated for 1.0V (0  
dBV) output and can be adjusted to unity gain (instru-  
ment level) by adjusting the Level control to -15 dB (U) .  
With the switch in the Pre position, the Direct Output  
signal is only effected by the Level, -10dB Pad, and Tuning  
Mute controls. This allows you to adjust your tone and  
volume on stage without changing the Direct Output  
signal level and confusing your sound man.  
String Bass:  
The way a Bass amp deals with the instrument low string  
is a critical part of its sound. In fact, a five string  
instrument requires an entirely different low end re-  
sponse than a four string instrument. No equalizer can  
make the necessary adjustments to accommodate both.  
However, the String Bass button on the 1001RB Series does  
just that. When it is out, the 1001RB is voiced like the  
800RB (the worlds classic four string amp). Push it  
in and the 1001RB is voiced for five string instruments.  
For some playing styles you may want it in, even with a  
four string instrument.  
Changing the Pre/Post EQ switch to Post( In),  
sends the GK soundand preamp response to the  
Direct Out jack. This gives you complete control over  
the Direct Outs tone and volume. In addition, a  
Ground (Gnd) Lift switch is included to remove hum  
and buzz when connecting to equipment powered by  
a different ground system.  
6
 
1001RB Series  
Bi-Amp and Normal Operation  
The 1001RBs unique design makes setup for Bi-Amp or  
normal configuations simple. The operational mode is  
configured by how you connect your speaker cabinets. In  
addition, you have the option of driving one cabinet in Bi-  
Amp and one in Normal operation.  
1001RB setup up for Bi-Amp Operation:  
1001RB setup up for Normal Operation:  
1001RB setup up for Bi-Amp Operation:  
The Bi-Amp feature of the 1001RB series is automatically  
engaged when you connect an RBH series cabinet (with  
switch on the cabinet set to Bi-Amp) to the 1001RB with  
the supplied 4 conductor Speakon cable. This setup gives  
the 1001RB complete control of the tweeter and woofer  
signals sent to your rig. Now you can push the woofers to  
the max., while the tweeter remains clean, crisp and free  
of clipping distortion. In addition, a smooth tight tone is  
easily dialed in by adjusting the Tweeter and Woofer  
Master controls on the 1001RB front panel. Note: In the  
Bi-Amp configuration, we recommend starting with the  
Woofer X-Over and Tweeter Hi-Cut controls in.  
1001RB setup up for Normal Operation:  
The 1001RB series amplifier is configured for normal  
operation when you are connecting to any cabinet with  
a 2 conductor Speakon cable, 1/4to 1/4speaker  
cable or 1/4to banana plug speaker cable. In this  
setup, the speaker cabinet is driven by the 540W amp  
and the 50W tweeter amplifier is not used. If you are  
using RBH series cabinets, the volume of the tweeter  
(relative to the woofers volume) can be adjusted using  
the Horn Level control of the cabinets internal cross-  
over.  
GK Speakon Cable  
1+ 540W Amp +  
1- 540W Amp -  
GK RBH Series Cabinet  
410RBH, 210RBH, 115RBH  
Set to Full Range mode.  
GK Speakon Cable  
GK RBH Series Cabinet  
1+ 540W Amp +  
1- 540W Amp -  
2+ 540W Amp +  
2- 540W Amp -  
410RBH, 210RBH,  
115RBH  
Set to Bi-Amp mode.  
¼” Speaker Cable  
Tip 540W Amp +  
Shield 540W Amp -  
Any brand name cabinet with  
appropriate impedance and  
power rating.  
7
 
