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Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12
Thermal
• Thermal Dissipation (Btu/hr): 266 Btu/hr (C16), 230 Btu/hr (C12), 215
Btu/hr (SR12), 200 Btu/hr (C8)
• Operating temperature 0 - 40° C (104° F)
Inputs
• Phantom power: 48 V DC through 6.8 kOhm series resistor per leg, 7.5 mA
per channel, software selectable
• Analog input gain: -20 to 64 dB on all inputs in 0.5 dB steps, software
adjustable
• Maximum input amplitude: +20.4 dBu, 1% THD + N
• Nominal level: 0 dBu (0.775 Vrms)
• 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 dB 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, -60 dB FS, 997
Hz input signal, 0 dB gain
• Dynamic range: >109 dB FS no weighting, 20 - 20,000 Hz, -60 dB FS, 997
Hz input signal, 0 dB gain
• Linearity: 0 dB FS to -122 dB FS +/- 1 dB
Warning
Unless noted, all values are valid for all channels at 0 dB input gain.