Question: The Speakon cable will not lock in my BH500, how can I fix this Answer: We have noticed that some Speakon connectors will not completely lock on the BH500 head. The reason for this is a sharp corner on some of the Speakon connectors that gets in the way of the screw that is holding the connector on the amp. This doesn't allow you to fully rotate and lock the connector, causing the issue. There are 2 ways to solve this issue: 1. Use a cable that has this style Speakon connector: imagesBP96DUOR.jpg 2. If your cable uses this style of Speakon connector, you can lightly file the plastic corner highlighted in the picture: images.jpgimages6Y51YYOJ.jpg