Comrex DH22
Digital Hybrid Dual Line Telephone Interface


Are you looking for the very best, most affordable dual digital telephone hybrid available? You just found it.
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Our Price: $1,593.41
List Price: $1,595.00
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Comrex DH22
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Are you looking for the very best, most affordable dual digital telephone hybrid available? You just found it. The DH22 Dual Digital Hybrid incorporates the latest in DSP technology to provide you with the best sound and easiest installation.

The DH22 is a high quality dual line telephone interface that interconnects two standard telephone lines and your audio equipment, allowing you the ability to send audio to and receive audio from the connected telephone lines. The DH22 is ideal when the very best audio quality and conferencing capabilities are required in talk shows, news feeds, production, recording studios, and Internet applications.

Our newest DSP technology delivers better and more reliable sound quality. The DH22 delivers the deepest and most stable hybrid null, ensuring maximum isolation between the send and caller audio. That means 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.

Comrex DH22 Features:

  • The world's best, most affordable dual digital hybrid
  • Two digital hybrids in one chassis
  • DSP digital technology ensures the very best audio quality and the deepest, most reliable hybrid null
  • Easy to install, simple to operate
  • Built-in speaker amplifier
  • Balanced audio in and out
  • Mic or line input
  • Selectable auto mix-minus
  • Selectable AGC
  • Selectable caller ducking
  • Selectable auto-answer/auto-disconnect
  • Remote control and status
  • Automatically accepts all worldwide voltages
  • Worldwide compliant, including FCC, CSA, CE and CTR21
  • Dry line capability

Comrex DH22 Specifications:

  • Caller 1 and 2 Outputs: XLR male, 0dBu nominal, adjustable, balanced, 50½ impedance
  • Aux Output: XLR male, 0dBu nominal, adjustable, balanced, 50½ impedance
  • Telco 1 and 2 Lines: R-J11 connector
       * POTS (plain oldtelephone service) line or analog extension from a PBX or dry line (no DCoffset voltage).
       * A-Lead supervision provided
  • Telco 1 and 2 Sets: RJ-11 connector, A-Lead supervision provided
  • Telephone Transmit:
       * Nominal send input of 0 dBureferenced to -15 dBu onto the telephone line.
       * FrequencyResponse: 250 Hz to 3.5 kHz, ±1 dB
       * Signal to noise ratio:>56 dB
       * Distortion: <0.2%
  • Telephone Receive:
       * Nominal telephone line level of -15dBu referenced to caller output of 0 dBu
       * Frequency Response:250 Hz to 3.5 kHz, ±1 dB
       * Signal to noise ratio: >56dB
       * Distortion: <0.2%
  • Remote: DB-25 Female
       * Remote Send Input: 0dBu nominal,adjustable, unbalanced, 20k Ohm impedance
       * Remote Caller andAux Output: 0dBu nominal, adjustable unbalanced, 50 Ohmimpedance
       * Control Inputs: Remotely activate any of thefollowing functions with a switch closure to ground: Hybrid 1 and 2 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
  • Monitor Output: 1/4" stereo jack, Tip=+phase, Ring=ground, Sleeve=ground, 1W output into an 8½ load
  • Send Input: XLR female, Mic/Line selectable, -55/0dBu nominal, adjustable, balanced, bridging, 20k½ impedance
  • Mix-Minus, Caller-to-Send separation: 50dB nominal, Tail time: 32 milliseconds
  • Operating Temperature: 32-100°F/0-38°C
  • Humidity: 0-80 percent
  • Controls: Hybrid 1 and 2 On/Off Buttons, Volume Up/Down Buttons, On Status, Off Status, Hybrid 1 and 2 Send Audio Presence, Hybrid 1 and 2 Caller Audio Presence
  • Adjustments: Send Input Level, Caller 1 abd 2 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, Caller 1 Mix Select, Auto Mix-Minus Select, Aux Mix Select
  • Power: IEC Type, Auto Adjusting 100-240VAC, 2A, 50/60Hz, 30W
  • Null, Send-to-Caller separation: 55dB nominal Tail time: 32 milliseconds
  • Dimensions (W x D x H): 17.125" x 10.125" x 1.75" (43.6 x 25.7 x 4.44 cm)
  • Weight: 6.4 lbs. (2.9 kg)

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