Allen & Heath AH-M-AHM-AEC-A Acoustic Echo Cancellation (AEC) module for  AHM-64,12 channels of AEC, 150ms FIR  Adaptive Filter, Far-end AGC, Residual echo  NLP
Acoustic Echo Cancellation for AHM-64

The Acoustic Echo Cancellation (AEC) module for AHM-64 provides 12 channels of AEC and is designed for teleconferencing and videoconferencing scenarios.

The AEC processors are assigned using channel inserts in the AHM-64. One insert sits in the far-end Input channel, and the other in the near-end Input channel.

A Sound Reinforcement output is also provided for cases where local voice reinforcement is required.

Features

• AEC (Acoustic Echo Cancelling) module for AHM-64
• 12 channels of AEC
• 150ms FIR Adaptive Filter
• Far-end AGC (Automatic Gain Control)
• Residual echo NLP (non-linear processing)
• Background noise reduction
• Near-end gating
• Speech-shaped comfort noise

INPUTS

• Mic/Line Inputs Balanced, +48V phantom power
• Mic/Line Preamp Fully recallable
• Input Sensitivity -60 to +15dBu
• Analogue Gain +5 to +60dB, 1dB steps
• Pad -20dB Active PAD
• Maximum Input Level +30dBu (PAD in)
• Input Impedance  >3kΩ (Pad out), >8kΩ (Pad in)
• Mic EIN -127dB with 150? source

OUTPUTS

• Analogue Outputs Balanced, Relay protected
• Output Impedance <75Ω
• Nominal Output +4dBu = 0dB meter reading
• Maximum Output Level +22dBu
• Residual Output Noise 
• -94dBu (muted, 20-20kHz) 
• -92dBu (muted, 20-40kHz)

SYSTEM

Measured balanced XLR in to XLR out, 20-20kHz, +5dB Gain, Pad out, signal @ 0dB (meter)

• Dynamic Range 110dB
• System Signal to Noise -94dB
• Frequency Response 20Hz - 25kHz +0/-0.8dB
• THD+N (analogue in to out) 0.005% @ +16dBu output, 1kHz +5dB gain
• Headroom +18dB
• Sampling Rate 96kHz +/- 20 PPM
• Playback
• Internal Storage ~3GB
• File types Mono/stereo .WAV (16/24bit, 44.1/48/96kHz), MP3, FLAC
• Operating Temperature Range 0 deg C to 40 deg C (32 deg F to 104 deg F)
• Mains Power 100-240V AC, 50-60Hz, 70W max
• DC Power 12VDC - 5A minimum capable supply

DIMENSIONS AND WEIGHTS

Width x Depth x Height x Weight

• AHM-64 482.6mm x 364mm x 91.2mm (19” x 14.3” x 3.6”) x 7kg (15.5lbs)
• AHM-64 Boxed 600 x 500 x 180 mm (23.6” x 19.7”x 7.1”) x 9.5kg (21lbs)