Hi,
my brother-in-law is the audio guy at his church.
he has a crossover board which separates low and hi freq audio
and sends it to a woofer or tweeter.
He says that visually he sees a blown cap which is 8.2 mfd 100 wvdc

I told him that if it was tube gear, I would use a 10 mfd @ 160 wvdc
but since this is solid state which I'm not familiar with I'm not sure.
Also the guy at radio shack told him to replace with exact value

Also, i'm thinking this is an electrolytic by size?
any advice

tnx Patrick

for a crossover, you do not want polarized capacitors----there are non-polar electrolytics, but I think crossovers typically just use conventional film caps.

As for the voltage---once you get to the speaker, it does not matter if the amp is tube or SS----the voltage is determined by the power going to the speaker + the impedance. Suppose you have 30 watts RMS power into 8 ohms. The RMS voltage is root (30*8) = ~ 16 volts, but the peaks can be many times that.

It has nothing to do with solid-state VS tube. It should be close to the correct value but 5% should be fine (and if it's stereo, get a bunch of them, find the two that match the best, and the replace the same cap in both speakers). If you can't find close matches, you can parallel them with little ones to get them as close as possible. For stereo, matching the values is a lot more important than getting the exactly right value.

It shouldn't be electrolytic for a crossover, although there are non-polarized electrolytics. Some manufacturers use use polarized electrolytics for AC applications, but it's a dumb idea. Just get regular film caps.

Brett