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Old 26th April 2010, 04:53 AM   #1
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Default Tweeter sensitivity problem

i have 1 pair of 2 way speakers that uses active LR xover. Midrange and tweeters driven by identical and individual LM1875 based amp.

I am having problem on that the issue is the right tweeter treble is always louder than the one on the left tweeter (sometimes same volume, that means on some songs or movies or games). swapping amps (Left and right channel) didn't help. how 2 solve this problem? Anyone ? thanks:
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File Type: jpg Left + Right speaker.jpg (345.8 KB, 136 views)
File Type: jpg tweeter back + front.jpg (356.6 KB, 130 views)
File Type: jpg midrange + tweeter.jpg (369.9 KB, 125 views)
File Type: jpg midrange Front + Rear.jpg (175.6 KB, 116 views)
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Old 27th April 2010, 01:38 AM   #2
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L-pad (attenuate the louder one)...but I'd look to unit failure? Check the resistance with a multimeter, and inductance if you have an LCR meter handy.
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Old 27th April 2010, 02:19 AM   #3
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You probably either have a happy tweeter (to loud) or a defective tweeter (to quiet.) Tweeters should be matched pairs anyway and so should mids. Buy another tweeter if you can or even two more and use the best matched ones.
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Old 27th April 2010, 03:46 AM   #4
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Those are very budget tweeters... I've seen similar from 50 cents up to $7. They are likely just mismatched. Since it is active just attenuate the amp in front of the quiet tweeter.

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Old 27th April 2010, 04:16 AM   #5
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When I said matched I meant stereo pair speakers should use drivers that are matched in frequency response and phase response and level if possible. Around here we measure tweeters in groups of 20 and usually get about 5 matched pairs from any 20 and 10 that get run again. Some tweets are just strange and are sold off as odd balls or used in cars or other non-real stereo applications.
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Old 27th April 2010, 06:45 PM   #6
anatech is offline anatech  Canada
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Hi sumaudioguy,
Quote:
Around here we measure tweeters in groups of 20 and usually get about 5 matched pairs from any 20 and 10 that get run again.
That's all well and fine, except that you are probably not using extreme budget parts for one. For two, diyaudio ... I'm pretty sure the O.P. bought one pair to use, not 10 or 20 pcs. He's just a guy building a pair of speakers.

Hi Dave,
Quote:
They are likely just mismatched.
I'm in complete agreement with you, but the extreme difference in level might point to the quiet tweeter being defective. The voice coil may be trapped or the suspension is far too stiff. There is a pretty high chance the frequency response has been affected. The doctor says ... replace it with a new one.

Quote:
Since it is active just attenuate the amp in front of the quiet tweeter.
You probably meant, "Since it is active just attenuate the amp in front of the loud tweeter". It's really nice that it's an active system. That's really the only way to fly.

-Chris
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Old 28th April 2010, 12:48 AM   #7
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Default tweeter sensitivity problem

should i sweep white noise through my speakers (mid and tweeters) before i fiddle the amp gain (attenuate) or replace my tweeter? Speakers are cross overed at 5000Hz. Should i check the midrange also?
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Old 28th April 2010, 02:48 AM   #8
tinitus is offline tinitus  Europe
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Are you absolutely certain your active xo is working properly

Maybe try and switch tweeters around (channels)

Also, sometimes what might "sound" like tweeter problems actually comes from the mid driver
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Old 28th April 2010, 04:47 AM   #9
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Default tweeter sensitivity problem

I've tried with another pair of 2 way speaker (with bi amp connectors) and it works fine. I think it is most probable is either the tweeter sensitivity or the tweeter is defective. May be i will get it fixed by today or tomorrow.
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Old 28th April 2010, 07:32 AM   #10
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Smile tweeter sensitivity problem

I've solved the problem by replacing the left channel tweeter. now both channel treble sounded (almost) equal. Thanks to everyone who give help and advice to me.

thank
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