Polycom 2457-23216-002 User Manual
Integrator’s Reference Manual for the Polycom RealPresence Group Series
250
Polycom, Inc.
Audio Specifications for Polycom RealPresence Group 700 systems
Dynamic Range
Either analog audio input routed to
Either analog audio input routed to
Main Output:
Any digital audio input routed to any
Any digital audio input routed to any
digital output:
>85 dB, A-weighted
>95 dB, A-weighted
Crosstalk and Feed-Through
Any input or output channel to any other
channel
channel
≤80 dB, 20 Hz to 20 kHz
Frequency Response
Any input to any output,
Relative to 997
Hz
+1, 3 dB, 50 Hz to 20 kHz
Total Harmonic Distortion + Noise vs.
Frequency
-1 dBFS Input Level
-20 dBFS Input Level
-1 dBFS Input Level
-20 dBFS Input Level
1 dBFS input level
20 dBFS input level
20 dBFS input level
60 dB, 50 Hz to 20 kHz
65 dB, 50 Hz to 20 kHz
95 dB, 50 Hz to 20 kHz
75 dB, 50 Hz to 20 kHz
65 dB, 50 Hz to 20 kHz
95 dB, 50 Hz to 20 kHz
75 dB, 50 Hz to 20 kHz
Characteristic
Value
Characteristic
Value
Maximum Input Level
0 dBFS, Analog Inputs
0 dBFS for Line Inputs
0 dBV (1.0 V
RMS
), 1 dB
+6 dBV (2.0 V
RMS
), 1 dB
Input Impedance
Analog Inputs
Analog Inputs
20k, 5%
Maximum Output Level
Line Output (≥600 load):
6 dBV (2.0 V
RMS
), 1 dB
Output Impedance
Line Output
Line Output
150 , 5%
Signal-to-Noise Ratio
Any analog audio input routed to the
analog output
analog output
Any digital audio input routed to any
digital output:
>90 dB,
>95 dB, A-weighted