SDA CRS Blown Cross-Overs?

mojoracer

I have a pair of old SDA CRS that were my fathers. I have been using them with a home theater set up for 1 year. The set up is driven by a Yamaha RXV-2095. I found prologic television sounded funny recently. When I tried to play a stereo music CD, I thought my amp was going bad. Volume jumping up and down, and a scratch quality to the music (like a dirty volume knob). I hooked up a pair of KEFs from another system I have, to the main front channels where the Polks resided. Everything works fine.

My question to the experts here is, based on the description what is wrong? I am guessing maybe the cross over is blown out? I looked at all the speaker cones, and they look fine. Did I wreck the speakers utilizing them in a 5.1 set up? Is my RXV-2095 Yamaha not a common ground amp . P.S. I am running the interconnect cable with this set-up.

When I first brought these speakers home, I used them with a 1980s 85 watt Yamaha 2 channel AMP and they sound fantastic. I thought for 2 channel music, they did not sound as good in stereo mode with the newer RXV2095 Yamaha.

Thanks in advance for your advice and opinions!

ben62670

Try running them without the IC. If the problem disappears then you don't have a common ground receiver. Welcome to Club Polk.
Ben

mojoracer

ben62670 wrote: »

Try running them without the IC. If the problem disappears then you don't have a common ground receiver. Welcome to Club Polk.
Ben

It still did it with the IC removed....

HB27

Lightly push in on your mid woofers. They should move freely and not be scratchy at all.

mojoracer

Well, I checked the mid woofers. They are free and move smoothly. So I hooked up the right speaker to the amp without the IC and it played fine. Then I hooke up the left speaker and it was fine. Then I connected the IC and the speakers were playing great. So I cranked up the volume, and it was good. I sat in the sweet spot and listened to 2 CDs of music. I really like these speakers. I just hate self healing electronic devices!

mojoracer

So the poly switches re-set themselves? Are they like a breaker point? The amp I have never clipped, and I normally can not take it past 50% volume (painfully loud). Most times I run it around 20% when watching television and up to 40% for music. What about these upgrades? I am probably game for the capacitors in the cross over, since I hear they dry out with old age and loose some function. Where and what do I need to buy to replace the caps? What tweeters are you refering to. Polk replacement parts, or some other maker. Thanks...

anonymouse wrote: »

You almost certainly had an issue with the Polyswitches tripping.

Keep an eye on the volume going forward - that Yammie is likely clipping at higher volumes.

And consider upgrading the crossovers and the tweeters when you have the time and fundage.

meangreen76

I found in my SDA-SRS's that the polly switch didn't reset back to 0 ohms. and voices sounded like they were behind the instruments. try placing a jumper wire across the polly switch and watch your highs come back to life. but warning if you jumper the protection device out you run the risk of blowing your tweets. So don't play them overly loud.

mojoracer wrote: »

So the poly switches re-set themselves? Are they like a breaker point? The amp I have never clipped, and I normally can not take it past 50% volume (painfully loud). Most times I run it around 20% when watching television and up to 40% for music. What about these upgrades? I am probably game for the capacitors in the cross over, since I hear they dry out with old age and loose some function. Where and what do I need to buy to replace the caps? What tweeters are you refering to. Polk replacement parts, or some other maker. Thanks...

Face

mojoracer wrote: »

I just hate self healing electronic devices!

It's better than blowing tweeters, right? Time to get a real amp.