Bose FREESPACE 4400, Service Manual

Page: 7 / 107

7
SPECIFICATIONS
Page and Aux/Mic Inputs (continued)
Nominal Limits Conditions
CMRR referred 90 dB >/= 70 dB At 1 kHz, 60 dB gain, from source of nominal
to output: 200 Ohms
Input sensitivity for -60 dBV to +/-1 dB At 1 kHz
codec FS: +17 dBV
Gain, all settings: 20 dB to +/-1 dB 1 kHz, 50 Ohm source
-20 dB
Maximum input level: +17 dBV >/= 10 dBV THD+N </= 0.3%, 20-20 kHz, 0 dB gain
THD+N: .001% .01% At +10 dBV output, 1 kHz, 60 dB gain
Crosstalk at 1 kHz: -90 dB </= -80 dB
Crosstalk at 10 kHz: -70 dB </= -60 dB
Frequency response: 30 Hz to +0/-0.5 dB Reference 1 kHz, measured at 60 dB gain and
20 kHz with 0 dBV output
Sense Mic inputs
Nominal Limits Conditions
Source impedance: 200 Ohms 10 to 2k Ohm Frequency response specification maintained
with sources over this range
Input impedance
differential:
20k Ohm +5% At 1 kHz
Equivalent input noise at 60 dB, at 60 dB, A weighted RMS, 200 Ohm source termination
at INA129 gains of 60 -127 dBV -125 dBV
dB, 40 dB and 20 dB: at 40 dB, at 40 dB,
-115 dBV -112 dBV
at 20 dB, at 20 dB,
-96 dBV -93 dBV
CMRR referred
to output:
90 dB >/= 60 dB At 1 kHz, 60 dB gain, from source of nominal
200 Ohm
Phantom power: +12V +/-1V Open circuit
Input sensitivity for -60 dBV to +/-1 dB At 1 kHz
codec FS: +20 dBV
Gain, all settings: -60 dB to +/-1 dB 1 kHz, 50 Ohm source
+20 dB