Blown 20watt 4.7uf on soft start board - diyAudio
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Old 25th June 2007, 06:01 AM   #1
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Default Blown 20watt 4.7uf on soft start board

I blew the 3 of the 4 speaker out fuses with my Polk SDA speakers when hooking it up blindly. I realized my mistake, but wanted to finish my listening session. So I stuck 2 15a, and a 20a fuse in. Fix the speaker wiring. Turned it on, and poof. I looked for damage, and found none. So I busted out my mm found power on the soft start board. Unplugged it. Started testing resistors. The big 20watt 4.7uf was open. Took a hammer to it. Found the burnt spot. I am scared to just replace the resistor( I have 2 10ohm 10watt resistors). I don't want to blow anything else. What caused the resistor to blow after installing the speaker fuses?
Should I raplace the rail fuses, and give it a go with 5ampers instead of 10ampers?
Thanks Ben
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Old 25th June 2007, 06:49 AM   #2
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Hi Ben,

Sorry to hear about your problems, but I think you need to take it to a professional before you do more damage to it, or yourself.

regards
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Old 25th June 2007, 10:27 AM   #3
djk is offline djk
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Polk SDA speakers will blow up mono-bloc and bridge output amplifiers.

This includes dual-mono amps like the Adcom GFA555.
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Old 25th June 2007, 03:03 PM   #4
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Quote:
This includes dual-mono amps like the Adcom GFA555.
For bridged I can see trouble in a common-ground wiring, but why dual mono? I've had a 555 for years and hooked it to all sorts of wiring schemes (including common-ground) with no problem whatever.
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Old 26th June 2007, 06:29 AM   #5
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Killed this thread, and started another. Due to lack of sleep I rated a 4.7 ohm resitor a 4.7uf. I gotta watch stuff like that
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