Digital Telephone Voice Recording Interfaces
Analogue Audio/Telephone Recording Interfaces
Covert Audio/Video Security System
Audio System / Dealer Board Interface Analogue Telephone Signalling Converters

COVERT AUDIO RECORDING MICROPHONE (CM2) ACL have developed the CM2 Covert Microphone with unique recording characteristics. It requires NO additional preamp equipment, it will work straight into the front end of any communications recorder or via structured cable system.

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The CM2 can be fixed inside a false wall, false ceiling or inside trunking and cat 5 connection boxes is designed to be as innocuous as possible.
The integrated preamplifier with line driver can be up to 5m away.
The response of the microphone has been tailored for conversation recording using sophisticated audio processing.
The microphone element is a max planar type with superior clarity and noise figure.
Noise gating with adjustable threshold suppresses background noise and music in pick up area.
Signal peak limiter to prevent overload of output stage and recorder.
Adjustable output gain.


Nearfield (<1m distance) to whole room operation: will clearly pick up conversations in rooms of up to 50 cubic metres volume.
Switchable low frequency filter with180Hz / 240Hz / 300Hz centre frequencies removes or attenuates hum or rumble outside speech band.
Sound access hole 1.5mm
Line output range 300 metres

Selectable analogue compression
1:1 no compression
2:1 mild compression
3:1 strong compression.

Balanced or unbalanced output
(Max +18dBu bal, +12dBu unbal).

Power 12V DC Regulated 25mA.
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