Weird Amp Problem

Stewart8989 · 6th April 2007, 12:26 AM

I'm running a set of Polk SR 6500's off of a bridged Alpine Alpine MRV-F345. I have yet to get it professionaly tuned but what is making me scratch my head is when played loudly enough or songs with a lot of bass only one woofer will bottom out. I have yet to play it loudly enough to get the other woofer to bottom out. My first assumption was a problem with the speaker, so I switched the channels on the amp and the problem switched to the other speaker. So it's definitely not the speaker, all settings on the amp are the same for both channels. So could this be an issue with the amp? I bought it brand new from an authorized dealer so it seems like this is a weird thing to have happen but it's not the speakers. I don't have the luxury of testing out another amp but I've switched the speakers around to make sure it isn't the way they've been installed and it isn't the speakers. I'm tempted to just get a JL 300/2 and ditch the Alpine as I have a 500/1 running my sub. Any thoughts would be appreciated.

Also I've tried switching the RCA cables to see if maybe it was the HU but the right speaker still was the one bottoming out.

Boris_The_Blade · 6th April 2007, 12:38 AM

Just a hunch...take a meter and measure if there is any DC voltage on the amp outputs. Then post back with your findings.

impsick · 6th April 2007, 06:23 AM

are the polks dual voice coil? i would guess you covered this already but are terminals on the subs correct.

boom3198 · 6th April 2007, 06:54 AM

heres one way to level the outputs of the channels. we always had to do this when running tow sub amps to different woofers that way one doesnt blow and the other be fine. disonnect your speakers. take a volt meter and put one on the positive and ine on the negative output terminals. put the meter on ac voltage. take a test tone cd. (sine waves) and play a track on reapeat at about 60-70 hz. start turning the stereo up like this to the point to where you got the distortion from the speaker. take that voltage and do it to the other channel also. ajust these levels accordingly to get the same output voltage ac turn it back down, plug the speakers back in and your stereo will be perfectly in balance.

6th April 2007, 12:26 AM	#1
Stewart8989 diyAudio Member Join Date: Jul 2006	Weird Amp Problem I'm running a set of Polk SR 6500's off of a bridged Alpine Alpine MRV-F345. I have yet to get it professionaly tuned but what is making me scratch my head is when played loudly enough or songs with a lot of bass only one woofer will bottom out. I have yet to play it loudly enough to get the other woofer to bottom out. My first assumption was a problem with the speaker, so I switched the channels on the amp and the problem switched to the other speaker. So it's definitely not the speaker, all settings on the amp are the same for both channels. So could this be an issue with the amp? I bought it brand new from an authorized dealer so it seems like this is a weird thing to have happen but it's not the speakers. I don't have the luxury of testing out another amp but I've switched the speakers around to make sure it isn't the way they've been installed and it isn't the speakers. I'm tempted to just get a JL 300/2 and ditch the Alpine as I have a 500/1 running my sub. Any thoughts would be appreciated. Also I've tried switching the RCA cables to see if maybe it was the HU but the right speaker still was the one bottoming out.

6th April 2007, 06:23 AM	#3
impsick diyAudio Member Join Date: Dec 2006	are the polks dual voice coil? i would guess you covered this already but are terminals on the subs correct. __________________ "Nothing happens for a reason. There are just reasons why things happen." Quote me on that. http://stores.ebay.com/AudioGrade?_rdc=1

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6th April 2007, 12:38 AM	#2
Boris_The_Blade diyAudio Member Join Date: Mar 2007	Just a hunch...take a meter and measure if there is any DC voltage on the amp outputs. Then post back with your findings.

6th April 2007, 06:54 AM	#4
boom3198 diyAudio Member Join Date: Apr 2007	heres one way to level the outputs of the channels. we always had to do this when running tow sub amps to different woofers that way one doesnt blow and the other be fine. disonnect your speakers. take a volt meter and put one on the positive and ine on the negative output terminals. put the meter on ac voltage. take a test tone cd. (sine waves) and play a track on reapeat at about 60-70 hz. start turning the stereo up like this to the point to where you got the distortion from the speaker. take that voltage and do it to the other channel also. ajust these levels accordingly to get the same output voltage ac turn it back down, plug the speakers back in and your stereo will be perfectly in balance.

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