Universal Telephone Audio Interface

Remotely Anywhere.

Pick up this new handheld road tool to get audio in and out of analog phone lines, PBX systems, even cell phones. Perfect for Remote Broadcasts, IFB feeds, or interviews over any phone connection.

Learn More Details Specs

JK Audio ComPack Front

Product Details

HD Voice Compatible (7 kHz Wide-Band Speech)
Works with Analog and Digital PBX or VoIP Phones
Connects to Wireless Phones & Notebooks
4-conductor 3.5mm Headset Interface
Headphone, Mic, and Line Input Level Controls
XLR Mic Input (Mic/Line Switch)
XLR Line Output / Com Link
3.5mm Stereo Line Input
1/4" Stereo Headphone Jack
Transmit Clip LED
Battery Test LED
DTMF Keypad and Lockout Switch
Handset Selector Switch (Electret, Carbon, Dynamic)
>20 Hours on one 9V Alkaline Battery
Made in America
Approved for Sale in Europe and Australia

Wireless Phones and Notebooks

Simply plug ComPack into the 3.5 mm headset jack of your wireless phone or notebook computer. Your cell phone will recognize ComPack as a headset which will disable the internal mic and speaker.

ISDN, PBX, and VoIP Systems

Unplug the handset from any phone and plug the coily cord into ComPack. You can now send and receive audio through the ISDN, PBX, or VoIP telephone set.

Analog Phones

Plug ComPack into an RJ-11 jack, go off-hook and dial, or answer an incoming call.

Add a Phone Line to
the Party Line

ComPack also functions as a simple telecom interface for your beltpack intercom system. This no-frills feature allows you to connect the 3 pin male XLR to your wet party line. This provides a full duplex, always-on connection to any telephone network.

JK Audio ComPack Top/Bottom JK Audio ComPack Left Side JK Audio ComPack Right Side


Mic In Female XLR
Impedance 1k ohms
Level 15 mV RMS (-34 dBu nom)
Mic/Line Pad Switch +6 dBu max
Line Input 1/8" (3.5mm) Stereo
Impedance 20k ohms
Level 250 mV RMS (-10 dBu nom)
Mix Out Male XLR
Impedance 600 ohms
Level 45 mV RMS (-25 dBu nom)
Com Link Male XLR
Bi-Directional Unbalanced
Headphone 1/4" Stereo
Impedance 8 ohms
Level 1/2 watt
Phone Line Connector RJ11C
Handset Connector RJ22
Ringer 0.9B REN
Isolation 1500 VAC
Keypad DTMF
Power 9 volt battery
AC power supply 120-240 VAC (included)
Size 8" x 3" x 2.2" (20.3 x 7.6 x 5.6 cm)
Weight 1.5 lbs (680 g)
*HD Voice: While standard phone calls have a narrow bandwidth of 300 Hz to 3.4 kHz, HD Voice calls offer 50 Hz to 7 kHz bandwidth. The additional 1.5 octaves on the low end gives voice a more natural sound, while the additional upper octave dramatically improves speech clarity and intelligibility.

*Wireless HD Calls: To take advantage of this extended bandwidth, both phones on the call must support HD Voice, and both phones must be on the same carrier, in coverage areas that support HD Voice.