Allen&Heath 21 Series User Manual
Page 5
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GENERAL
All Outputs:
Normal Operating Level = +4dBv
Maximum Output Level = +2ldBv 20Hz to 20kHz
Output Impedance = 30ohms
all outputs are protected against damage from accidental short
circuits.
Maximum Gain From Channel Input to Stereo Output: = +70dB
Frequency Response:
Channel Input to Stereo Output = 30Hz to 30kHz +/-1dB
Equaliser Characteristics:
HF = 15dB continuously variable at 10kHz
MID = +/-13dB continuously variable at any frequency between 400Hz
and 6kHz.
Q factor =
1.4
LF = +/-15dB continuously variable at 100Hz
Total Harmonic Distortion:
Channel Input to Stereo Output typically 0.05% THD
Noise:
20Hz to 20kHz MEASURED AT STEREO OUTPUT.
Figures quoted are RMS
noise referred to system operating level.
Microphone Equivalent Input Noise = -125.5dBv
Output with Master Faders Closed = -94dB ref 0VU
Output with Master Faders Raised, All Inputs Closed better than
-66dB ref 0VU
DIN RMS
621 . . . -68dBm
1221
. . . -66dBm
1821
. . . -63dBm
Output with One Input Raised, mic source = 200ohms, EQ flat, gain
minimum =
-61dB ref 0VU
Crosstalk:
Stereo Separation -
better than 56dB at 100Hz
better than 75dB at
1kHz
better than 66dB at
1OkHz