Bad Crossover? - Home Theater Forum and Systems - HomeTheaterShack.com

 
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post #1 of 1 Old 02-03-18, 12:42 AM Thread Starter
 
Join Date: Mar 2011
Posts: 15
Bad Crossover?

I am having some deep technical issues with my TSi500s that I have had for a good while.

Signal chain: Laptop->Steinberg UR22MkII-> Yamaha 1065->TSi500.
Using a Dayton EMM-6 and REW for measurements

I setup REW to do some room measurements, and noticed a severe dip in my high frequencies. After some experimentation, I determined that the tweeter in my left tower was bad. I pulled it out, and it reads full short with continuity tester. I also pulled the right tower's tweeter and it reads a solid 4.0 Ohms.

While both tweeters were out, I decided to run additional sweeps in just the high frequencies to confirm the bad tweeter. These sweeps were done with the jumpers removed, and only the upper terminals connected. I noticed that there was an odd roll off, and realized the problem is deeper than my bad tweeter.

Two of the attached plots show a sweep from 10kHz-20kHz. There is a clear roll off for the right tower that shows the mids are still doing some lifting in the high freqs that isn't there on the left tower.

I also generated some pink noise and held my RadioShack SPL meter about arms length from each tower, there was about a 6dB reduction on the "better" right tower.

I connected the right tower to the left output of the Yamaha to confirm that it wasn't and AVR issue. Same results on both the REW sweep, and the SPL meter.

I'm not sure what else to try to confirm what the issue is, short of a complete teardown of the towers, removing all drivers and crossovers- which I have never done. It might be important to note that the tweeters on both towers were replaced about 5yrs ago. I had a moment of clutz and didn't power the system down before unplugging and a high frequency chirp fried both in one swoop.

Would these diagnostic results indicate a faulty crossover? Could a bad crossover have damaged a replaced tweeter? In my head I would think yes, if it failed in a way that low freqs were being sent to the tweeter. I don't have any experience with a failing crossover, so I'm not sure.

Any suggestions for more diagnostics I could run (white/pink noise SPL readings, sin wave SPL readings, frequency sweeps in REW, anything- I'm somewhat savvy), or any other suggestions in general would be greatly appreciated.

If it comes down to just the crossover being bad and all the drivers are good, I may take a stab at a custom crossover. I know there are a few threads out there on crossover upgrades for the Polk towers. I would have loved for it to just have been the bad tweeter, but my signs are pointing to a deeper issue.

Am I totally off track?
Attached Thumbnails
Bad Crossover?-right-tower-high-freq.png  

Bad Crossover?-right-tower-full-sweep.png  

Bad Crossover?-overlay.png  

Bad Crossover?-left-tower-high-freq.png  

Bad Crossover?-left-tower-full-sweep.png  

fattmann is offline  
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