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This is the cable I purchased. The AT Cube 500 combo only has a 1/4" TS female connector to connect the extension cab to. The cab has a combo Neutrik / 1/4" TS connector. I just have to trust GR Bass on this one.This speaker cable that is called a bass cable seems to be a Speakon to Jack cable. At least it has Neutrik connectors, but I suspect its aimed at people who have older speakers with jack connectors and a more modern bass amp with Speakons. It makes no difference to the performance of the cable, but is potentially capable of destroying an internally bridged class D amp if you happen to touch earth with the jack connector. The jack looks as if it has a metal casing, so not recommended. Both positive and negative connections on most modern class D amps should not be earthed. If you have a less powerful vintage amp with a jack speaker output, the cable will work ok. The jack plug is the limiting factor for current flow.

