400RB Series

Owners Manual

400RB-III

400RB/112

400RB/115

Table of Contents

Table Of Contents

Introduction... 3 Quick Start...5 Sound Tips... 6 Safety Information... 7 Installation and Maintenance.. 8 Front Panel Controls... 9 Rear Panel Controls.. 10 400RB Series Combos...11 Tech Talk...12 Specifications... 14 Notes... 15
*All Features and specifications are subject to change without notice. **This list is subject to change without notice.
CAUTION: O CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE NOT REMOVE
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Gallien-Krueger

2240 Paragon Dr. San Jose, CA, 95131 phone: 408-441-7970 fax: 408-441-8085 www.gallien-krueger.com
400RB Series Congratulations
Your purchase of a new Gallien-Krueger 400RB 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 400RB Series product, you own an amplifier with many unique features, that can take you where you have never been before. 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. 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 400RB Head: 400RB Rack mount ears with hardware Power cord Owners manual Warranty card Safety instructions sheet Included with your 400RB Combo: 400RB/112, or /115 Power Cord Owners Manual Warranty Card Safety Instructions Sheet If your 400RB Series amplifier or combo did not come with all the items listed, or if you encounter problems while setting up your new equipment, please contact your local dealer, or us as soon as possible at: Gallien-Krueger, Inc. 2240 Paragon Drive San Jose, CA 95131 phone: (408) 441-7970 fax: (408) 441-8085 Internet: www.gallien-krueger.com Email: sales@gallien.com We wish you a lifetime of good playing and remember to always have fun!

Introduction

400RB 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 G K, 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, G K 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. Gallien-Krueger 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

400RB Series Quick Start
The 400RB 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.

Quick Start

First:
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).
Set the master control to 12 oclock and slowly bring the Master volume up. Do not turn the Volume control in the input section past 12 oclock unless you want an overdrive effect. 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.
Connect your speaker cabinets to the amplifier outputs marked 240W. Be sure not to exceed the recommended speaker load listed below.

At This Point:

You should be hearing your bass quite well. You can use the Volume and Master to achieve a comfortable sound level. R e m e m b e r : If you need more volume, turn up the Master control first.
Maximum Recommended Speaker Load:
One 4 Ohm, or two 8 Ohm cabinets. If you are using an RBH series cabinet, set the crossover switch to full range.
Set all EQ controls and the Boost control to 12 oclock. The Voicing Filters should be turned all the way down to get a flat response. Set the Volume and Master Volumes at 0. If you have a five string bass, push the button marked String Bass in.
Using an instrument cable, connect your bass to the Input jack and turn the power switch on and play. If the clip LED flashes, push the button marked - d b in. This will prevent you from overdriving the preamp.

400RB Series Sound Tips

The 400RB Series has several unique features which, if used properly, will obtain that sound you have been searching for.

Sound Tips

The Equalizer:
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.

Boost/Master:

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 distortion, that sounds great through a woofer. 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 midrange 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 400RB 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 transformers. The Direct Output signal is only effected by the -10dB Pad, and Tuning Mute controls. This allows you to adjust your tone and volume on stage without changing the Direct Out signal level and confusing your sound man. Changing the Pre/Post EQ switch to Post (In), sends the GK sound and 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.

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 response than a four string instrument. No equalizer can make the necessary adjustments to accommodate both. However, the String Bass button on the 400RB Series does just that. When it is out, the 400RB is voiced like the 800RB (the worlds classic four string amp). Push it in and the 400RB is voiced for five string instruments. For some playing styles you may want it in, even with a four string instrument.

400RB Series Safety Information
Verify Line Voltage and Amperage Before Use:
Your new 400RB Series Bass Amp has been factory configured for use with: 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. 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.
Do Not Use Extension Cords:

Safety Information

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 specifications.
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 amplifier 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 equipment with motors, such as air conditioners or refrigerators. 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.

Installation & Maintenance
Installation and Maintenance

Installation:

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 400RBs feet can be removed using a Philips head screwdriver. Make certain that proper space is provided for ventilation. The 400RB Series requires at least 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. 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 heatdissipation systems may possibly affect the long-term reliability of both your amplifier and the other equipment.

Cleaning:

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.

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.

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.

Front Panel Controls

1-Balanced Direct Out:
An electronically balanced output, that you can run to your P.A. system.

2-Pre/Post EQ Button:

9-Low Mid:
Selects the direct out signal from before or after the EQ.

3-Input:

Boost and cut at 250Hz +6dB -10dB, Q Optimized, band pass type. Works on the main body of your sound.

10-Bass:

A standard input jack and input attenuator button. The button is generally left out, except in rare cases when the clip LED flashes.

4-Tuning Mute Button:

Boost and cut at 60Hz +10dB, shelving type. Controls low end push.

Outputs: 11-Boost:

Set this switch to On when tuning up. No signal will be sent to the speakers, or the P.A. system.

5-Volume:

A post EQ gain stage using GIVE technology which adds growl as it is turned up.

