N Cook wrote:
Ron(UK) wrote in message
news
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)

Crate BV412R, Blue Voodoo
2 separate permanently wired paralleled pairs of 16 ohms so 9 ohms each
section.
Switched so they are in series to give 8 + 8 = 16
or paralleled to give 8//8 = 4 , ie all 4 in paralle

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

I want to jump in here and ask another related question.

It sounds like there are at least two ways to wire a 16 Ohm 4x12 cab.
One way explained above where two pairs are 16//16 and then those are
series 8+8. Another way would be series two pairs 16+16 and then
32//32 to give 16.

Reading the discussion above it sounds like if the cab was wired like
the latter above a pair of the speakers in the cab blowing would have
meant the amp seeing 32 Ohms and the rest would not have happened.
Saving half of the speakers and the amp.

Is this correct?