Chord 173.442 User manual

CB Series Bass Amplifiers
User Manual
173.442, 173.443, 173.444, 173.445
Features:
Angled baffle for projection
Multi-band equalisation
Ported cabinet
Switchable compression (CB-100/CB-200)
High power output

Introduction
Thank you for choosing our CB series bass amplifier. Please read this manual prior to use to avoid damage to the item.
The CB range is specifically designed to give the bass player a powerful, dependable amplifier with enough useful features to
suit a wide variety of situations from rehearsal to stage.
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) Input –6.3mm jack (unbalanced)
2) Gain control –Turning clockwise boosts input and increases drive
3) Shape –Pre-EQ tone contouring
4) EQ section –Switchable 7-band graphic or 4-band rotary (CB-25) tone adjustment
5) Compression –Turning clockwise increases sustain and reduces attack peaks
6) Master –Turning clockwise increases output level to power section with on/off switch
7) Phones –6.3mm jack output to drive headphones
8) MP3 in –3.5mm jack socket to plug in a line input to play along with.
9) Power –Illuminated mains switch

Rear Panel
Specifications
CB-200
CB-100
CB-50
CB-25
Power supply
220-250Vac, 50/60Hz (IEC)
Output power @ 8Ω
200Wrms
100Wrms
50Wrms
25Wrms
Speaker unit(s)
15" HD main + piezo HF unit
12" HD main + piezo HF unit
10” HD driver
8" HD driver
Input
Active + Passive 6.3mm jack
Active + Passive 6.3mm jack
Active + Passive 6.3mm jack
6.3mm jack
Send/Return Loop
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Ext Speaker Out (8Ω min)
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D.I. Output (XLRM)
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Phones Out (6.3mm TRS jack)
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MP3 in (3.5mm TRS jack)
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Preamp Controls
Gain, Shape, Master
Gain, Master
Gain, Master
Gain, Master
Equalisation
7-band Graphic EQ
7-band Graphic EQ
7-band Graphic EQ
4-band EQ
Switchable Compressor
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Dimensions
530 x 630 x 420mm
470 x 525 x 340mm
425 x 455 x 320mm
365 X 395 X 300mm
Weight
26kg
23kg
16kg
12kg
10) Mains inlet –IEC with fuse holder (ensure correct rating when replacing fuse)
11) Speaker connections –Internal and external speaker 6.6mm jack outputs (4Ω min)
12) Balanced Out –Direct Inject output for mixer or recording device (XLRM balanced)
13) Send & Return –6.3mm jack output and input loop to patch in external effects units

Operation
Connect the bass guitar to the CB-series bass amplifier input using a good quality 6.3mm mono jack lead, noting that
basses with internal active preamps should be connected to the “Active” input and those without should be connected to
the “Passive” input
For CB-100 and CB-200, if the output is to be fed to a mixing console or recording device, the best method is to use the
rear panel Balanced Out XLRM connector. Connecting this gives a clean line level to the mixer or recorder without the need
for a separate D.I. box and all Gain, EQ and Compression settings are included.
For CB-100 and CB-200, ensure that the internal speaker (and external speaker, if used) is plugged in at the rear
Connect the amplifier to the mains using the appropriate mains IEC lead supplied
If any external effects are to be used in the effects loop, connect the Send/Return jacks to the input/output of the unit(s) and
power up ready for use
Set all shape and EQ controls to the mid-way position and switch off compression (if any)
With the Master volume turned down, switch on the power switch and gradually increase the Master volume to the required
level
Increase Gain and play a note, ensuring that the bass guitar’s volume and tone controls are turned up. Continue increasing
Gain until the required signal level and drive amount are achieved
For the CB-200, altering the Shape rotary gives an overall tone control independent of the graphic EQ
For models with a 7-band graphic EQ, switching on activates the circuit allowing accurate control over the tonal
characteristics by boosting or cutting frequency bands on the 7 sliders. CB-25 has permanent 4-band EQ
For models with Compression, switching on and turning this control up will “squeeze” the dynamic range causing the attack
of a plucked string to be de-emphasised whilst increasing note sustain
Plugging in a pair of headphones to the 6.3mm TRS Phones jack will allow silent practice by muting the speaker output.
For the CB-25, plugging a personal stereo playback device (like an mp3 player) into the MP3 mini-jack input allows the
music to be mixed in with the bass guitar sound for “play-along” practice.
Before switching off or removing power, turn down the Master volume control.
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 lit but no Output
Check that Gain, EQ, Master and bass guitar controls are not turned down fully
Check Speaker Outs are connected to the relevant speakers
Check that headphones are not left plugged in
Change jack lead to check if faulty, also for Send and Return jacks
Check battery is OK in active bass or effects units in the Send/Return loop
Output too distorted
Make sure Active bass is not plugged into Passive input
Reduce Gain & EQ controls and increase Master volume to compensate
Adjust compression effect to combat heavy string attack
Output very quiet
Check that Gain, EQ, Master and bass guitar controls are not turned down
Make sure passive bass is not plugged into Active input
Unplug effects from Send/Return loop to check if they are cutting signal level
© Chord 2011