12-Master:

Controls output level of the amplifier.

13-Effects Loop:

Sets pre-amp gain after the input stage. It is used in conjunction with the input pad, to optimize the amplifiers headroom.
6-Voicing Filters: String Bass:
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.

14-Tuner Output

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.

Output to tuner.

15-Power Switch
Drops the mid-range frequencies while boosting lows & highs.

Presence:

Turns the amplifier on or off. Should a problem occur during operation press this switch out first.
Adds edge and definition to higher frequencies.
Active Equalization: 7-Treble:
Boost and cut at 7kHz+14dB shelving type. Add or remove edge and definition.

8-High Mid:

Boost and cut at 1 kHz +6dB -10dB, Q Optimized, band pass type. Works on lower string harmonics, and effects the punch of your sound.

Rear Panel Controls

1- AC Receptacle:
The power cord is detachable and plugs in here.

2- 240W Jacks:

240W power amp output for Full-Range operation only. They deliver 240 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.
400RB Series 400RB Series Combos
The 400RB Series combos deliver the 400RBs unique features and distinct sound by using a variety of internal speaker configurations in compact enclosures.

400RB Series Combos

Speaker Configurations:
400RB/112 400RB/115 One 8 Ohm 12speaker One 8 Ohm 15speaker
The 400RB combo electronics are identical to the 400RB head and are rated for the same maximum power output and speaker load (240W into 4 Ohms). Maximum power is achieved by connecting one 8 Ohm extension cabinet (such as the 210RBS, 410RBS, or 115RBS) 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 speaker cable connected to the combos back panel. Below is a detailed description of the maximum loads the combos can drive.
Maximum recommended load with the internal speaker connected:

One 8 Ohm cabinet.

Maximum recommended load with the internal speaker disconnected:
One 4 Ohm, or Two 8 Ohm cabinets.

400RB Series Tech Talk

Characteristics of the 400RB:
The 400RB Series is a flexible state-of-the-art bass amplifier, designed to deliver maximum performance and simple operation. This is accomplished through these important features: Extremely high current power supply and power amp circuitry, gets the sound out of your head. Four, bass specific bands of active equalization for precise tone control. Three voicing filters for shaping and customizing your sound. Balanced direct output eliminates the need for a direct box. Continuously variable fan cooling. Designed and Built in the U.S. for years of reliability and quality service. There is nothing in the 400RB Series power amp to come between you and your sound except faithful, raw power.

Tech Talk

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 equalization, 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. Now it is possible to obtain the sound you desire.

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. Since most amplifiers have limited output current capacity, they need current limiting circuits to protect against self-destruction. High-power transients trigger these circuits, which rob the amplifier of its ability to control speaker cones. This creates a mushy, unresponsive feel to your sound. The 400RB Series has an extremely high current capacity, over fifty amps, so it doesnt need current limiting circuits for over-load protection.

Voicing Filters:

Voicing filters are used to completely revoice the amplifier. In the case of the Contour and String Bass controls, the effect is dramatic. 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 contour response 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 response than a four string instrument. No equalizer can make the necessary adjustments to accommodate both, however the String Bass button on the 400RB Series does just that. When it is out, the 400RB is voiced like the 800RB (worlds classic four string amp). Push it in and the 400RB 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!
Cool Running = Reliability:
To cool the 400RB 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.
Smart Protection Circuitry:
The 400RBs protection circuitry constantly monitors for unsafe operating conditions such as short circuits, miswired speaker cables, blown speakers, improper ventilation and incorrect speaker configurations. In addition, protection is provided during power up/ power down. If the 400RB senses any unsafe operating conditions, the output signal is immediately muted and the power light changes 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. If the problem persists, contact GK directly for technical advice.

Low Noise Operation:

The 400RB 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 active electronics do not need the input attenuator to be set. The benefit to you is less hiss from your horn, and overall, less noise.

G.I.V.E. Technology:

As in all GK pre-amps, the 400RB 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.

In Closing:

You should now have a thorough understanding of how your new 400RB Series amplifier works and what advantages it can offer you in getting your sound. We thank you for reading the Owners Manual and wish you the best of times! Please send us your comments via www.gallien-krueger.com or email us at sales@gallien.com.
400RB Series Block Diagram

Specifications

400RB Series Specifications:
Output Power: 240W Amplifier Dimensions(HxWxD): 150W @ 8 Ohms 240W @ 4 Ohms Weight: Power Requirements: U.S.A./Canada 120V/60Hz-410W (at full power) 230V/50Hz-410W (at full power) 100V/50Hz-410W (at full power) 3 1/2 x 17 x 8 (2 Rack Spaces) Input Section: Maximum Input Level 0.6V Rms With -10dB pad 1.6V Rms Input Impedance 1M Ohm Send output impedance 220 Ohm Return input impedance 50k Ohm Tuner Output Impedance 10k Ohm Direct Output Impedance 500 Ohms Equalizer: Bass +10db @ 60Hz Lo-Mid +6db/-10dB @ 250Hz Hi-Mid +6db/-10dB @ 1kHz Treble +14db @ 7kHz Voicing Filters: String Bass Button +11db@20Hz Contour +2db@50Hz / -10db@500Hz / +3db@7kHz Presence +9db@10kHz Noise -90db referenced to 240W, A weighted Cooling Continuously Variable-Speed fan Amplifier Protection: Full short circuit, thermal,& RF protection. Stable into reactive and mismatched loads. Five second muted warm-up.

