N Cook wrote:


it would progressively have failed from collective 4 ohm to 5.3 to 8 to the
current overdriven and useless single 16 ohm one


Are you saying that the four speakers were all wired in parallel, to
give 4 ohms? That`s unusual for a 4x12 guitar cab. they would usually
be in series/parallel, giving 16 ohms, and allowing two cabinets to be
used with the amp. In which case, if any one speaker went o/c, its
'series twin' would stop receiving power but the other pair would still
work - until they were overloaded and blew.

Ron(UK)