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Comrex DH20 - Digital Hybrid

Are you looking for the very best, most affordable digital telephone hybrid available? You just found it. The DH20 Digital Hybrid incorporates the latest in DSP technology to provide you with the best sound and easiest installation.
The DH20 is a high quality single line telephone interface that interconnects a standard telephone line and your audio equipment, allowing you the ability to send audio to and receive audio from a connected telephone line. The DH20 is ideal when the very best audio quality is required for talk shows, news feeds, production, recording studios, and internet applications.

Our newest DSP technology delivers better and more reliable sound quality. The DH20 delivers the deepest and most stable hybrid null, ensuring maximum isolation between the send and caller audio. That mean no echo and no "bottom of the barrel" sound.
 

In addition, we've added selectable automatic gain control (AGC) and caller ducking. With AGC, each call will be delivered to your equipment at the same level. Caller ducking reduces the caller's audio level when the announcer speaks, providing a more "controlled" environment. We've also added a speaker amplifier so you can connect a speaker directly to the unit and monitor callers without headphones.
Specifications
Connections: Remote: DB25 Female














Monitor Output: 1/4" stereo jack


Send Input: XLR female



Caller Output: XLR male

Aux Output: XLR male


Telco Line: RJ11 connector




Telco Set: RJ11 connector

Telephone Transmit





Telephone Receive		 Remote Send Input:
0dBu nominal, adjustable,
unbalanced, 20k½ impedance
Remote Caller and Aux Output:
0dBu nominal, adjustable,
unbalanced, 50½ impedance
Control Inputs:
Remotely activate any of the following functions with a switch closure to ground: On, Off, and Monitor Mute
Status Outputs: Remotely check the status of the hybrid using the On and Off status outputs. Status outputs are open collector outputs rated at 30VDC and 40mA maximum

Tip=+phase, Ring=ground,
Sleeve=ground, 1W output into an 8½ load

Mic/Line selectable, -55/0dBu nominal,
adjustable, balanced, bridging,
20k½ impedance
0dBu nominal, adjustable, balanced, 50½ impedance

0dBu nominal, adjustable, balanced, 50½ impedance

POTS (plain old telephone service) line or analog extension from a PBX or dry line (no DC offset voltage).
A-Lead supervision provided

A-Lead supervision provided

Nominal send input of 0dBu referenced to -15dBu onto the telephone line.
Frequency Response: 250Hz to 3.5kHz, ±1dB
Signal to noise ratio: >56dB
Distortion: <0.2%

Nominal telephone line level of -15dBu referenced to caller output of 0dBu
Frequency Response: 250Hz to 3.5kHz, ±1dB
Signal to noise ratio: >56dB
Distortion: <0.2%
Functions: Controls


Status LEDS



Adjustments

 
On/Off Buttons
Volume Up/Down Buttons

On Status, Off Status
Send Audio Presence
Caller Audio Presence

Send Input Level
Caller Output Level
Auxiliary Input Level
Auxiliary Output Level
Burst Adapt Select
Mic/Line Select
Caller Boost Select
Momentary/Latching Select
Auto Answer/Disconnect Select
Caller Control Select (0, 6, 12, or 18dB)
AGC Select
Auto Mix-Minus Select
Aux Mix Select
Power: Power: IEC Type Auto Adjusting 100-240VAC, 2A, 50/60Hz, 30W

Physical:

 Dimensions (LxDxH)


Weight		 17.125" x 10.125" x 1.75"
43.6 x 25.7 x 4.44 cm

6.35 lb/2.88 kg (dry)
10.95 lb/4.97 kg (shipping)
FAQ's

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