Universal Host

VoIP/PBX Digital Hybrid
JK Audio Universal Host Front

The Digital Hybrid for a Busy Desktop.

Universal Host easily converts your IP or PBX telephone into a professional, affordable interview station. This desktop digital hybrid provides talk show quality caller audio from most telephone systems. Simply connect between your telephone handset and the base of your telephone. The digital hybrid connects audio signals to your IP or PBX type telephone system through the telephone handset cord. Universal Host provides connections for a microphone, headphones, mixer, sound card, and telephone handset. The stereo output jack on the back of the unit provides your voice on one channel and only the caller’s voice on the other channel. The balanced XLR output jack contains only the caller’s voice. The Handset and Online buttons select between talking on the handset, or sending and receiving through the audio connections. A second switch selects between monitoring the caller or listening to the USB codec over the headphones.

Learn More Details Specs

Product Details

Features PBX UH
Excellent Separation of Caller and Talent Voice
16-bit DSP technology
16-bit USB Audio CODEC
Proprietary Auto Null Algorithm (50 dB null)
Send XLR Line Input
Mic/Line Switch
3.5 mm Mono Line Input
Caller XLR Line Output
3.5 mm Stereo Line Output
3.5 mm Headphone Jack
Send and Caller Signal Level LEDs
Send and Caller Volume Controls
Handset Selector Switch
(Electret, Carbon, Dynamic)
Made in America
Approved for Sale in Europe and Australia

Digital Signal Processor

The digital hybrid connects audio signals through the telephone handset cord without the transmit / receive crosstalk common to analog hybrids. The Digital Signal Processor (DSP) continuously monitors both the phone line and audio signals to deliver excellent separation. This proprietary, dual-convergence echo canceller algorithm can achieve excellent separation, typically exceeding 50 dB, without any setup and without sending a noise burst down the line.

Talk Show Quality Interviews

Connect a professional dynamic mic and headphones to Universal Host to capture your voice in full audio bandwidth, while maintaining excellent separation between your voice and the caller.

Conference Rooms

Easily connect your PA system to the existing IP or PBX telephone system. The echo canceller algorithm prevents feedback and allow full duplex conversations.


The 16 bit USB audio CODEC allows stereo recording at up to 48 kHz sampling rate, with the talent voice on the left channel in full bandwidth, and the caller on the right. Play recordings from your computer directly into the phone system.

JK Audio Universal Host Back


Send 1 Balanced Female XLR
Impedance 1k ohms
Level 15 mV RMS (-34 dBu nom)
Mic/Line Pad Switch +6 dBu max
Send 2 1/8" (3.5mm) Mono
Impedance 20k ohms
Level 250 mV RMS (-10 dBu nom)
Caller Out Balanced Male XLR
Impedance 200 ohms
Level 500 mV RMS (-4 dBu nom, +14 dBu max)
Caller Only
Stereo Out 1/8" (3.5mm)
Impedance 50 ohms
Level 250 mV RMS (-10 dBu nom, +6 dBu max)
Left = Send, Right = Caller
Headphone 1/8" (3.5mm)
Impedance 8 ohms
Level 250 mW
Mixed Send and Caller
Connector Mini Type B Female
Standard v2.0
Sampling Rate 32 kHz, 44.1 kHz, 48 kHz
Handset and Telephone Connectors RJ22
Isolation 1500 VAC
Frequency Response Telephone Side 200 Hz-3600 Hz
Power 120-240 VAC Power Supply
Size 7" x 6" x 1.6" (18 x 15 x 4.2 cm)
Weight 2.2 lbs. (1kg)