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PostPosted: 03 Apr 2017, 11:52 
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Joined: 29 Jun 2016, 15:59
Posts: 59
Hi everyone,

I am building speakers cabinets and have heard that some glues/fillers are not safe and they may damage the drivers.

To glue the cabinets together I plan to use standard wood glue. I assume that this is safe.
But, what can I use to:
1) glue the polyester sound absorption sheets to the inside? I have some Wilsonart 600 Contact Adhesive used for wood cabinetry. Is this safe?
2) what about filling the inside joints to stop air leaks?

Any recommendation is appreciated. Thanks.


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PostPosted: 04 Apr 2017, 07:14 
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Joined: 05 Aug 2016, 14:35
Posts: 220
Danny wrote:
Hi everyone,

I am building speakers cabinets and have heard that some glues/fillers are not safe and they may damage the drivers.

To glue the cabinets together I plan to use standard wood glue. I assume that this is safe.
But, what can I use to:
1) glue the polyester sound absorption sheets to the inside? I have some Wilsonart 600 Contact Adhesive used for wood cabinetry. Is this safe?

The trick with glue is to allow the solvents to cure fully so that they will not attack any other materials in or around the enclosure. 3M makes any number of spray adhesives that will allow you to mount those sheets on irregular surfaces. They are "art safe", and so pretty benign when cured. Allow them to cure for 48 hours before sealing anything.

2) what about filling the inside joints to stop air leaks?

There are any number of electronics-rated silicon sealants (no acetic acid), there are neoprene-based rope-caulks, and butyl-based sealing tapes that remain soft pretty much forever, and there is always non-acidic hot-melt glue.

Do not use standard RTV silicon sealants or caulk - the acetic acid will attack anything brass, copper or bronze based.
If you are laminating the exterior (veneer), make sure that you use either a paper laminate or some other sealing material on the inside as well. This prevents cupping and swelling of the substrate, especially if it is MDF.

Try to find cabinet-grade substrate, after all, the cost of the 'wood' is a mere fraction of the cost of the drivers and your time in putting it all together.

http://www.bestmaterials.com/detail.asp ... AstE8P8HAQ

https://www.conservationmart.com/p-81-m ... lk-f4.aspx

https://www.onlinefabricstore.net/3m-su ... Ar6u8P8HAQ

Any recommendation is appreciated. Thanks.


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PostPosted: 05 Apr 2017, 11:24 
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Joined: 29 Jun 2016, 15:59
Posts: 59
Peter,

Thanks.


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PostPosted: 05 Apr 2017, 21:06 
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Joined: 04 Jun 2008, 20:59
Posts: 3854
Location: Arizona, USA
Hi, I suppose anything is possible, but I have not heard that before. One very good source for speaker information is
http://audioroundtable.com/forum/

Friendly folks and speakers are the main topic. Wayne is really good at assisting.

For my speaker projects I use wood glue much of the time and on occasion fasten stuff with hot melt glue. Great for the stuffing and such. I like the slower set type as it gives about a minute more working time. Polyester fiber fill is fine, fiberglass is too but a pain to work with. I have seen other stuff like medium density foam, and in vintage cabinets like the pair of Altec Lansing Magnificents I have they used wool matting. I personally avoid anything that sheds fibers though.

Good listening
Bruce

_________________
Some of my DIY Tube Amplifier Projects:


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PostPosted: 12 Apr 2017, 03:29 
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Joined: 17 Mar 2017, 03:45
Posts: 1
Good source for knowing when not to use silicone.


http://yarchive.net/electr/silicone_sea ... eness.html


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PostPosted: 17 Apr 2017, 12:05 
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Joined: 29 Jun 2016, 15:59
Posts: 59
Guys,

Thanks to all for the responses.


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