Peavey KB/A 100 User's Manual
Contents
1. ENGLISH GROUNDLAT PONER la KEB5 A Thank you for selecting the KB A 100 keyboard acoustic amplification system Once again Peavey engi neers have listened to input from keyboard players and put together a system that combines excellent features and sound in a portable stylish package The new KB A series amplifiers also deliver awesome sound for drum machines and acoustic instruments From thundering bass to crystal highs it s all there For the full scoop check out the features below FRONT PANEL FEATURES CHANNEL ONE LOW Z INPUT 1 For use with low impedance microphones or low level sources equipped with a male XLR connector HIGH Z INPUT 2 For use with high impedance microphones or high level sources equipped with a Y phone plug MIC LEVEL 3 Controls the microphone s input level CHANNEL TWO HIGH Z INPUT 4 A phone jack input is provided with extremely wide dynamic range This input will accept very high level signals generated by synthesized keyboard systems or very low signals generated by practice or home keyboard units This input is also for acoustic guitars and can be muted with a footswitch optional GAIN SWITCH 5 Boosts the gain of its channel by 12 dB Depress to the in position to activate LEVEL 6 Controls the Channel Two Y phone jack input level CHANNEL THREE HIGH Z INPUT 7 AY phone jack input is provided with extremely wide dynamic range2. This input will accept very high level signals generated by synthesized keyboard systems or very low signals generated by practice or home keyboard units GAIN SWITCH 8 Boosts the gain of its channel by 12 dB Depress to the in position to activate LEVEL 9 Controls the Channel Three Y phone jack input level PRE EQ PATCH SEND RETURN JACK 10 A stereo out in jack allows the uses of various auxiliary units chorus flanging tape digital analog delays equalizers etc in line before the Equalization section To utilize this system a stereo plug tip ring sleeve to a Y cord must be used The tip portion of the Y stereo jack serves as the signal send output while the ring portion will return the processed signal to the system The sleeve portion serves as the ground The Pre EQ patch affects all three channels Since this is a stereo jack configuration the first click on the jack may be used as a Pre EQ output with a mono Y plug if desired This first click will not disturb the signal flow to the remainder of the system as it is fed into the EQ section Note IF THE SECOND CLICK OF THE OUT IN JACK IS UTILIZED WITHOUT RETURNING ANY SIGNAL TO THE SYSTEM FROM AN EFFECTS DEVICE THE REMAINING PREAMP FUNCTIONS WILL BE DISABLED EQUALIZATION LOW EQ 11 y An active tone control Shelving type 15 dB that varies the low frequency range Caution Excessive low frequency boost causes greater power consumption a
3. RMS into 8 ohms at 1 THD 70 W RMS into 8 ohms at 5 THD Frequency Response 0 1 dB 20 Hz to 20 kHz at 50 W RMS into 8 ohms Total Harmonic Distortion Less than 0 2 50 mW to 50 W RMS 20 Hz to 10 kHz 8 ohms typically below 0 1 DDT Dynamic Range Greater than 20 dB DDT Maximum THD Below 0 5 THD for 6 dB overload Below 1 THD for 20 dB overload Hum amp Noise Greater than 90 dB below rated power Power Consumption 200 W at 120 V AC 50 60 Hz Domestic 200 W at 220 230 240 V AC 60 Hz Export Dimensions amp Weight 25 25 H x 21 W x 12 125 D 57 10 Ibs A Due to our efforts for constant improvements features and specifications listed herein are subject to change without notice 6 Flowchart CHANNEL 4 CH 1 LEVEL LOW Z INPUT CH 2 MUTE CHANNEL 4 4 BAND EQ HIGH Z INPUT _ CH 2 LEVELICH 2 GAIN fis al REVERB SWITCH CHANNEL 2 HIGH Z INPUT CH 3 LEVEL CH 3 GAIN CHANNEL 3 HIGH Z INPUT PREAMP POWER AMP ENpuT PREAMP A This flowchart illustrates signal flow within the unit In order to thoroughly understand the unit s functions please study this diagram carefully
4. ee BACK PANEL FEATURES LINE CORD 120 V products only 19 For your safety we have incorporated a 3 wire line mains cable with proper grounding facilities A It is not advisable to remove the ground pin under any circumstances If it is necessary to use the equipment without proper grounding facilities suitable grounding adapters should be used Less noise and greatly reduced shock hazard exists when the unit is operated with the proper grounded receptacies HEADPHONE JACK 20 A stereo jack is provided in order to allow the signal to flow to each side of any stereo headset When a stereo headset is plugged in the internal speaker is automatically turned off so that a totally private re hearsal situation can be accomplished Note The headphone system will not work with headsets that have a mono phone plug PREAMP OUT POWER AMP IN JACKS 21 These jacks are provided for in line patching of effects devices To patch an effects unit connect the Preamp Output to the input of the device Next connect the output of the device to the Power Amp Input high quality shielded cables must be used for these connections The Preamp Output can also be used to route the amplified signal to a mixing console tape recorder etc Connect the Preamp Output using a shielded cable to an input of the tape recorder mixer etc This patch does not affect the operation of the amplifier Note The preamp output level is approximately 1 volt RMS and is
