Hi all, I’m new to this group and was hoping I can an answer to a problem that’s stumping me. I have Sansui 9090 receiver connected to a pair of JBL L88 2-way speakers. Today, I noticed that my treble driver has no sound coming out of both speakers. The minimum to maximum high frequency knob on back of each speaker / the crossovers are also not responding. I went ahead and swapped out two different sets of speakers, a set of Bose 2-way speakers and a set of Sansui 4-way speakers. I’m still not getting any sound out of the treble drivers on any of the other speakers although the mid-range drivers seem fine in my 4-way speakers. I would assume the problem would be with the JBL speakers so why am I also having the same problem with the other speakers? Could it be the recriver? I’m stumped. Any advice is always. Thanks in advance.
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No treble coming from several sets of speakers.
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What Seely said ^
Do you have another source to connect the speakers to ? Have you used a paper towel tube against the tweeters and your ears to verify that none of them are functional ? Did the tweeters ever work ?
Seems highly unlikely that all your tweeters would be blown out at the same time.
In my experience a receiver either works or doesn't work. I've never heard of one that can only produce a low frequency signal. I suppose it's possible that something went wrong and it sent a dc signal and fried all the tweets.
Hopefully somebody smart will chime in. Best of luck.
In the meantime, check out this video. Could be the problem....
Do you have another source to connect the speakers to ? Have you used a paper towel tube against the tweeters and your ears to verify that none of them are functional ? Did the tweeters ever work ?
Seems highly unlikely that all your tweeters would be blown out at the same time.
In my experience a receiver either works or doesn't work. I've never heard of one that can only produce a low frequency signal. I suppose it's possible that something went wrong and it sent a dc signal and fried all the tweets.
Hopefully somebody smart will chime in. Best of luck.
In the meantime, check out this video. Could be the problem....
Last edited:
Pyrrho
Super Member
It can be the receiver. I presume you looked at the controls, and don't have the treble turned all the way down and no high filter engaged? Typically, those would only reduce the treble, and not eliminate it, but if they reduced it enough, it might convince you that there is no treble.
If you have another receiver or amplifier to try with the speakers, that would be a good thing to try, as already suggested. You may also want to try a different source, to eliminate that as the potential problem. Maybe a CD player or whatever, as long as it is a source that has good treble (like a CD player should).
Of course, if you are someone who listens at high levels, it is possible that you blew out all of the tweeters on all of your speakers from overdriving your amplifier. So none of the tweeters work on any of your speakers, if you did that. Or it could be that there is a problem with your amplifier that is causing it to not output treble. Or it could be that you no longer can hear high frequencies, and they are all working fine, but your hearing simply does not allow you to hear treble anymore (perhaps from too many loud noises in your life).
Or if you are using the same source with everything, then it could be a problem with your source not having any treble.
I think that covers all of the possibilities; either your source, your receiver, your speakers, or your ears.
What it cannot be is a problem with just the JBL speakers, since you have the problem with your other speakers as well. Trying a different source and a different receiver/amplifier are the first things to try (after making sure the treble control is not turned down all the way on your receiver, and the high filter is not engaged).
If you have any test equipment (and know how to use it), you could pull a tweeter and measure the voice coil, to see if the voice coil is an open circuit or not. But I am guessing you don't have that as an option.
If you have another receiver or amplifier to try with the speakers, that would be a good thing to try, as already suggested. You may also want to try a different source, to eliminate that as the potential problem. Maybe a CD player or whatever, as long as it is a source that has good treble (like a CD player should).
Of course, if you are someone who listens at high levels, it is possible that you blew out all of the tweeters on all of your speakers from overdriving your amplifier. So none of the tweeters work on any of your speakers, if you did that. Or it could be that there is a problem with your amplifier that is causing it to not output treble. Or it could be that you no longer can hear high frequencies, and they are all working fine, but your hearing simply does not allow you to hear treble anymore (perhaps from too many loud noises in your life).
Or if you are using the same source with everything, then it could be a problem with your source not having any treble.
I think that covers all of the possibilities; either your source, your receiver, your speakers, or your ears.
What it cannot be is a problem with just the JBL speakers, since you have the problem with your other speakers as well. Trying a different source and a different receiver/amplifier are the first things to try (after making sure the treble control is not turned down all the way on your receiver, and the high filter is not engaged).
If you have any test equipment (and know how to use it), you could pull a tweeter and measure the voice coil, to see if the voice coil is an open circuit or not. But I am guessing you don't have that as an option.
Thank you. I appreciate your response and advice.
So, did you figure it out yet ?
I’m getting the receiver checked out next week. He will check the oscillation, resistors and protection circuits and and anything else that could cause this. After I get the green light, I’ll look into replacing the tweeters. Thanks for following up.
