🎧🔀 3.5mm • 3.5mm Stereo Splitter

This splitter duplicates or merges stereo audio signals between 3.5mm TRS jacks. It’s used to share audio between devices, route stereo signals to multiple outputs, or combine stereo sources into a single input. Ideal for headphones, speakers, recorders, and embedded boards.
 
🔧 Adapter Forms
1x 3.5mm TRS Male → 2x 3.5mm TRS Female
Splits one stereo output into two stereo outputs
Commonly used to share audio between two headphones or speakers
1x 3.5mm TRS Female → 2x 3.5mm TRS Male
Merges two stereo outputs into one stereo input
Used to combine sources (e.g., two phones into one speaker or recorder)
Passive Y-adapter—no signal conversion or amplification
Compact barrel or short cable format
 
🖥️ Compatible Devices
🎧 3.5mm TRS jacks on:
Phones, tablets, laptops, MP3 players
Headphones, earbuds, portable speakers
Audio interfaces, DACs, car stereos
Embedded boards and AV modules
 
✅ Common Uses
🎶 Share music between two listeners (1x male → 2x female)
🔊 Connect two sets of speakers to one device
🎛️ Merge stereo outputs into a single input (1x female → 2x male)
📼 Feed dual stereo sources into a recorder or mixer
🧪 Prototype stereo routing in compact rigs or embedded systems
 
🧠 Signal Format
🎧 TRS (Tip-Ring-Sleeve) on all ends
Tip = Left audio
Ring = Right audio
Sleeve = Ground
🔁 Signal remains unbalanced stereo
⚠️ No channel isolation—shared ground and potential crosstalk
 
⚠️ Things to Watch Out For
🚫 Not suitable for TRRS (mic-enabled) jacks unless specifically wired
🔄 Merging outputs (female → 2x male) can cause signal conflict or distortion
📉 Volume may drop when splitting one output to two devices
🔌 Some devices may auto-detect headphone impedance—can misbehave
🧪 Avoid using with powered outputs unless adapter is rated for it
 
🛠️ Quick Tips for Beginners
🧭 Use 1x male → 2x female for sharing audio; 1x female → 2x male for combining sources
🔍 Confirm TRS plugs—two black bands, not TRRS (three bands)
🧵 Keep cable short to reduce signal degradation
📼 Test with known stereo source before live use
🧯 Avoid merging powered outputs—use mixer or isolator instead