The Audio-Technica AT8531 is an in-line power module built for use with Audio-Technica condenser microphones that use the UniPak or miniature-style connectors. It provides clean, reliable power to your mic through either standard 48V phantom power or a single AA battery, making it perfect for both studio and field use. The unit includes an on/off switch and a low-frequency roll-off control to reduce unwanted rumble or handling noise, along with a standard XLR output for easy connection to mixers, interfaces, or recorders.

This AT8531 is in very good condition with only minor cosmetic wear from normal use. All switches, inputs, and outputs have been tested and work properly. A dependable and essential piece of gear for anyone using Audio-Technica lavalier or instrument microphones who wants consistent performance and flexibility in any recording or live environment.

Item Condition & Testing
All used gear is fully tested when it arrives and again before shipping, so you can buy with confidence. Any included accessories are shown in the photos, and any functional issues are always noted. Expect normal cosmetic wear that may not show clearly in pictures. Since items are also available in-store, light demo wear may be present.

Shipping
We ship to the contiguous 48 states using flat-rate pricing that includes insurance. If shipping looks high, send us your ZIP for a more accurate quote. Orders outside the lower 48 may require additional costs—please reach out before purchasing. Larger or fragile items (amps, cabs, drum kits, etc.) may be local pickup only; contact us if you’re unsure.

Returns
Returns are accepted within 48 hours of delivery. The buyer covers return shipping, and a 20% restocking fee applies. If you have any questions before buying, feel free to message us—we’re happy to help.

Order Issues
If your order isn’t processing, double-check that your billing and shipping addresses match. For any other issues, just reach out and we’ll get it sorted quickly.