Number of Inputs	Four (4) acoustic echo cancellation.
Connectors	3.81 mm terminal blocks.
Nominal Input Level	+4 dBu with 20 dB of headroom.
Maximum Input Level	+23 dBu
Mic Pre-amp Gain	0, 11.8, 24, 44 or 54 dB switchable with ± 24 dB trim.
Mic Pre-amp EIN	<-127 dB with 150 Ohm source impedance.
CMRR	> 76 dB @ 1 kHz, unity gain.
Input Impedance	8k Ohms balanced, 4k Ohms unbalanced.
Phantom Power	+20 VDC @ 10 mA maximum.
A/D Dynamic Range	< 115 dB, A-weighted.
A/D Latency	0.28 mS (direct), 11 mS (AEC enabled).
A/D THD + Noise	<-94 dB, unweighted.
Tail Length	> 250 mS
Convergence Time	> 100 dB/S

Shipping Weight	1 lbs. (0.45 kg)
Certifications or Compliance	EN 55103-1, EN 55103-2, FCC Part 15, RoHS.