Polycom SoundStructure
Models C16, C12 and C8
Specifications

Dimensions
19” (483 mm) W x 13.5” (343 mm) L x 1.75” (45 mm) H (one rack unit)

Weight
12 lbs. (5.5 kg) dry, 14 lbs. (6.4 kg) shipping

Connectors
RS-232: DB9F
OBAM In/Out: IEEE 1394B
CLINK2 : RJ45
LAN: RJ45
Control /Status: DB25F
Audio: Mini (3.5mm) quick connect terminal blocks
IR Receive: Mini (3.5mm) quick connect terminal block

Power and Thermal
Internal supply
Input voltage of 90-250 VAC; 50-60
Hz; line power requirements (including 0.6 PF): 130VA (C16), 115VA (C12), 95VA (C8)
Thermal dissipation (Btu/hr): 266 Btu/hr
(SoundStructure C16), 230Btu/hr
(C12), 200 Btu/hr (C8)
0 to 40°C operating temperature

Inputs
Phantom power: 48 V DC through 6.8kOhm series resistor per leg, 7.5mA per channel, software selectable
Analog input Gain: -20 to 64 dB on all inputs in 0.5 dB steps, software adjustable
Maximum input amplitude: +20.4dBu, 1% THD + N
Nominal level: 0 dBu (0.775V rms)
Equivalent input noise: <-122 dBu, 20 - 20,000 Hz, Rs=150 Ohms (1%)
Input Impedance: 10 kOhms
Input EMI Filter: Pi filter on all audio inputs

Outputs
Output Gain: -100 to 20 dBu in 1 dB steps, software adjustable
Maximum output amplitude: +23 dBu, 1% THD + N
Nominal output level: 0 dBu (0.775 Vrms)
Output impedance: 50 Ohm, each leg to ground, designed to drive loads >600 Ohms
Output EMI Filter: Pi filter on all audio outputs

System*
Frequency response: 20-22,000 Hz, +0.1 /- 0.3 dB
Idle channel noise: <-109 dB FS no weighting, 20 -20,000 Hz, -60dB FS, 0.997 kHz input signal, 0 dB gain
Dynamic range: >109 dB FS no weighting, 20 - 20,000 Hz, -60 dB FS, 0.997 kHz input signal, 0 dB gain
Linearity: 0 dB FS to -122 dB FS +/- 1 dB THD+N: < 0.005%, -20 dB FS input signal
Common Mode Rejection Ratio: <-61 dB, 20 - 20,000 Hz, no weighting
Cross talk: <-110 dB, 20-20,000 Hz, 1kHz, channel-to-channel
Latency: Mic/Line inputs to outputs: 20 ms, AEC and NC processing enabled
Acoustic Echo Cancellation Span: 200ms
Total Cancellation: >65 dB
Convergence Rate: 40 dB/second
Noise cancellation: 0-20 dB, software selectable
Control Inputs: Contact closure
Status Outputs: Open collector 60V and 500mA maximum per output
All signal ground pins connected to chassis ground through low impedance planes
*Unless noted, all values are valid for all channels at 0dB input gain

Optional Telco Cards
Input gain: -100 to +20 dB in 1 dB steps, software adjustable
Nominal transmit level: 0 dBu in SoundStructure yields -15 to -17 dBm to phone (country code dependent)
Nominal receive level: -15 to -17 dBm from phone yields 0 dBu output (country code dependent)
Off hook loop current: 10 mA (minimum) to 120 mA (maximum)
Output gain: -100 to +20 dB in 1 dB steps, software adjustable
Frequency response: 250-3300 Hz
Dynamic range: >70 dB FS, 250-3300 Hz, "A" weighted