Chord KB-80 User manual

KB-80 Keyboard Amplifier
173.450
User Manual
Features:
80Wrms output
3 input channels
Microphone input option
3-band EQ
Ported 2-way cabinet design

Introduction
Thank you for choosing the KB-80 keyboard amplifier.
The KB-80 is designed for use with up to 3 keyboards and deliver a high quality full range output to the listener.
Channel 1 can act as a microphone input, turning this unit into a versatile compact P.A.
Warning
To prevent the risk of fire or electric shock, do not expose this appliance to rain or moisture. To prevent electric shock do not
remove the cover. No user serviceable parts inside. Refer servicing to qualified service personnel.
Safety
Prior to connecting mains, ensure that the supply voltage is correct and the mains lead is in good condition.
Avoid ingress of water or particles into the enclosure.
If the mains fuse blows, refer the unit to qualified service personnel
Placement
Keep the unit out of direct sunlight and away from heat sources.
Place the unit in an upright position during use and storage.
Keep the unit away from moisture or dusty environments.
Cleaning
Use a soft cloth with a neutral detergent to clean the cabinet, panel and controls. To avoid damage, do not use solvents to clean
this equipment.
Front Panel
1) CH1 LOW Z Input –XLR input suitable for low impedance microphone
2) CH1 line inputs –L (mono) & R 6.3mm jack inputs for keyboards or other line source
3) CH1 LEVEL –Rotary control for channel 1 output level
4) CH2 line inputs –L (mono) & R 6.3mm jack inputs for keyboards or other line source
5) CH2 LEVEL –Rotary control for channel 2 output level
6) CH3 line inputs –L (mono) & R 6.3mm jack inputs for keyboards or other line source
7) CH3 LEVEL –Rotary control for channel 3 output level
8) LOW / MIDDLE / HIGH –3-band EQ for main output tone shaping
9) VOLUME –Master output level control
10) PHONES –6.3mm headphone output

Rear Panel
Operation
Connect the IEC inlet on the KB-80 to the mains using the appropriate IEC lead, ensuring correct voltage and current rating
If a microphone is to be used, connect this to channel 1 via the XLR connector or the L/MONO jack input.
If no microphone is used, channel 1 can be employed as a keyboard input
Connect up to 3 keyboards to the KB-80 via the line input jacks on channels 1 to 3
For stereo keyboards, connect the left and right outputs to the L/MONO and R jack inputs
For mono keyboards, just use the L/MONO jack inputs
If required, connect headphones to the PHONES output (6.3mm stereo jack)
Connect any playback or auxiliary line sources to the rear RCA connectors
The rear LINE OUT jacks may be used to connect the mix output to a PA system.
Set LOW, MIDDLE and TREBLE EQ controls to halfway (12o’clock position)
With the master VOLUME and channel volumes turned fully down, switch the power on
If AUX input is connected, play the signal through the KB-80
Gradually increase the master VOLUME until the required level is reached for AUX input.
Gradually increase channel LEVEL(s) whilst playing the keyboard(s) or using the microphone
Check levels until the required volumes are achieved
Adjust EQ controls to the desired amounts (LOW, MIDDLE and TREBLE frequencies)
If higher master VOLUME is required, it may be necessary to reduce the signal level fed to the AUX input
After use, turn the master VOLUME fully down before powering off.
11) Mains inlet –IEC with fuse holder (ensure correct rating when replacing fuse)
12) POWER –On/Off mains switch
13) LINE OUT –L (mono) & R 6.3mm jack outputs to send to PA or further amplifier
14) AUX IN –L+R auxiliary line input on RCA connectors

SPECIFICATIONS
Power supply
220-240Vac 50Hz (IEC)
Inputs
1 x Mic or stereo line, 2 x stereo line
Outputs
L+R line output, Headphones out (stereo)
Controls
Channel Volumes, Bass, Middle, Treble, Volume
Speaker drivers
12“ woofer + 3“ tweeter
Output power: RMS
80W
Dimensions
470 x 525 x 340 mm
Weight
23kg
Troubleshooting
No output and no Power light
Check POWER switch is on and mains lead is connected properly
Check mains fuse hasn’t blown
Power LED is lit but no Output
Check that Master VOLUME and Channel LEVEL controls are not turned down fully
Check that headphones are not left plugged in
Change jack lead to check if faulty (also RCA lead for AUX input)
Check that all EQ controls are not turned fully down
Output too distorted
Check that high impedance line input is not fed to the XLR on channel 1
Reduce volume on keyboard
Reduce Channel LEVEL controls and Master VOLUME control if necessary
Reduce EQ controls if turned up above halfway
Output very quiet
Check output volume on keyboard(s) and increase if necessary
Ensure low impedance inputs (e.g. microphone) are not fed to jack line inputs
Increase master VOLUME and/or channel LEVEL controls
Check that all EQ controls are not turned down
© Chord 2011