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Infrequent kazoo?

Sensel

Sensel

New Member
I have a pair of Pioneer SP-BS22 bookshelf speakers. I like them.
But, I am wondering, sometimes, when a sax or similar wind instrument is on, usually in a more intense finishing part of a musical jazz piece, the audio from them vibrates in a distortion. Kind of like they can't seem to handle the particular sustained vibration found in that instrument in that intense moment.
A normal sax solo, seems to be OK. It is just a certain kind of vibration, sorry, don't know what else to call it, seems to cause a “kazoo” like version of that one instrument.
Could it also be my amp? That same amp also drove a pair of MMGs fine and they never did that. So I am thinking it is the SP-BS22s. It is playing right now just fine. It is a rare occurrence but, disconcerting.
Other then that, these speakers are a friken bargain for the sound quality. Especially on sale. Although, I could do without the pill shaped cover that is hard to get off and even harder to get back on.
 
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Sounds like either a cabinet buzz (something loose, like a cabinet corner/edge or something in the crossover or a loose screw on a driver or such), or a driver buzz (a woofer that's got an intermittently rubbing voice coil, like from a slightly warped woofer frame or such).

Check for ANYTHING loose, on the cabinet, drivers, crossover and such. Even check the input terminals-I've had a case where a loose binding post (the nut not screwed down tightly onto the wire or the post not tightly screwed into the panel) had a mechanical buzz. Process of elimination of sources of buzz, should eventually lead to what's causing that...

Regards,
Gordon.
 
GordonW said:
Sounds like either a cabinet buzz (something loose, like a cabinet corner/edge or something in the crossover or a loose screw on a driver or such), or a driver buzz (a woofer that's got an intermittently rubbing voice coil, like from a slightly warped woofer frame or such).

Check for ANYTHING loose, on the cabinet, drivers, crossover and such. Even check the input terminals-I've had a case where a loose binding post (the nut not screwed down tightly onto the wire or the post not tightly screwed into the panel) had a mechanical buzz. Process of elimination of sources of buzz, should eventually lead to what's causing that...

Regards,
Gordon.
Click to expand...

I'm 99% sure it is coming from the cones. Both.
 
Might be aging driver(s) distorting. I'm also here to agree that would be an amazing group or album title.
 
I had that problem with some bose speakers I once had.The plastic pegs that hold the grills on were not a tight fit and would rattle at certain frequencies,wrap some tape around them and press on.
 
To identify the source of the sound(s), you'll need to run a manual frequency sweep of each speaker individually. To do this, download one of the free signal generators such as Home Theater Wizard for the Windows platform. Use the sine wave signal generator to move up and down the frequency spectrum slowly while you have the speaker up on a table or workspace where it it on ear level with you. Adjust the frequency and volume until you hear the buzzing. You should be able to go up and below the sound to make it appear at will.

Once you've got it nailed, press, poke, prod or otherwise move the cabinet or driver and its cone to see if you can make the sound change or disappear. If it is a driver that's the source, pull it out of the cabinet but leave it hooked up and confirm its inside the driver and not just a mechanical linkage issue.

If you've narrowed it down to the driver, however, your options become more complicated. Essentially, all you're doing is identifying the root cause with this technique. You'll still need to figure out how to source new drivers if that's where the problem lies.

Cheers,

David
 
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