KB-Series
Item ref: 173.450UK, 173.451UK
Keyboard Amplifiers
User Manual
Introduction
KB-80
KB-40
Power supply
220-240Vac 50Hz (IEC)
Inputs
1 x Mic or stereo line, 2 x stereo line
AUX input
L+R RCA
N/A
EQ controls
Bass, Middle, Treble
Bass, Treble
Outputs
L+R line output, Headphones out
Power: RMS
80W
40W
Speaker drivers
300mm + 75mm tweeter
200mm + 65mm tweeter
Dimensions
470 x 525 x 340 mm
395 x 395 x 300mm
Weight
23.0kg
12.0kg
Thank you for choosing this KB-series keyboard amplifier.
These amplifiers are 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.
Specifications
173.450UK, 173.451UK User Manual
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. BASS, MIDDLE (KB-80), TREBLE – Global EQ for tone shaping
9. PHONES – 6.3mm headphone output
10. VOLUME – Master output level control
Rear Panel
11. POWER – Mains On/Off rocker switch
12. IEC – Mains inlet
13. Left or Mono 6.3mm line output
14. Right 6.3mm line output
15. L+R RCA Aux input (KB-80)
173.450UK, 173.451UK User Manual
Operation
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 via XLR
Reduce volume on keyboard
Reduce Channel LEVEL controls and Master VOLUME control
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
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 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)
On the KB-80, a playback or auxiliary line source maybe connected via the rear RCA inputs
The rear LINE OUT jacks may be used to connect the mix output to a PA system.
Set BASS, MIDDLE (KB-80) and TREBLE EQ controls to halfway (12 o’clock position)
With master VOLUME (KB-80) and channel volumes turned fully down, switch the power on
If a playback source is connected to the KB-80 RCA inputs, ensure it is set to “PLAY”
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 (BASS, MIDDLE and TREBLE frequencies)
If higher master VOLUME is required, it may be necessary to reduce the signal level fed to the
AUX input on the KB-80
After use, turn the master and channel volume controls fully down before powering off.
Troubleshooting
Errors and omissions excepted.
Copyright© 2012. AVSL Group Ltd.
173.450UK, 173.451UK User Manual
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