1001RB Series  
Safety Information  
Do Not Use Extension Cords:  
Verify Line, Voltage and Amperage Before  
Use:  
Your new 1001RB Series Bass Amp has been factory  
To avoid safety hazards, use only the power cord supplied  
with your unit. If a replacement cord is used, make  
certain that it is of consistent quality and gauge as the  
original. We do not recommend using extension cords  
with this product. As with all electrical devices, do not  
run power cords under rugs or carpets or place heavy  
objects on them. Damaged power cords should be  
replaced immediately with cords meeting factory specifi-  
cations.  
configured for use with:  
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120 Volt/60Hz 20 Amp circuit for USA & Canada.  
230 Volt/50Hz 10 Amp circuit for Europe  
& Australia.  
100 Volt/50Hz 20 Amp circuit for Japan.  
Proper AC circuit for all other countries.  
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Connecting the amplifier to a line with specifications  
other than indicated above can create a safety and fire  
hazard, and may damage the amplifier. If you have any  
questions about the voltage requirements for your  
specific model, or about the line voltage in your area,  
contact your dealer before plugging the unit into a wall  
outlet.  
Handle The AC Power Cord Gently:  
When disconnecting the power cord from an AC outlet,  
always pull the plug, never pull the cord. If you do not  
intend to use the amplifier for a considerable length of  
time, disconnect the plug from the AC outlet.  
Verify AC Circuit Capacity Before Use:  
The high power output of your amplifier may require  
heavy current draw under Full-Load conditions. To  
insure proper performance and avoid potential safety  
hazards, we recommend connection to line circuits with  
Amperage specified as above. Connecting multiple  
amplifiers to the same circuit, or connecting the ampli-  
fier to the same circuit used by other heavy-power  
devices, such as high-wattage lights, may cause circuit  
breakers to trip. It is always a good idea to avoid using  
any audio equipment on the same AC circuit as equip-  
ment with motors, such as air conditioners or refrigera-  
tors. This will lessen to possibility of power variation and  
electrical start-up noise affecting your sound.  
Do Not Open The Amplifier Enclosure:  
There are no user-serviceable components inside this  
product. Opening the amplifier enclosure may present a  
shock hazard, and modification to the product will void  
your warranty. If liquid enters the unit, or any metal  
object such as a paper clip, wire, or staple accidentally  
falls inside the enclosure, disconnect the unit from the  
AC power source immediately and consult an authorized  
service station.  
Unpacking:  
The carton and packing materials used in shipping your  
new amplifier were specially designed to cushion it from  
the shocks and vibration that occur during transport. We  
suggest that you save the carton and packing materials  
for use in shipping, in the event you move, or the  
amplifier needs repair.  
8
 
1001RB Series  
Installation and Maintenance  
Installation:  
Cleaning:  
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To insure proper operation and to avoid  
potential safety hazards, place the unit on a  
firm, level surface. When installing the unit  
in a rack, be sure the mounting hardware can  
support the amplifiers weight. To save space  
in your rack, the 1001RBs feet can be  
removed using a Philips head screwdriver.  
Make certain that proper space is provided for  
ventilation. The 1001RB Series requires at  
least ½ inch clearance above for proper  
ventilation. Never block the fan vent holes in  
the top or front of the amplifier. If the  
amplifier will be installed in a rack or other  
enclosed area, make sure that there is  
sufficient air movement within the enclosure  
to allow proper cooling. Consult your dealer  
for more information.  
When the unit gets dirty, wipe it with a clean, soft and  
dry cloth. If necessary, first wipe the surface with a  
soft cloth slightly dampened with mild, soapy water,  
followed by a fresh cloth with clean water. Wipe  
immediately with a dry cloth. Never use benzene,  
thinner, alcohol, or other volatile cleaning agents.  
Do not use abrasive cleaners, as they may damage the  
finish of metal parts. Avoid spraying insecticides near  
the unit.  
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Maintenance:  
Your new amplifier is rugged. It was built to give you a  
lifetime of trouble-free operation, if it is operated in  
accordance with the instructions contained in this  
manual. The only maintenance required is cleaning. If  
you are going to move your amplifier around frequently,  
we recommend a road case to protect it from scratches  
and road wear.  
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Avoid installation in extremely hot or cold  
locations, and areas that are exposed to direct  
sunlight, or near heating equipment.  
Avoid moist or humid locations.  
Remember, power amplifiers generate heat.  
The heat sink fins and ventilation slots that  
form part of the enclosure are specially  
designed to remove this heat. Placing other  
electronic equipment near these heat-  
dissipation systems may possibly affect the  
long-term reliability of both your amplifier  
and the other equipment.  
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Moving the Unit:  
Before moving the unit, be certain to disconnect any  
interconnection cords with other components, and make  
sure that you disconnect the unit from the AC outlet.  
9
 
