Sub Vibration Noise Problem - Page 2

hernanstafe · 19th March 2007, 12:20 AM

well the driver moves quite a lot, but even at low volume it vibrates. I'm almost sure it's not the driver, cause it sounds like wood vibrating. The sound can be compared with the sound an enclosure makes when the back panel is made of thin wood and it vibrates in the center. It sounds like that, except this wood is REALLY thick.
Should i cover the inside with some sound-prove material?

MJL21193 · 19th March 2007, 12:37 AM

Once again, what wood is it made with? One layer? Two layers? It's not a hugh driver, so there is some construction problem.
I have 2 18" in a 60litre sealed box driven by 600++ watts peak and there is not a peep of sound ( except walls, floor, ceiling , furniture, the Earth shaking, rattling).

hernanstafe · 19th March 2007, 12:41 AM

Well idk the name of the wood (in english, i speak spanish here), it's artificial, it's made of wood dust mixed with glue and pressed, it's used to make speakers here, i have 2 15" boxes made with it and they work just fine, so i seriously doubt it's the wood

MJL21193 · 19th March 2007, 12:51 AM

Yeah, that would be MDF. You mentioned a lot of screws. Screws can split MDF along the edge. Did you use lots of glue? Have to build these things like submarines or they'll talk to you.

hernanstafe · 19th March 2007, 01:01 AM

Well that's one thing i didn't do. I didn't use glue...can that be it? the screws are really tight tho

MJL21193 · 19th March 2007, 01:27 AM

I generally avoid screws in MDF. I use a nail gun with long thin nails and TONS of glue. What you could do if you have clamps big enough is to clamp it and then try it. If it stops rattling then you have found the problem.

hernanstafe · 19th March 2007, 02:03 AM

why not screws if i may ask?

MJL21193 · 19th March 2007, 02:19 AM

Like I said before, screws will split MDF even if you drill the correct size pilot hole. When I do use them I am careful to keep them far from the end and try to keep them spaced apart. Yellow carpenters glue makes an extremely strong joint, especially if the parts fit together well.

hernanstafe · 19th March 2007, 02:50 AM

got it! i'm gonna see what i can do. thanks a lot for that! the sad part is that i'll have to dissasemble it

richie00boy · 19th March 2007, 09:03 AM

I'd say the problem is that you haven't glued it. Glue will help seal the box.

19th March 2007, 09:03 AM	#20
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	I'd say the problem is that you haven't glued it. Glue will help seal the box. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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19th March 2007, 12:20 AM	#11
hernanstafe diyAudio Member Join Date: Feb 2007 Location: Argentina	well the driver moves quite a lot, but even at low volume it vibrates. I'm almost sure it's not the driver, cause it sounds like wood vibrating. The sound can be compared with the sound an enclosure makes when the back panel is made of thin wood and it vibrates in the center. It sounds like that, except this wood is REALLY thick. Should i cover the inside with some sound-prove material?

19th March 2007, 12:37 AM	#12
MJL21193 Account disabled at member's request Join Date: Mar 2007	Once again, what wood is it made with? One layer? Two layers? It's not a hugh driver, so there is some construction problem. I have 2 18" in a 60litre sealed box driven by 600++ watts peak and there is not a peep of sound ( except walls, floor, ceiling , furniture, the Earth shaking, rattling).

19th March 2007, 12:41 AM	#13
hernanstafe diyAudio Member Join Date: Feb 2007 Location: Argentina	Well idk the name of the wood (in english, i speak spanish here), it's artificial, it's made of wood dust mixed with glue and pressed, it's used to make speakers here, i have 2 15" boxes made with it and they work just fine, so i seriously doubt it's the wood

19th March 2007, 12:51 AM	#14
MJL21193 Account disabled at member's request Join Date: Mar 2007	Yeah, that would be MDF. You mentioned a lot of screws. Screws can split MDF along the edge. Did you use lots of glue? Have to build these things like submarines or they'll talk to you.

19th March 2007, 01:01 AM	#15
hernanstafe diyAudio Member Join Date: Feb 2007 Location: Argentina	Well that's one thing i didn't do. I didn't use glue...can that be it? the screws are really tight tho

19th March 2007, 01:27 AM	#16
MJL21193 Account disabled at member's request Join Date: Mar 2007	I generally avoid screws in MDF. I use a nail gun with long thin nails and TONS of glue. What you could do if you have clamps big enough is to clamp it and then try it. If it stops rattling then you have found the problem.

19th March 2007, 02:03 AM	#17
hernanstafe diyAudio Member Join Date: Feb 2007 Location: Argentina	why not screws if i may ask?

19th March 2007, 02:19 AM	#18
MJL21193 Account disabled at member's request Join Date: Mar 2007	Like I said before, screws will split MDF even if you drill the correct size pilot hole. When I do use them I am careful to keep them far from the end and try to keep them spaced apart. Yellow carpenters glue makes an extremely strong joint, especially if the parts fit together well.

19th March 2007, 02:50 AM	#19
hernanstafe diyAudio Member Join Date: Feb 2007 Location: Argentina	got it! i'm gonna see what i can do. thanks a lot for that! the sad part is that i'll have to dissasemble it