I will be contacting Bag End about this as well, but thought I'd start by asking our group. Do Bag End coaxial cabinets have non-standard Speakon connector wiring? Edit: Yes, older ones do; see posts below. I've connected several of my amps with Speakon outputs to my Bag End S15X-D. I get no sound with any of them, connected to either of the two Speakon inputs. I'm using brand new Bayou Cables, and the cables work great when I connect my Eden CX-110 extension to my CXC-110 combo, Speakon to Speakon. The cab plays fine with a 1/4" to 1/4" cable connection, or a Speakon output to 1/4" input cable. I've removed the jack plate from the cab and examined it for any sign of burning, melting or whatever, resulting from overpowering. The connections and boards on the back look fine, and brand new still. The cabinet is a couple of years old; I bought it used from an eBay seller. It's in really good condition, sounds great and shows no signs of abuse whatsoever. I've done all the requisite troubleshooting other than testing the Speakon leads on the back of the jack plate with a multimeter. I do need to do that to verify my hypothesis, which is that Bag End uses a non-standard Speakon jack configuration, instead of the usual 1+, 1- scheme. Edit: See posts below.