Yamaha RX-V730 problems
I used to have a set of speakers with 'poly switch' over-current protectors (kind of a 'soft' fuse the size of a small ceramic capacitor) installed in-line with the speaker terminals.
(Each speaker in an enclosure needed its own device.)
The theory was they appeared as a dead short until their rating was exceeded, going open-circuit to protect the (assumed, more expensive) speaker element. When things 'cooled down' it returned to the former short status and the speakers came alive again.
Testing the device with a decent drive signal (it worked), I noticed the sound 'strangled' and only a low-volume, higher-frequency component of the source signal was heard through the speaker.
(So I guess it wasn't *totally* open circuit...)
After a few seconds of signal removal (and reduction of source volume) the sound came back to normal.
Here's my thought: Perhaps your speakers have these devices installed and the devices are operating accordingly.
Of course, if the source signal is of a known low-volume, then it sounds like an amplifier component is failing on load.
Especially if the speakers behave normally using another amplier.
Jan 26, 2007 |
Yamaha RX-V730 Receiver