1001RB Series  
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18  
12 13  
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19  
Front Panel Controls  
1-Balanced Direct Out:  
9-High Mid:  
An electronically balanced output, that you can run  
to your P.A. system.  
2-Pre/Post EQ Button:  
Boost and cut at 1 kHz +10dB, Q Optimized,band  
pass type. Works on lower string harmonics, and  
effects the punch of your sound.  
Selects the direct out signal from before or after the EQ.  
3-Direct Level Out  
Controls the level at the direct out jack.  
4-Input:  
A standard ¼” input jack and input attenuator button.  
The button is generally left out, except in rare cases when  
the clip LED flashes.  
Boost and cut at 250Hz +10dB, Q Optimized,”  
band pass type. Works on the main body of your sound.  
11-Bass:  
Boost and cut at 60Hz +10dB, shelving type. Controls  
low end push.  
12-Boost:  
5-Tuning Mute Button:  
A post EQ gain stage using GIVE technology which adds  
growlas it is turned up.  
Set this switch to Onwhen tuning up. No signal will be  
sent to the speakers, or the P.A. system.  
13-Tweeter/Master:  
Controls output level to tweeter.  
6-Volume:  
Sets pre-amp gain after the input stage. It is used in  
conjunction with the input pad, to optimize the amplifiers  
headroom.  
14-Tweeter Hi-Cut:  
Cuts frequencies above 10kHz, producing a more  
conelike sound from the tweeter.  
7-Voicing Filters:  
15-Woofer/Master:  
String Bass:  
Controls output level of 540W amplifier. For Bi-Amp  
operation, this controls the woofer level.  
16-Woofer X-Over:  
Set this button to engage the electronic crossover for the  
woofer. The tweeter is always crossed over.  
17-Effects Loop:  
Send and return jacks provided for the insertion of  
effects after the EQ, but before the boost section. Some  
effect units have gain, turning the BOOST down, will  
compensate for this.  
18-Tuner Output  
Output to tuner.  
Setting this button voices the pre-amp for basses with B”  
tuning. Leave it out and the amp is voiced like the 800RB,  
for 4 string basses.  
Contour:  
Drops the mid-range frequencies while boosting lows &  
highs.  
Presence:  
Adds edge and definition to higher frequencies.  
Active Equalization:  
8-Treble:  
Boost and cut at 7 kHz +15dB shelving type. Add or  
remove edge and definition.  
19-Power Switch  
Turns the amplifier on or off. Should a problem occur  
during operation press this switch first.  
10  
 
1001RB Series  
3
1
2
Rear Panel Controls  
CAUTION:  
1- AC Receptacle:  
The power cord is detachable and plugs in here.  
2- 540W Amp Only:  
540W power amp output for Full-Range operation only.  
They deliver 540 watts into 4 Ohms. Lower impedances  
should not be used. Each jack has a minimum of 8 Ohms  
each. Higher impedances such as 8 Ohms, 16 Ohms, or  
No Load are acceptable. No damage will result from  
operating the amplifier with the speakers disconnected.  
3- “Speakon” Outputs:  
UNDER NO CIRCUMSTANCES  
SHOULD THE 540W AMP AND THE  
50W AMP BE CONNECTED  
TOGETHER OR BE CONNECTED  
TO THE SAME SPEAKER !!!  
Enables BI-AMP operation by connecting a GK-RBH  
Series cabinet with the provided 4 conductor Speakon  
cable. This connects the 50W amplifier allowing the  
Tweeter control on the front panel to control the signal  
going to the horn. See Bi-Amp and Normal Operation  
on page 7 for more information.  
Caution:  
Do not connect a Speakon cable labeled Bridge  
Modeto the 1001RB. This may result in damage to the  
amplifier.  
Maximum Recommended Load:  
One 4 Ohm or two 8 Ohm cabinets on the 540W Amp.  
One or two 8 Ohm horns on the 50W Amp.  
11  
 
