DH20 Overview

The DH20 Digital Hybrid incorporates the latest in DSP technology to provide you with the best sound and easiest installation.

The DH20 are high quality single-line telephone interfaces, designed to interconnect 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 deliver 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.

DH20 Specifications

Connections

• Caller Output: XLR male, 0dBu nominal, adjustable, balanced, 50 Ohm impedance

• Aux Output: XLR male, 0dBu nominal, adjustable, balanced, 50 Ohm impedance

• Telco Line: RJ-11 connector, POTS line or analog extension from a PBX or dry line (no DC offset voltage)

• Telco Set: RJ-11 connector

• Remote: DB-25 Female

• Remote Send Input: 0dBu nominal, adjustable, unbalanced, 20k Ohm impedance

• Remote Caller and Aux Output: 0dBu nominal, adjustable, unbalanced, 50 Ohm 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

• Monitor Output: 1/4" stereo jack: Tip=+phase, Ring=ground, Sleeve=ground, 1W output into an 8 Ohm load

• Send Input: XLR female, Mic/Line selectable, -55/0 dBu nominal, adjustable, balanced, bridging, 20k Ohm impedance

Telephone Transmit

• Nominal send input of 0 dBu referenced to -15 dBu onto the telephone line

• Frequency Response: 250 Hz to 3.5 kHz, ±1dB

• Signal to noise ratio: >56 dB

• Distortion: <0.2%

Telephone Receive

• Nominal telephone line level of -15 dBu referenced to caller output of 0 dBu

• Frequency Response: 250 Hz to 3.5 kHz, ±1 dB

• Signal to noise ratio: >56 dB

• Distortion: <0.2%

Mix-Minus

• Caller-to-Send separation: 50 dB nominal

• Tail time: 32 milliseconds