New speaker prob, need troubleshooting help

anonymoose · 24th July 2005, 03:24 AM

Hello

Finished my new speakers the other day and I've run into a problem. The imaging is shifted to the left towards the "good" speaker. I checked the level calibration on my amp and it became really obvious that something was wrong with the right speaker when it was playing white noise.

The left speaker makes a normal TCCCHHHHH type noise but the right is a softer PCCCHHH that is both quieter and in a lower pitch. If I boost the right speaker by around 2dB it sounds as loud but still doesn't have the TCH at the upper end of the woofer range that the left speaker has. As far as I can tell the tweeters sound the same when the woofers aren't hooked up. I swapped the woofers and the right speaker is still doing the same thing.

I don't have any testing equipment, not even a multimeter so the only troubleshooting I've been able to do is swapping drivers and changing wiring polarity to see if I screwed up somewhere. I can't get to the crossovers easily (design mistake on my part, I knew they should have been external!). However I'm 99% sure they are wired up the same and no components are out of place, unless something came loose somehow.

How can I find out what is wrong with the right speaker so I can fix it?

Thanks,
Anonymoose

knorke · 24th July 2005, 07:37 AM

Check the polarity of your tweeters...

anonymoose · 24th July 2005, 08:31 AM

Quote:

Originally posted by knorke
Check the polarity of your tweeters...

I've tried that, but as I mentioned the tweeters sound the same when the woofers aren't hooked up so I don't see how it can be a tweeter issue.

lufbramatt · 24th July 2005, 08:41 AM

If the tweeters are in phase (ie moving out when the woofers move out, and back in when the woofers move in) then the sound waves coming from both drivers around the point of crossover frequency will sum constructively and the response will be flat. If they are out of phase as a result of incorrect polarity, the waves will sum destructively and cancel each other out, resulting in a big dip in the response around the crossover frequency.

hope this helps, cheers, matt.

pinkmouse · 24th July 2005, 08:57 AM

Swap all drivers. If the problem stays in the same place, the crossover is faulty. If the problem moves, then the drivers are the issue.

anonymoose · 24th July 2005, 02:43 PM

Quote:

Originally posted by pinkmouse
Swap all drivers. If the problem stays in the same place, the crossover is faulty. If the problem moves, then the drivers are the issue.

Thats great but it doesn't really help me. How can I determine what component(s) are at fault?

lufbramatt: The crossover design has the tweeters wired in reverse.

24th July 2005, 03:24 AM	#1
anonymoose diyAudio Member Join Date: Jun 2005 Location: Home	New speaker prob, need troubleshooting help Hello Finished my new speakers the other day and I've run into a problem. The imaging is shifted to the left towards the "good" speaker. I checked the level calibration on my amp and it became really obvious that something was wrong with the right speaker when it was playing white noise. The left speaker makes a normal TCCCHHHHH type noise but the right is a softer PCCCHHH that is both quieter and in a lower pitch. If I boost the right speaker by around 2dB it sounds as loud but still doesn't have the TCH at the upper end of the woofer range that the left speaker has. As far as I can tell the tweeters sound the same when the woofers aren't hooked up. I swapped the woofers and the right speaker is still doing the same thing. I don't have any testing equipment, not even a multimeter so the only troubleshooting I've been able to do is swapping drivers and changing wiring polarity to see if I screwed up somewhere. I can't get to the crossovers easily (design mistake on my part, I knew they should have been external!). However I'm 99% sure they are wired up the same and no components are out of place, unless something came loose somehow. How can I find out what is wrong with the right speaker so I can fix it? Thanks, Anonymoose

24th July 2005, 08:57 AM	#5
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	Swap all drivers. If the problem stays in the same place, the crossover is faulty. If the problem moves, then the drivers are the issue. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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24th July 2005, 07:37 AM	#2
knorke diyAudio Member Join Date: Dec 2004 Location: Eichstetten	Check the polarity of your tweeters...

24th July 2005, 08:41 AM	#4
lufbramatt diyAudio Member Join Date: Jan 2005 Location: loughborough/ rochester	If the tweeters are in phase (ie moving out when the woofers move out, and back in when the woofers move in) then the sound waves coming from both drivers around the point of crossover frequency will sum constructively and the response will be flat. If they are out of phase as a result of incorrect polarity, the waves will sum destructively and cancel each other out, resulting in a big dip in the response around the crossover frequency. hope this helps, cheers, matt.

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