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In Reply to: Safely testing a pre/power amp posted by graciouslee on February 9, 2016 at 00:39:05:
Any crossover cap will block all DC, assuming the cap is intact, and almost every tweeter has a cap in series. Distorted AC output from an amp playing beyond its linear output is usually what blows tweeters. Or they could have just died of old age or suffered mechanical damage. Or perhaps the xover cap has gone short circuit and passed DC or low frequency AC to the tweeters and they are blown. Or perhaps the cap has gone open circuit and passes nothing; the tweeters might be fine. You need to do a little more investigating.DC will usually not wreck woofers until it gets above one volt and plays for a long time. It's not a good thing, but it probably won't wreck anything.
Try measuring at the amp outputs while you cycle power off and on again. Then with the amp already powered, with signal at low volume, just touch the speaker cable leads to the speaker terminals, NOT securely attached to them. Use the inherited speakers, not your own good ones. If you don't hear anything bad, attach the speaker cables and play the amp for a while, turning up the volume in small increments. If you don't hear severe distortion or notice excessive heat, it's probably fine.
Peace,
Tom E
berate is 8 and benign is 9
Edits: 02/10/16
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Follow Ups
- DC does not blow tweeters - madisonears 18:31:40 02/09/16 (0)
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