ENGLISH
13
Specifications
Mic Input Response
• Gain range = 0dB to 60dB in 10dB steps.
• Input Impedance, variable as follows:-
Switched Impedance
setting
Equivalent Input Impedance at
1KHz
Low 600Ω
ISA110 1400Ω
Med (Medium) 2400Ω
High 6800Ω
• EIN (equivalent input noise) = -128dB measured at
60dB of gain with 150 Ohm terminating impedance and
20Hz/22kHz bandpass filter.
• Noise at main output with gain at unity (0dB) = -97dBu
measured with a 20Hz/22kHz bandpass filter.
• Signal to noise ratio relative to max headroom (28dBu)
= 125dB
• Signal to noise ratio relative to 0dBfs (+22dBu) = 119dB
• THD at medium gain (30dB) = 0.001% measured with a
1KHz -20dBu input signal and with a 20Hz/22kHz
bandpass filter.
• Frequency response at minimum gain (0dB) = -0.25dB
down at 20Hz and –3dB down at 120kHz.
• Frequency response at maximum gain (60dB) = –2.5dB
down at 20Hz and –3dB down 120kHz.
• CMRR at full gain (60dB) = 80dB. (check 220 figure)
Line Input Response
• Gain range = -20dB to +10dB in 10dB steps.
• Input Impedance = 10kΩ from 10Hz to 200kHz.
• Noise at main output with gain at unity (0dB) = -91dBu
measured with a 20Hz/22kHz bandpass filter.
• Signal to noise ratio relative to max headroom (28dBu)
= 119dB
• Signal to noise ratio relative to 0dBfs (+22dBu) = 113dB
• THD at unity gain (0dB) = .002% measured with +4dBu
input signal and with a 20Hz/22kHz bandpass filter.
• Frequency Response at unity gain (0dB) = 0.25dB down
at 20Hz and –3dB down at 140kHz.
Instrument Input Response
• Gain range = 10dB to 40dB continuously variable
• Input Impedance = >1Meg Ohm.
• Noise at minimum gain (0dB) = -90dBu measured with
a 20Hz/22kHz bandpass filter.
• Noise at maximum gain (40dB) = -78dBu measured
with a 20Hz/22kHz bandpass filter.
• THD at minimum gain (0dB) = .006% measured with
–10dBu input signal and with a 20Hz/22kHz bandpass
filter.
• Frequency Response at 10dB gain = 0.2dB down at
26Hz and 0dB at 32kHz.
• Frequency Response at 40dB gain = -3dB down at 26Hz
and –3dB down at 32kHz.
High Pass Filter
• Roll off = 18dB per octave 3 pole filter
• Frequency Range = continuously variable from 16Hz to
420Hz measured at the 3dB down point.
Input Meter
• Calibrated for 0dBfs = +22dBu and indicates the level
after the High Pass Filter and before the Insert Send
output.
• O/L LED = is lit when signal level reaches a level
greater than 0dBfs.
Soft Limiter
• Threshold = -6dBfs (+16dBu)
• Limiter ratio is level dependent as follows:-
Signal Level Input to Output Level Reduction Ratio
-6dBfs to –4dBfs Infinite:1
-4dBfs to 0dBfs 2:1
0dBfs to +6dBfs 1.5:1
• Attack time = instant
• Release time = instant
• Noise = -95dBu measured with a 20Hz/22kHz bandpass
filter.
ADC Meter
• 6 LED meter is calibrated relative to 0dBfs where 0dBfs
= +22dBu (the maximum level which can be correctly
converted by the optional internal A/D converter
before overload occurs). The meter calibration points
are as follows:
Meter panel calibration
value in dBfs
Equivalent dBu value
0dBfs +22dBu (the maximum level
into the converter)
-2dBfs +20dBu
-6dBfs +16dBu
-12dBfs +10dBu
-18dBfs +4dBu
(the average level to allow
20dB of headroom for EQ and
dynamics processing).
-42dBfs -20dBu
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