Join Date: Jul 2010
Location: Aalesund, Norway
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Definitely look for a short somewhere on any of the speaker cables, and do not connect your new receiver until you have found the problem.
I have a similar Marantz I use for demo and testing on speakers I design, and have burned output stages 3 times on it.
The failures were caused by shorts in the prototype crossover inside the speakers- vibrations and sound in the cabinet caused wires to move enough to short out, and then the output stage instantly burns.
I first suspected the receiver could not handle the load and output level, but that is clearly not the case, because it can run all the way up to clipping just fine, even though the speakers are 4 ohm.
After fixing the problem, it works just fine.
Kind of annoying having to rebuild output stages once every other week..
The receivers can have really good output stages and sound very good, but they are very fragile compared to more conservatively dimensioned output stages, it is not uncommon for power amplifiers to be able to sustain a short on the output at full level, but these receivers will not survive any abnormal abuse, so just have to be more careful.