Cardas Banana to 9mm Spade Adaptor: Cable Termination Guide
By Addicted To Audio - Home Audio Electronics & Accessories | Published: 2026-10-29
Category: How-to Guides
Learn how to use the Cardas Audio Banana to 9mm Spade Adaptor for flexible speaker cable termination. Step-by-step process with common mistakes to avoid.
Quick answer
Use the Cardas Audio Banana to 9mm Spade Adaptor to convert a banana plug speaker cable end into a 9mm spade connector. Follow these steps for a secure, long-term termination.
Why use a banana-to-spade adaptor?
Many speakers and amplifiers accept both banana plugs and spade connectors, but spades often provide a more stable, high-contact connection for bare wire or larger gauge cables. The Cardas adaptor lets you switch between termination types without cutting or re-terminating your cable.
This is especially useful if you change gear or want to audition different connections. The adaptor pack of four covers a stereo pair of speakers.
Trade-offs to consider
Adding an adaptor introduces an extra connection point, which can slightly increase resistance. However, Cardas uses high-quality materials to minimize signal loss. For most listeners, the convenience and flexibility outweigh any theoretical downside.
The 9mm spade size fits standard binding posts but may not suit very large or very small terminals. Verify your gear's post diameter before purchase.
How to terminate with the Cardas Banana to 9mm Spade Adaptor
- Prepare the cable end: Strip about 1/2 inch (12 mm) of insulation from the speaker cable. Twist the exposed strands tightly or tin them with solder to prevent fraying. Avoid leaving loose strands that could short against the adaptor barrel.
- Insert the cable into the banana plug: Loosen the banana plug's set screw, insert the prepared wire fully, and tighten the screw until the wire is clamped firmly. Ensure no bare wire protrudes beyond the plug. Use a small screwdriver to check the screw is snug but not overtightened, which could strip the threads.
- Attach the adaptor to the banana plug: Push the banana plug end of the adaptor onto the banana plug until it clicks or seats fully. The adaptor's spade end should be oriented so it will slide onto your speaker's binding post. If the fit feels loose, the banana plug may not be fully inserted. Re-seat and listen for the click.
- Connect the spade to the binding post: Loosen the binding post enough to slide the spade between the post and the nut. Tighten the nut firmly by hand, then give a quarter turn with a wrench if needed. Do not overtighten. A common mistake is overtightening, which can deform the spade or damage the binding post. Snug is sufficient.
- Test the connection: Gently tug the cable to confirm the adaptor and banana plug hold securely. Power on your system and listen for any intermittent crackling or dropouts, which indicate a poor connection. If you hear noise, re-check each connection point. The most likely culprit is an under-tightened binding post.
Product facts
- Cardas Audio Banana to 9mm Spade Adaptor: Cardas offers a variety of high-quality audio adaptors, suitable for anything from short-term problem solving to permanent solutions. This unit comes in a pack of 4. You get enough adaptors for a full stereo setup, and the build quality supports both temporary testing and permanent installation.
Cardas Audio Banana to 9mm Spade Adaptor