1001RB Series  
1001RB Series Combos  
The 1001RB Series combos deliver the1001RBs unique  
features and distinct sound by using a variety of  
internal speaker configurations, GKs RBH cabinet  
technology and a unique Lock NRoll transport  
system.  
Speaker Configurations:  
Lock NRoll Transport System:  
1001RB/115  
One 8 Ohm 15speaker and  
one 8 Ohm horn  
The Lock NRoll transport system is designed for quick  
and easy rolling of the combo on flat surfaces such as  
carpet, flooring, pavement, etc. To engage the Lock N’  
Roll handle, first move the combo into the upright  
position (front perpendicular to the ground). Next, stand  
behind the cabinet and lift the Lock NRoll handle up with  
your right hand. The handle will lock into place after  
about 1 1/2 feet. Finally, grab the handle and tilt towards  
the back of the combo. The wheels on the bottom of the  
cabinet will automatically engage and allow smooth  
rolling.  
1001RB/210  
Two 16 Ohm 10speakers  
(wired in parallel for an 8  
Ohm equivalent load)and  
one 8 Ohm horn  
The 1001RB combo electronics are identical to the1001RB  
head and are rated for the same maximum power output  
and speaker load (540W into 4 Ohms, and 50W into 4  
Ohms). Maximum power is achieved by connecting one 8  
Ohm extension cabinet (such as the 210RBH, 410RBH,  
or 115RBH) in addition to the combos internal 8 Ohm  
speaker load. To drive more than one extension cabinet,  
the combos internal speaker can be disconnected by  
unplugging the Speakon cable connected to the combos  
back panel. Below is a detailed description of the maxi-  
mum loads the combos can drive.  
To disengage the Lock NRoll system, first return the  
combo to its upright position and stand behind the unit.  
Next, with your left hand, pull the locking latch at the  
base of the handle to your left, while pushing the handle  
down gently with your right hand. Finally, push the  
handle down until it stops and is flush with the top of the  
combo.  
Maximum recommended load with the  
internal speaker connected:  
One 8 Ohm cabinet on the 540W Amp.  
The 1001RB Series combos are designed for maximum  
setup versatility to accommodate a variety of playing  
situations. For practicing and close monitoring situations,  
tilt the cabinet back into its Rock Backposition. For  
stronger bass and audience projection, leave the combo in  
the upright position.  
One 8 Ohm horn on the 50W Amp.  
Maximum recommended load with the  
internal speaker disconnected:  
One 4 Ohm, or Two 8 Ohm cabinets on the 540W Amp.  
One or Two 8 Ohm horns on the 50W Amp.  
12  
 
1001RB Series  
Tech Talk  
Characteristics of the 1001RB:  
The1001RB Series is a flexible, state-of-the-art Bass  
Amplifier, designed to deliver maximum performance,  
and be simple to operate. This is accomplished through a  
few, very important features:  
There is nothing in the 1001RB Series power amp to come  
between you and your sound except faithful, raw power.  
Bi-Amp Sound:  
Bass players have always liked the growl they get from  
slight overdrive. In GK amps this comes partly from  
the boost circuits and partly from the power amp. The  
problem is that growl, sounds great through woofers, and  
horrible through horns. In the typical full range system  
with a passive crossover, there is no way to get growl and  
keep the definition that the horn provides. The horn  
always has to be turned down. In a Bi-Amp system like  
the 1001RB Series, the woofer and the horn, each have  
their own power amp, allowing us to get growl in the  
woofer only, while keeping the horn sound crystal clear.  
Now you can over-drive the woofer as much as you want,  
and leave the horn all the way up, keeping the definition it  
brings to your sound. Running the 1001RB Series in Bi-  
Amp mode through a GK-RBH cabinet, for the first time  
allows full access to the benefits of Bi-Amp sound. This is  
the reason the 1001RB Series is a Bi-Amp, and it is the  
reason you will be able to explore an entirely new territory  
of Bass sound.  
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Extremely high current power supply and  
power amp circuitry, gets the sound out of  
your head.  
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Bi-Amp sound, two power amps, 540 Watts for  
the woofer, and 50 Watts for the horn.  
Electronic crossover, seamless two way sound.  
Four, Bass specific bands of active  
equalization for precise tone control.  
Three voicing filters for shaping and  
customizing your sound.  
Balanced direct output with level control  
eliminates need for a direct box.  
Continuously variable fan cooling.  
Designed and Built in the U.S. for years of  
reliability and quality service.  
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Current Output & Bass Response:  
When a power amplifier is pushing several speaker cones,  
and a high-power transient like a string slap comes along,  
the amp has to tap into a large power reserve to maintain  
cone control. Its kind of like grabbing a swing at the  
bottom of its travel and trying to push it the other way - it  
could knock you over. If the amplifier doesnt have this  
ability, the sound is unresponsive and less out front. The  
amp loses its punch and feel at higher playing levels.  
Instead of responding to your every command, the  
amplifier simply cuts those transients off, leaving you with  
the feeling that something is missing in your sound.  
In addition, running high power amplifiers like the  
1001RB Full-Range into cabinets with passively crossed  
over horns can cause failure to the horn, attenuator or  
protection elements in the speaker cabinet. Running high  
power amplifiers as Bi-Amp rigs eliminates these  
problems.  
Since most amplifiers have limited output current  
capacity, they need current limiting circuitsto  
protect against self-destruction. High-power tran-  
sients trigger these circuits, which rob the amplifier of  
its ability to control speaker cones. This creates a  
mushy, unresponsive feel to your sound. The 1001RB  
Series has extremely high current capacity, so it doesnt  
need current limiting circuits for over-load protection.  
13  
 
