By: Lectrosonics
Wireless Microphones & Audio Processors
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Digital Telephone Hybrid

The DMTH4 from Lectrosonics is an 3-input, 24-output matrix mixer, that allows for connecting telephone lines, video codecs, along with other audio sources, into the digital bus structure of DM Series processors. The unit treats the "non-regular" audio sources as if they were microphone or line inputs, with DSP available on both input and output, including filters and compression. Up to 128 macros can be stored in internal memory.

The unit is suitable for sound reinforcement applications, recording in boardrooms, courtrooms, worship centers, distance learning systems and hotels, and wherever teleconferencing is part of the system requirements. It tackles the issue of echo being heard at the originating source (the "far end"), due to the signal from loudspeakers entering microphones at the local room, and being sent back to the "far end" location.

DMTH4 features include:

  • 3-input/24-output digital matrix processor in a stackable configuration
  • Fully integrates with DM Series processors
  • Telephone, codec and auxiliary inputs and outputs
  • Two acoustic echo cancellers - 126 mSec tail time
  • Line echo canceller - 30 mSec tail time
  • Six filters plus compressor on each input
  • Six filters and compressor/limiter on each output
  • USB and RS-232 interfaces for setup and comprehensive remote control
  • Fully balanced audio signal flow throughout entire system
  • Digital I/O ports for "daisy chaining" and to connect other LecNet 2 devices
  • Proportional gain auto mixing algorithm with AutoSkew
  • Simultaneous LecNet2 software and third-party control
Frequency Response 20Hz to 20kHz
Dynamic Range Input: 102dB (unweighted 20Hz to 20kHz)
Output: 105dB (unweighted 20Hz to 20kHz)
Inputs 5-pin Phoenix
Outputs 5-pin Phoenix
Other Connectors 6 x RJ-45 Expansion
2 x RJ-11 jacks
1 x DB-25 Logic I/O
1 x USB
1 x 1/8" TRS Stereo Mini Serial
Input Impedance 10kΩ
Output Impedance 450Ω differential @ 0dB attenuation
5Ω differential @ -40dB attenuation
Maximum Input Level +20dBu
Maximum Output Level +20dBu
Sample Rate 48Khz
Phantom Power No
Crosstalk Line Level -103 dB
Mic Level -101 dB
THD + N 0.02%, nominal input level
Dimensions (WxDxH) 19 x 7.5 x 1.7" (483 x 191 x 43mm)
Weight 3.5 lbs (1.6 kg)
Specialties Integrates telephone lines, video codecs and external audio sources into the digital bus structure of DM Series processors

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Prices and specifications subject to change without notice.