SAD 1c Volume surge

gdphoto

While I was upstairs at Christmas time my wife, who usually does not touch the stereo, was putting on a CD. Of course the peramp was set on phono so she got no sound. I'm guessing she first turned the volume all the way up and started hitting buttons. When she hit the right button there was a huge surge of volume, louder then it's ever set to. I never go beyond half volume which is very loud. She must have been at three quarters or more. It was only for a second or two. Since then the right channel has, at certain frequencies, a sibilance issue. Sounds like it was coming from the top RD094 tweeter. I had an extra one so I swapped it out and it seems to have gotten better, but not as good as it was before the surge. My question is can the XO's get damaged due the a surge? Is there something else I should look at?

pitdogg2

yes they can, I'd also look at the other tweeter in the same speakers and the other speaker.

treitz3

Try swapping the left and right speaker cables from the amplifier. Does the issue with the tweeter move speakers? If it does, you have an issue with the amplifier or something else upstream. If it does not?

Switch the speaker cables back to their original position.

Try swapping both the tweeters from the questionable speaker to the known good one and vice versa. If the sound follows, then it is the tweeter (may just be old and not broken in yet). If the sound remains the same after JUST swapping the tweeters and nothing else, then you have a crossover issue.

Tom

Schurkey

I'd say it's very unlikely to be a crossover issue. These speakers were rated for use with amplifiers of "500 watts"; which by itself is fairly meaningless but it does suggest excellent power-handling capacity. When the crossovers are rebuilt, the typically-installed upgrade components tend to be of higher wattage (resistors) or higher voltage rating (capacitors) making it even less likely to be crossover damage.

'Course, anything can happen.

westmassguy

If the crossovers are unmolested, then she may have tripped the polyswitch. They can get noisy after being tripped, and their resistance can chance.

gdphoto

I believe the poly switches were removed when the XO's were rebuilt.