Headphone Adapters

1/4" is the standard size headphone jack/plug for Stereo and Surround Sound Receivers and Home Stereo Amplifiers. It's the same size as used for Guitar cables and Musical instrument cord connectors.
3.5mm is used on iPods and MP3 players and most types of small electronics that have sound.
2.5mm was usedby many early cell phones
RCA connectors are used on the back of most Home Theater equipment, cable boxes, etc. Generally used for "Line level" not headphone level Inputs/Outputs

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3.5mm Audio and Microphone extender for iPhones and Android smartphones, 4 conductor

$7.95
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ProCable® Shortz 3.5mm Audio Extender 4 inch Cable, 4-Conductor, white or black

$7.95
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ProCable Shortz Audio Y-Splitter for Audio and Mic

$6.95
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ZipLinQ

Retractable Zip Linq Handsfree Headset for Nokia with Jack, Treo, & Palm

ZipLinQ
$9.99
$3.95
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Calrad Electronics

3.5mm Stereo Female Mini Jack to 1/4" Stereo Male Plug

Calrad Electronics
$1.83
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Calrad Electronics

3.5mm stereo mini plug to stereo 1/4" phone jack, Gold plated

Calrad Electronics
$2.65
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Calrad Electronics

Stereo 1/4" female to 3.5mm Mini plug male Adapter for Headphones or patch cables

Calrad Electronics
$1.30
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IK Multimedia

iLine Headphone Splitter Cable, 3.5mm mini plugs, male to two females

IK Multimedia
$14.99
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Calrad Electronics

6in shielded cable w/ 3.5mm stereo plug to two 3.5mm monojacks!

Calrad Electronics
$3.13
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