CellTap 4C

Wireless Phone Audio Tap
JK Audio CellTap-4C

Capture Both Sides of the Conversation

CellTap 4C™ is an interview-recording adapter that connects between the headset and cell phone, providing stereo output to a recorder or mixer. CellTap 4C™ is compatible with most smart phones, tablets, and notebooks that use the 3.5 mm 4-conductor TRRS headset jack. Simply connect CellTap 4C between your existing ear-bud headset and phone, and then connect the stereo output to a mic level input on your recorder or mixer.

Learn More Details Specs

Product Details

Features CT D2 D3
HD Voice Compatible (7 kHz Wide-Band Speech)
Bluetooth Wireless Technology
4-conductor 3.5 mm Headset Interface
Switch Selects Between Popular TRRS Configurations
3.5 mm Stereo Input
3.5 mm Stereo Output
3-pin XLR Input/Output
1/4" Input/Output
3.5 mm TRRS Headset Jack
Screwdriver Caller Level adjustment
Passive Design (No Battery or AC Required)
> 18 Hours on one 9-volt Alkaline Battery
Made in America
Approved for Sale in Europe and Australia

Audio Quality

The transformer coupled stereo output provides the local mic on the left channel and the caller on the right channel. Local audio is a full bandwidth connection, meaning your voice will sound considerably better than the caller. Of course, audio quality is limited by the quality and placement of the microphone on the ear-bud style headset.

Wired Headset Required

CellTap 4C™ will not interfere with headset button controls on most devices. A headset is required for operation, as the phone will not recognize CellTap 4C without a headset connected.

TRRS Configurations

Internal switch supports both of the following wiring standards:

Sleeve = Ground
R2 = Mic
Sleeve = Mic
R2 = Ground
The word standard is used loosely, since there are no actual standards for headset wiring or control operation. Therefore, we cannot promise compatibility with every phone.


Record Output 1/8" (3.5mm) Stereo
Impedance 600 ohms
Level 2.4 mV RMS (-50 dBu nom)
Size 2” x 2” x 1.3” (5.1 x 5.1 x 3.3 cm)
Weight 3.5 oz
*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.