natebot88
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- Joined
- Sep 17, 2020
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- Preamp, Processor or Receiver
- Denon AVR-S750H
- Front Speakers
- Polk Monitor 5b
- Surround Speakers
- Realistic Minimus 7
- Subwoofers
- JBL PSW-1000
A few months ago I recapped both of my Polk Monitor 5b's with brand new Dayton MPT poly caps, (but not the 2 ohm, 5W resistor on each).
I also replaced the stock SL-2000 tweeters with brand new RD0-194 drop in replacements. They sound fantastic!
A few weeks ago I started noticing slight distortion in one tweeter. I confirmed the tweeter is damaged by swapping it to the other cabinet and noting that the distortion followed.
Measuring both tweeters with REW and UMIK-1 confirm that Fc (-3 dB) for both is bang on factory spec at ~1.1 kHz.
The amp is a Denon AVR-S750H at 75W / 8 ohm. Confirmed all good connections in the signal path.
I never played music too loud since installing these upgrades. Though I did kind of an ugly soldering job given a terrible, old soldering pen (it was all I had), there appear to be no cracked solder joints in the xover.
I will order a new tweeter if I know there is no flaw in my system that will blow out the new one (i.e., it was bad from the factory).
What could have caused the damage?? Could an improperly-adjusted preamp not compensating for EQ gain do it? (Less than 5 dB gain!)
I also replaced the stock SL-2000 tweeters with brand new RD0-194 drop in replacements. They sound fantastic!
A few weeks ago I started noticing slight distortion in one tweeter. I confirmed the tweeter is damaged by swapping it to the other cabinet and noting that the distortion followed.
Measuring both tweeters with REW and UMIK-1 confirm that Fc (-3 dB) for both is bang on factory spec at ~1.1 kHz.
The amp is a Denon AVR-S750H at 75W / 8 ohm. Confirmed all good connections in the signal path.
I never played music too loud since installing these upgrades. Though I did kind of an ugly soldering job given a terrible, old soldering pen (it was all I had), there appear to be no cracked solder joints in the xover.
I will order a new tweeter if I know there is no flaw in my system that will blow out the new one (i.e., it was bad from the factory).
What could have caused the damage?? Could an improperly-adjusted preamp not compensating for EQ gain do it? (Less than 5 dB gain!)
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