1001RB Series  
Tech Talk  
Voicing Filters:  
Electronic Crossover:  
Voicing filters are used to completely re-voice the  
amplifier. In the case of the Contour and String Bass  
controls, the effect is dramatic.  
Bi-Amp systems allow the crossover to be electronic and  
therefore, have much higher quality than passive cross-  
overs. A crossover separates the sound into two parts  
(high and low frequency). The highs are sent to the horn  
or high frequency cabinet and the lows are sent to the  
woofer. In an ideal system, adding the highs and the lows  
back together would recover the original signal. Most  
passive Bass systems have very poor crossovers, resulting  
in severe signal corruption. When these signals are added  
back together (as in your ear), they have very little in  
common with the original signal. The 1001RB Series uses  
a Constant Voltage crossover which results in very little  
signal corruption. In fact, when the high and low signals  
are added back together, the result is extremely close to  
the original. This makes a two-way system sound more  
seamless, and less artificial. We have also included a  
Tweeter Hi-Cut switch in the crossover, which rolls the  
tweeter off above 10kHz giving it a less glassy, more cone  
like sound.  
The Contour control tunes between two different shaping  
circuits, with greatly different response. With the control  
all the way up, the low end is slightly boosted, the mids  
are dropped and the high end is pushed up. This is a  
response contour not available with a normal equalizer,  
and is only found in GK amplifiers.  
The way a Bass amp deals with the instrument low string  
is a critical part of its sound. In fact, a five string  
instrument requires an entirely different low end re-  
sponse than a four string instrument. No equalizer can  
make the necessary adjustments to accommodate both,  
however the String Bass button on the 1001RB Series does  
just that. When it is out, the 1001RB is voiced like the  
800RB (the worlds classic four string amp). Push it in  
and the 1001RB is voiced for five string instruments. For  
some playing styles you may want it in, even with a four  
string instrumentat least now, you have a choice!  
Equalization:  
The sound you want is in your head, but you just cant get  
it. You think its you, your bass or maybe your amp. Yes,  
your amp. Standard tone controls and graphic equalizers  
dont get it. Sure, they give you plenty of variation, but  
they dont provide what the instrument really needs. The  
fact is, graphic equalizers are intended for room equaliza-  
tion, and are only put in bass amps because its a no-  
brainer for the designer. The equalization in Gallien-  
Krueger amplifiers reflects 30 years of continuous  
development and refinement. The GK equalizer is unique  
to the industry, its not just a normal four band equalizer,  
each section is a special circuit optimized to perform a  
Bass specific job in its range of operation. These sections  
are wired in Series, so they add to one another creating a  
tremendously flexible equalizer, that doesnt sound weird  
at any setting. You actually might even get to hear that  
sound in your head.  
“G.I.V.E.” Technology:  
As in all GK pre-amps, the1001RB Series pre-amp  
incorporates what we call G.I.V.E (Gate Induced Valve  
Effect) Technology. We use field effect devices with the  
gate biased in a way that emphasizes the optimum  
harmonic content of the signal. Working in concert with  
our unique Four Band Active Equalizer, and three stage  
Voicing Filter Section, G.I.V.E. technology produces a  
consistently pleasing bass tone.  
14  
 
