Rode HJA-4 3.5mm TRS to 1/4-inch Headphone Adapters, 4-Pack

Rode HJA-4: Connect Any 3.5mm Headphones to Your Quarter-Inch Gear

The Rode HJA-4 is a four-pack of 3.5mm TRS to 1/4-inch (6.35mm) headphone adapters that let mini-jack headphones plug straight into any device with a full-size 1/4-inch headphone socket. It is the small part that quietly removes a daily frustration: the headphones almost everyone already owns end in a 3.5mm plug, while professional mixers, interfaces, and recorders put out 1/4-inch, and without an adapter the two simply do not meet. With four in the box, you stop hunting for the one adapter that always goes missing.

Why Headphones and Studio Gear Speak Two Different Plug Sizes

Consumer headphones and earbuds standardized on the compact 3.5mm (1/8-inch) plug because it fits phones, tablets, and laptops. Professional audio gear kept the older, sturdier 1/4-inch (6.35mm) jack because it is more robust and locks in more securely for stage and studio use. The two connectors carry the same signal at the same levels; they are simply different diameters. An adapter like the HJA-4 bridges that mechanical gap, passing the audio through unchanged while converting the plug size, so there is no loss in fidelity, only a change in fit.

What TRS Wiring Means for Your Stereo Monitoring

The HJA-4 is a TRS adapter, and that matters. TRS stands for tip-ring-sleeve, the three conductors on the plug that carry the left channel, the right channel, and a common ground. A basic TS (tip-sleeve) adapter has only two conductors and would fold your headphones down to a single mono channel. Because the HJA-4 preserves all three contacts, your left and right channels stay fully separated, so panning, stereo imaging, and any spatial detail in your mix reach both ears exactly as intended.

Built to Pair with the RODECaster Pro and AI-1

Rode designed the HJA-4 with its own hardware in mind. The RODECaster Pro production console and the AI-1 audio interface both provide 1/4-inch headphone outputs, and if the headphones on your desk terminate in a 3.5mm plug, the HJA-4 is the piece that connects them. On a multi-guest podcast, where several people each need their own pair of headphones, having four adapters on hand means every participant can monitor at once without anyone being left plugless mid-session.

Who the Rode HJA-4 Is For

This adapter pack is for the podcaster, streamer, or home-studio owner whose headphones end in a mini-jack but whose gear does not. It is for the engineer who wants spares stashed in the mic drawer, the bag, and the second room so a mismatched plug never stops a session. And it is for anyone setting up a listening station for guests, students, or collaborators who all arrive with everyday headphones. Four adapters, one small purchase, and the plug-size problem is solved for good.