Received 2 RM30s and they are behaving differently

cmatthes1

I just received 2 RM30s for surrounds and noticed that either 1) the receiver was clipping the signal on the right speaker or 2) there was an issue with the speaker. The right was at a higher volume as it is further away so I thought that was the issue as to why there was a difference between the two. It was on generic parts when it would get louder during commercials etc. I decided test out a low frequency tone test cd around 300Hz to 80Hz (80Hz being the crossover on the receiver for the surrounds).

I reset the volume to be equal to both speakers.

I found that the right speaker put the lower tones out primarily to the bottom driver
I found that the left speaker put the lower tones out primarily to the top driver

I found that the right speaker had a certain volume where the tone would jump a few octaves higher. This was on 200Hz-250Hz test tone. I did not push the left speaker to this point but if they were behaving the same it should have done the same.

I have checked the wiring to make sure the polarity was hooked up correctly and it matches.

cmatthes1

On further testing at the higher volume the top driver starts making the higher pitch noise at a certain volume threshold.

cmatthes1

Doh.. watched a movie, it is getting worse.. back it goes

Jed Leland

Hello,
Don't throw in the towel too quickly! Usually the problem can be cured by a replacement tweeter or driver and that speaker is fairly easy to service. Let Polk's customer service help you out?
Cheers, Jed

cmatthes1

Oh I'm good.. I just bought them. Just hopefully I can get a replacement from polk warranty.