5. nd increases possibility of speaker damage LOW MID EQ 12 An active tone control Peak notch 12 dB that varies the low mid frequency range HIGH MID EQ 13 An active tone control Peak notch 12 dB that varies the high mid frequency range HIGH EQ 14 An active tone control Shelving type 15 dB that varies the high frequency range MASTER MAIN REVERB 15 The Main Reverb control determines the desired amount of reverberation from the internal reverb system Clockwise rotation increases the reverb effect and counterclockwise decreases the effect POWER LED 16 Illuminates red when AC power is being supplied to the amp GROUND SWITCH 17 Three position rocker type switch which in most applications should be operated in its center or zero position There may be some situations when audible hum and or noise will come from the loudspeaker If this situation arises position the ground switch to either positive or negative or or until the noise is minimized Note Should the noise porblem continue consult your Authorized Peavey Dealer the Peavey factory or a qualified service technician THE GROUND SWITCH IS NOT FUNCTIONAL ON 220 240 VOLT MODELS POWER SWITCH 18 Depress the switch to the on position The red LED will illuminate indicating power is being supplied to the unit Back Panel a KB A 100 A PRODUCT OF PEAVEY ELECTRONICS CORP KEYDOARD ATOUSTIC MERIDIAN MS MADE IN U S A iisa c
6. of relatively low impedance 600 ohms Any effects device used in this effects loop must be capable of receiving 1 volt input and providing 1 volt output in order to properly drive the power amp The Power Amp Input has an internal switch which discon nects the internal preamp REVERB SWITCH JACK 22 For connection of a footswitch optional and is used to activate defeat reverb CHANNEL TWO MUTE 23 For connection of a footswitch optional and is used to activate defeat the mute on Channel Two SPECIFICATIONS PREAMP SECTION The following preamp specs are measured at 1 kHz with the master EQ set flat at O dB all gain switches in the out position the main reverb at 0 nominal signal levels are with channel level controls set at 5 minimum level are with channel level controls set at 10 Channel One Inputs Low Z Input Impedance 3 3 K ohms Nominal Input Level 30 dBV 32 mV RMS Minimum Input Level 40 dBV 10 mV RMS High Z Input impedance 100 K ohms Nominal input Level 10 dBV 316 mV RMS Minimum Input Level 20 dBV 100 mV RMS Channel Two amp Channel Three Input Input Impedance 220 K ohms Nominal input Level 14 dBV 200 mV RMS Minimum Input Level 36 dBV 16 mV RMS Channel Two Mute Greater Than 50 dB Pre EQ Patch stereo jack tip Function Low level effects send Load Impedance 10 K ohms or greater Nominal Output 10 dBV 316 mV RMS Pre EQ Patch stereo jack ring Function Low level effects retu
7. rn Impedance High Z 100 K ohms Input Level 10 dBV 316 mV RMS Switching stereo jack providing patch output to patch input connection when not used Preamp Output Function High level post EQ signal send Load Impedance 1 K ohm or greater Nominal Output 3 dBV 1 4 V RMS Maximum Output 18 dBV 8 V RMS Power Amp Input Function High level post EQ signal return Impedance High Z 22 K ohms Nominal Input 0 dBV 1V RMS Switching jack providing preamp output to power amp input connection when not used Headphone Output stereo jack Load Impedance 4 ohms or greater Nominal Output 100 mw Switching jack which will disconnect internal speaker when headphone plug is inserted Reverb Switch 1 4 phone jack Function Reverb defeat foot switch Channel Two Mute Function Channel two mute foot switch Greater than 50 dB The following specs are measured at nominal setting all phone jack inputs terminated with 47 k ohms Frequency Response Channel input preamp output at 1V RMS level 0 3 dB 60 Hz to 20 kHz System Distortion Channel in preamp out 60 Hz to 20 kHz at 1V RMS Less than 0 05 THD typically below 0 01 Preamp Hum and Noise 85 dBV Channel Equalization 15 dB at 80 Hz and 10 kHz shelving 12 dB at 400 Hz and 2 kHz peak notch POWER AMPLIFIER SECTION Rated Power and Load 64 W RMS into 8 ohms with DDT compression Power at Clipping typically 1 kHz 120 V AC line 65 W
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