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Distortion? Bottoming out? Standing waves? Help!

post #1 of 6
Thread Starter 
Hello there, I'm back with a rather huge problem.

I recently picked up some older Creative speakers on clearance, couldn't resist a set of T7900s, a T3220 and a ProGamer G500 THX.

While the G500 works great, the other two 'budget sets' have some of an issue with the bass.

In good old Creative fashion, their idea of bass is an overbloated, boomy mess of a joke. So I tend to leave the bass levels at half or below on the controllers to achieve a semblance of sound quality.

However these two woofers tend to disagree. Here's the problem.
I'm driving them with the direct output from my Xiaomi Mi 3W, a smartphone known for it's rather low amplitude output stage.

The two woofers make unpleasant noises as soon as the volume goes anywhere near 'I need this to fill a living room' levels.

Grills off, they are visibly NOT reaching their Xmax, but they make these very loud and horrible 'BRRUUUUUUUUUUUUU' noises anytime the bass hits.

I'm sure that's no bottoming out because there's none of that sharp clacking associated with the former crashing into the pole plate.

Now I'm not sure if this is distortion rearing its ugly head, because these are cheap drivers, or is this what people call standing waves? Because the cabinets are thin, and unlagged.

To put into perspective, playing a 40Hz tone through the sub while gradually raising the volume results in an initial, very satisfying reverb through the room, until there comes a point it stops being 40Hz and turns into that BRUUUUUUUUUUUU. And as you go louder, the cone makes even more excursion but that BRUUUUUUUUUU doesn't get any louder.

What's going on, folks?
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post #2 of 6
I would suspect an impedance mis-match between the phone and the built in amps.

I get the same thing with an iPhone if I use a splitter to connect both the phone and a CD player to a Yamaha (M-35) amplifier.
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post #3 of 6
Thread Starter 
Quote:
Originally Posted by billbartuska View Post

I would suspect an impedance mis-match between the phone and the built in amps.

I get the same thing with an iPhone if I use a splitter to connect both the phone and a CD player to a Yamaha (M-35) amplifier.

Okay before we carry on I need to clarify that my text may have been more than just a bit confusing.

I am not using any of the sets concurrently. Each set of speakers is being tested on its own, directly fed by the phone without any splitters or extensions.
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post #4 of 6
Quote:
Originally Posted by Volvo View Post

Quote:
Originally Posted by billbartuska View Post

I would suspect an impedance mis-match between the phone and the built in amps.

I get the same thing with an iPhone if I use a splitter to connect both the phone and a CD player to a Yamaha (M-35) amplifier.

Okay before we carry on I need to clarify that my text may have been more than just a bit confusing.

I am not using any of the sets concurrently. Each set of speakers is being tested on its own, directly fed by the phone without any splitters or extensions.
I didn't mean that a splitter or an amp would cause the problem, but that an impedance mis-match would. Even just using the phone alone connected to the speakers there could be an impedance issue.

Have you tried using something other than the phone as the source?
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post #5 of 6
Thread Starter 
Quote:
Originally Posted by billbartuska View Post

I didn't mean that a splitter or an amp would cause the problem, but that an impedance mis-match would. Even just using the phone alone connected to the speakers there could be an impedance issue.

Have you tried using something other than the phone as the source?



Used my Stream 7 just now and yes it still happens. Even earlier in the volume range in fact, because the tablet has a far stronger output than the phone.
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post #6 of 6
Quote:
Originally Posted by Volvo View Post

Quote:
Originally Posted by billbartuska View Post

I didn't mean that a splitter or an amp would cause the problem, but that an impedance mis-match would. Even just using the phone alone connected to the speakers there could be an impedance issue.

Have you tried using something other than the phone as the source?



Used my Stream 7 just now and yes it still happens. Even earlier in the volume range in fact, because the tablet has a far stronger output than the phone.

Since phones and netbooks may have non standard audio outputs, I'd try hooking them to a computer's audio output. Either sound card or on board. That's the way their meant to be powered. If that fails to correct the problem, the they may just have been overdriven to much to long and the drivers and / or amps are fubarred.
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Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
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2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
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