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Go Back   Blu-ray Forum > Audio > Subwoofers


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Old 04-08-2016, 10:43 PM   #1
lghaze42 lghaze42 is offline
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Default occasional sub rattle

I have a pair of Technics THX subs that started to rattle at times.Yesterday watching the new Star Wars BD it happened several times.In some scences bass vibrated the sectional---no rattle.Then in some others there it was.These are dual subs with two 8" subs with 10" passive radiators.I inspected one of the speakers last week,no rips in the surrounds.Anyone know what might be the problem?
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Old 04-09-2016, 04:28 AM   #2
Krelldog1977 Krelldog1977 is offline
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Quote:
Originally Posted by lghaze42 View Post
I have a pair of Technics THX subs that started to rattle at times.Yesterday watching the new Star Wars BD it happened several times.In some scences bass vibrated the sectional---no rattle.Then in some others there it was.These are dual subs with two 8" subs with 10" passive radiators.I inspected one of the speakers last week,no rips in the surrounds.Anyone know what might be the problem?
This audible rattle may be originating from somewhere other than the speaker possibly....not from the driver. Exactly when ( times ) in the new SW movie did the rattles occur?

You have some really cool gear, I must say. Try playing music with consistent bass hits to give the speakers a workout,. ..If there is a rattle you should have enough time to isolate the sound exactly where it originates. Keep us posted- good luck!
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Old 04-09-2016, 05:42 AM   #3
lghaze42 lghaze42 is offline
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[QUOTE=Krelldog1977;12087629]This audible rattle may be originating from somewhere other than the speaker possibly....not from the driver. Exactly when ( times ) in the new SW movie did the rattles occur?

You have some really cool gear, I must say. Try playing music with consistent bass hits to give the speakers a workout,. ..If there is a rattle you should have enough time to isolate the sound exactly where it originates. Keep us Thanks..I can't remember exactly but I listened to a DVD Audio disc the other day and heard no rattle.I put my head in front of the speaker and that is where the rattle is coming from.Both subs are doing it at the same time.
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Old 04-09-2016, 02:42 PM   #4
Blu-Dog Blu-Dog is offline
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[quote=lghaze42;12087802]
Quote:
Originally Posted by Krelldog1977 View Post
This audible rattle may be originating from somewhere other than the speaker possibly....not from the driver. Exactly when ( times ) in the new SW movie did the rattles occur?

You have some really cool gear, I must say. Try playing music with consistent bass hits to give the speakers a workout,. ..If there is a rattle you should have enough time to isolate the sound exactly where it originates. Keep us Thanks..I can't remember exactly but I listened to a DVD Audio disc the other day and heard no rattle.I put my head in front of the speaker and that is where the rattle is coming from.Both subs are doing it at the same time.

They're clipping, from being overdriven. Ported subs fall victim to this all the time, but sealed subs, too. Some knob-twiddling will probably eliminate it.


At the outset, remember where the gain or volume is set. Play the same passage that is clipping, again, as you slowly lower the gain, until it's gone. You like that loudness, but you want to eliminate rattling noises. Note where it goes away.


Then return you setting to where it was, and do the same to any frequency setting - higher or lower - and see if that eliminates it. This may not work, but use your judgement - all amps are different, and it may be "unloading" from insufficient power when it's playing at a certain frequency. It will change, getting better or worse depending on the situation. Usually the higher the frequency, the more power it wants, but try both.


Play with both the gain/volume, and the frequency. It sounds like the speaker driver itself is doing fine, and it's the amp that's giving you the problem. In your case, it's just an overdriven amp, most likely. And test all this with the same source - a deep one - and after you're happy with it, try others.


Good luck!
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Old 04-09-2016, 04:33 PM   #5
lghaze42 lghaze42 is offline
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[quote=Blu-Dog;12088469]
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Originally Posted by lghaze42 View Post


They're clipping, from being overdriven. Ported subs fall victim to this all the time, but sealed subs, too. Some knob-twiddling will probably eliminate it.


At the outset, remember where the gain or volume is set. Play the same passage that is clipping, again, as you slowly lower the gain, until it's gone. You like that loudness, but you want to eliminate rattling noises. Note where it goes away.


Then return you setting to where it was, and do the same to any frequency setting - higher or lower - and see if that eliminates it. This may not work, but use your judgement - all amps are different, and it may be "unloading" from insufficient power when it's playing at a certain frequency. It will change, getting better or worse depending on the situation. Usually the higher the frequency, the more power it wants, but try both.


Play with both the gain/volume, and the frequency. It sounds like the speaker driver itself is doing fine, and it's the amp that's giving you the problem. In your case, it's just an overdriven amp, most likely. And test all this with the same source - a deep one - and after you're happy with it, try others.


Good luck!
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Old 04-09-2016, 04:38 PM   #6
lghaze42 lghaze42 is offline
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Thanks.I was also thinking it might have something to do with the amps.Although it seems odd that both of them would act up.I don't think the amps were made by Technics.If I could figure a way to run the power to my Technics SE-A5MK2 power amp I would hook them to my B speakers and use it to power them.150 wpc, and would also be able to control the subs' volume with the preamp.
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