Europe Japan

400RB Series Notes:
400RB Series Owners Manual Part #160-0003-A Printed in the U.S.A.

Operating Instructions

Operating Instructions 400RB
THE BASICS Your new 400RB represents the latest advances that technology has to offer. It was designed to provide the widest possible range of usable sounds. The combination of three voicing filters with four bands of active EQ is unbeatable for flexibility and ease of operation. This amplifier has many features, all of which are described here. A careful examination of this manual will help you to get the most from them. INPUT SECTION This section contains the 1/4'' input jack and the input attenuator. With the attenuator out the maximum input level is 1Vrms (3V P-P). For larger input signals the input attenuator should be set. This reduces the gain of the input stage by 10 dB, increasing the input head room to 3V rms (10 P-P). EFFECTS LOOP Located on the rear panel, it is provided for the insertion of effects. It is post EQ but pre boost and master. Using standard guitar cords connect the effects input to the send and the effects output to the return. The boost and master controls will effect any signal put into the return jack. The level is 1.5V rms (4.5V P-P) into 100K ohm.
other than the recommended fuse. 120V operation - replace with type 3AG4A 240V operation - replace with type 3AG2A 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 above. The only maintenance required is cleaning. We recommend a soft damp cloth and mild soap for cleaning the outside surfaces. If you are going to pack your amplifier around a lot, we recommend a road case to protect it from scratches and road wear.

Setting up your Sound

Your amplifier is designed to sound about right with the tone controls set flat (5). We therefore recommend you start with the EQ set flat and the voicing filters out. Helpful Hints 1. Don't be afraid to experiment with the EQ on your bass first. Make sure that you have as close to the sound you want from your bass before adjusting the EQ on your amp. 2. Set your playing level first. You may want to push up your volume and boost levels while dropping back the master. This will give a fatter sound but can add distortion. Some players find this desirable, you will have to be the judge. For the cleanest possible sound, operate the master on 10 (max). The boost control is footswitchable and can act as a pre-set volume. The L.E.D. next to the boost control indicated that boost is on. 3. Once your basic levels are set, work with the voicing filters. The Lo Cut is a bass roll off and is used to control stage rumble at high volume. Mid Cut puts a notch at about 500hz giving a mellow round sound. Hi Boost adds edge and definition. 4. Having set your levels and filters, you are ready to fine tune your tone. This is an involved procedure requiring you to use your ears to tell you what is right. We have broken the sound spectrum into four basic bands and provided active controls for each. Adjustment procedures are repetitive and require patience. TREBLE : Boost and cut at 4khz, will add or remove edge and definition. HIGH MID : Boost and cut at 1khz. There is a lot of sound in this band, it works on the lower harmonics of your instrument and affects the punch of your sound. LOW MID : Boost and cut at 250hz. Basically this band affects the body of your sound. BASS : Boost and cut at 60hz. Affects only the bottom end and will be used to account for varying room accoustics.
DIRECT OUT This output will put 500mv into 600 ohms unbalanced. It can be used with a direct box or can be connected directly to the high "Z" input of a mixer.
SPEAKERS Two Speaker jacks are provided on the rear panel and will accept a total load of 4 ohms. Lower impedances should not be used. This unit can drive one four ohm speaker or two eight ohm speakers, maximum. Higher impedances such as eight or sixteen ohms are acceptable. No damage will result from operating the amplifier with the speaker disconnected. POWER SWITCH The power switch and associated pilot light are located in the lower right hand corner of the front panel. FUSE Located on the rear panel, never operate this amplifier with any

Specifications

Normal Gain Sensitivity 2mv rms Max Level 1V rms Impedance 1M ohm -10dB Gain Sensitivity 6mv rms Max Level 3V rms Impedance 1M ohm Effects Send Level 1.5Vrms (boost off) Load Impedance 100k ohm min Effects Return Level 1.5Vrms (boost off) Impedance 40k ohm Direct Level 500mVrms Impedance Min 600 ohm
Speakers Max 8 ohm 2 max 4 ohm 1 max Power 8 ohm 125w 4 ohm 200w Boost Preset Shipping Weight Dimensions Switch to ground 14 lbs. 3''height x 17'' width x 9 '' depth
GALLIEN-KRUEGER 2240 PARAGON DR. SAN JOSE, CA 95131 US: (408) 441-7970 FAX (408) 441-8085 EUROPE: 41.42.234520 FAX: 41.42.239525