InLine audio adapter 3.5mm plug / 6.3mm jack socket stereo

The InLine Audio Adapter 3.5mm male InLine 99303 converts a 3.5mm male plug to a 6.3mm female socket, enabling connection of devices with a 3.5mm stereo jack to headphones or other equipment with a 6.3mm stereo plug. The adapter is black and intended for reliable audio signal transmission between devices with different jack sizes.

Advantages

The adapter provides a simple, single-piece solution for connecting 3.5mm sources to 6.3mm headphones or instruments without additional cables. Its compact inline design and metal contacts ensure stable connection and consistent audio quality. The black finish offers a discreet appearance suitable for studio and stage environments.

Suitable for

• Connecting earphones or portable players with 3.5mm output to amplifiers, mixers or headphones with 6.3mm plugs
• Use in studio, stage, rehearsal or home audio setups
• Temporary or permanent connection between consumer devices and professional audio gear

Key specifications

• Connector 1: 3.5mm jack male
• Connector 2: 6.3mm female (stereo)
• Colour: Black
• Brand: InLine, MPN: 99303, EAN: 4043718030996

How to use

Insert the 3.5mm male plug into the audio source’s 3.5mm stereo jack, then insert the 6.3mm stereo plug of the headphones or cable into the adapter’s 6.3mm female socket. Ensure both connections are fully seated to maintain proper contact and signal transfer. Remove by pulling straight out on each connector.

Recommendations

For best performance, avoid excessive bending or strain at the adapter connections and keep contacts clean and dry. Use the adapter in appropriate signal-level setups (line/headphone) to prevent mismatch with unbalanced instrument or microphone inputs.