Rodge, on the UK section of the Axiom homepage there's a toll free UK phone number(001-866-244-8796)to call for assistance. It may be less awkward to speak directly with Joe rather than going back-and-forth with e-mails. As Gena points out, if the amplifier is defective another one could be sent out; this wouldn't require shipping the sub back.

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Enjoy the music, not the equipment.