1001RB Series  
Tech Talk  
Speakon Cables:  
Cool Running = Reliability:  
The 1001RB Series uses a dual rail power supplythat  
generates about half the heat of conventional amplifiers.  
Low output signals run off a low voltage supply, and high  
level signals run off a high voltage supply. This keeps  
the amp running a lot cooler and makes it much more  
reliable. To cool the amp when its being driven hard,  
weve designed a temperature sensitive fan cooling  
system. When the amp is under a light load, the fan is  
off or running at a low speed, reducing fan noise. As the  
amp works harder, the fan speed increases to keep  
everything cool.  
To make use of the 1001RBs Bi-Amp feature you will  
need to use the four conductor Speakon cable (provided  
with the 1001RB head, and included with the combos for  
connection to the internal speaker) to connect to a GK  
RBH Series cabinet. This specially designed cable carries  
the signals for both amplifiers (540W Woofer Amp and  
50W Tweeter Amp) to the speaker cabinet. Plus, they are  
the coolest speaker connectors currently available. Below  
is a table describing the Speakon cable connections to the  
1001RB head and combos.  
Speakon Pin #  
1+  
1-  
2+  
2-  
Signal  
WireColor  
White  
Black  
540W Woofer Amp +  
540W Woofer Amp -  
50W Tweeter Amp +  
50W Tweeter Amp -  
Smart Protection Circuitry:  
The 1001RBs protection circuitry constantly monitors for  
unsafe operating conditions such as short circuits, miss-  
wired speaker cables, blown speakers, improper ventila-  
tion and incorrect speaker configurations. In addition,  
protection is provided during power up/down. If the  
1001RB senses any unsafe operating conditions, the  
output signal is immediately muted and the power light  
changes to from Green to Red. The amplifier will remain  
muted until the fault is removed. If the protection circuit  
activates while playing, turn the amplifier off and check  
the amplifier speaker output connections. Be sure that  
you are not exceeding the maximum recommend load  
described in this manual. Also, check to see that you have  
connected the amplifier to your speakers as described in  
Bi-Amp and Normal Operation on page 7. If the problem  
persists, contact GK directly for advice.  
Red  
Green  
To obtain an additional 4 conductor Speakon cable for  
use with the 1001RB please contact your local  
dealer or contact GK directly.  
In Closing:  
You should now have a thorough understanding of how  
your new 1001RB Series amplifier works and what  
advantages it can offer you in getting yoursound. We  
thank you for reading the Owners Manual and wish you  
the best of times! Please send us your comments via  
Low Noise Operation:  
The 1001RB Series uses a high gain, high headroom, low  
noise input stage. It has such a large dynamic range (60v  
p-p) that very few instruments can overdrive it. Even most  
basses with activeelectronics do not need the input  
attenuator to be set. The benefit to you is less hiss from  
your horn, and over all, much less noise.  
15  
 
1001RB Series  
Block Diagram  
1001RB Series Specifications:  
Output Power:  
540W Amplifier  
Cooling  
Amplifier Protection:  
Continuously Variable-  
Speed Fan  
540W @ 8 Ohms  
540W @ 4 Ohms  
50W @ 8 Ohms  
50W @ 4 Ohms  
50W Amplifier  
Full short circuit, thermal,& RF protection.  
Stable into reactive and mismatched loads.  
Five second muted warm-up.  
Input Section:  
Maximum Input Level  
With -10dB pad  
Input Impedance  
Send output impedance  
Return input impedance  
Tuner Output Impedance  
Direct Output Impedance  
Equalizer:  
Bass  
Lo-Mid  
Hi-Mid  
Treble  
0.6V Rms  
1.6V Rms  
1M Ohm  
220 Ohm  
50k Ohm  
10k Ohm  
500 Ohms  
Dimensions (HxWxD):  
3 1/2x 17x 8 ¼”  
(2 Rack Spaces)  
Weight:  
18lbs  
Power Requirements:  
U.S.A./Canada  
+10db @ 60Hz  
120V/60Hz  
880W (full power)  
165W (average power)  
+6db/-10db @ 250Hz  
+6db/-10db @ 1kHz  
+14db @ 7kHz  
Voicing Filters:  
String Bass Button  
Contour  
Europe  
Japan  
230V/50Hz  
880W (full power)  
165W (average power)  
+11db@20Hz  
+2db@50Hz /  
-10db@500Hz /  
+3db@7kHz  
+9db@10kHz  
Triple pole constant  
voltage crossover at 5kHz  
-90db referenced to 540W,  
Aweighted  
100V/50Hz  
880W (full power)  
165W (average power)  
Presence  
Crossover  
Noise  
1001RB Series Owner’sManual  
Part#160-0030-A  
16  
Printed in the U.S.A.  
 

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