15
Technical Specification
Input impedances
Mic: 1.2kohm; Line: 20kohm
Pre-amp overall gain
0dB to 60dB
Common mode rejection
70dB
Equivalent input noise
-128.5dBu (unweighted)
Distortion
0.001%
(below Compressor threshold)
Frequency response
15Hz to 70kHz (-3dB)
Maximum input before clipping
Mic: +21dBu; Line: +45dBu
Headroom before clipping
+21dBu
High Pass Filter
12dB per octave cut below 80Hz
Compressor threshold
-6dBu to +22dBu (variable)
Compressor ratio
1:1 to 10:1 (variable)
Compressor attack time
1 msec to 100 msec (adaptive)
Compressor release time
0.1 sec to 3 sec (adaptive)
EQ Boost and Cut
+/-15dB (zero phase-shift bell response)
LF Frequency
40Hz to 650Hz variable
MID Frequency
300Hz to 5kHz variable
HF Frequency
6kHz or 12kHz selectable
Nominal output levels
+4dBu/-10dBv
Output impedance
75ohm
Output Level switch
12dB attenuation
Noise Floor
-85dBu (typical, with ~40dB mic gain)
VU Meter
Analogue movement
Power supply
115V / 230V ac mains, 50/60Hz
Power consumption
30W
Mechanical
482W x 88H x 220D (overall)
Weight
3 kilos
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Troubleshooting
1) No Power (no lights work)
• Is the power supply plugged in (both ends)?
• Is the mains power on?
• Is the mains voltage set correctly for your region?
• Has the mains fuse blown?
2) The microphone doesn’t work
• Is it connected to the correct (XLR) input on the rear panel?
• If it is a condenser microphone, is the phantom power switched on?
• Is the ‘Line’ switch out (LED off)?
• Is the ‘Input Gain’ control turned up?
• Is the ‘Output Gain’ control turned up?
3) The line input doesn’t work
• Is the source connected to the correct (jack) input on the back of the unit?
• Is the ‘Line’ switch in (LED on)?
• Is the ‘Input Gain’ control turned up?
• Is the ‘Output Gain’ control turned up?
4) The compressor doesn’t work
• Is the ‘Comp’ switch in (LED on)?
• Is the ‘Compress’ control turned up enough?
• Is there enough signal, as set by the ‘Input Gain’ control, to drive the
compressor?
5) Too little or too much compression
• Turn the ‘Input Gain’ control up or down respectively, to adjust the
signal level to the compressor
6) The Meequalizer doesn’t ‘t work.
• Is the ‘EQ’ switch in (LED on)?
• Is ‘Input Gain’ control turned up?
• Is ‘Output Gain’ control turned up?
7) Too much noise
• Is the ‘Input Gain’ control too high? Try moving the mic closer to the
source
• Is the ‘Output Gain’ control too high (eg: when lots of compression is
being used)?
• Is there too much EQ boost?
• Is the noise already present in the input signal? (Try removing the input)
8) Sounds distorted
• Is the ‘Input Gain’ control too high?
• Is the ‘Output Gain’ control too high?
• Is there too much EQ boost?
• When using the compressor, is the Release control set too low?
twin q manual.indd
7/15/04, 9:22 AM
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