I'm constructing a fullrange dipole (F/R HDS + 831882 + 2x RSS390HF) and want to make the baffle as acoustically inert as possible. What material sandwiched between mdf would provide the best damping?
Should I sandwich the material between every sheet of mdf or simply in the middle of the sheets?
Thanks, Thad
Should I sandwich the material between every sheet of mdf or simply in the middle of the sheets?
Thanks, Thad
Just to be clear, you want to sandwich some type of Solid Core material between layers of MDF. You are not talking about fiberglass or Poly-wool type dampening?
I'm no expert in this field, but the only thing I can think of to sandwich with MDF is more MDF. You could build out of 3/4 inch MDF, then glue 1/2 inch MDF to the inside. Plus laminate 3/4 with 1/2 for the front and possibly the back as well (or laminate two 1/2 sheets for the front and back). That would give on one big solid heavy cabinet.
It will be interesting to see if other have better ideas.
Steve/BlueWizard
I'm no expert in this field, but the only thing I can think of to sandwich with MDF is more MDF. You could build out of 3/4 inch MDF, then glue 1/2 inch MDF to the inside. Plus laminate 3/4 with 1/2 for the front and possibly the back as well (or laminate two 1/2 sheets for the front and back). That would give on one big solid heavy cabinet.
It will be interesting to see if other have better ideas.
Steve/BlueWizard
Green Glue?...
www.greengluecompany.com
Use it between two sheets of 3/4" MDF, then screw them together as needed.
Could use some other kind of damping material on the back of the baffle as well.
Other than that, I guess use as much MDF as possible to add mass?
Or, use expensive solid hard woods, which has its own disadvantages as well.
Anyone else? I'm interested in OB, so I'm currently learning and gathering ideas.
www.greengluecompany.com
Use it between two sheets of 3/4" MDF, then screw them together as needed.
Could use some other kind of damping material on the back of the baffle as well.
Other than that, I guess use as much MDF as possible to add mass?
Or, use expensive solid hard woods, which has its own disadvantages as well.
Anyone else? I'm interested in OB, so I'm currently learning and gathering ideas.
I built baffles out of polymer concrete feeding troughs (cuts had to be done with water beams). Nature`s equivalent would be sandstone.
Polymer concrete
Hi all,
\
I've made some composite panels using molding technique (so no need to cut is) following the "opposite moduli" principle (epoxy+quartz+rubber --
http://www.diyaudio.com/forums/showthread.php?threadid=85375 ). The panels seem very inert, but I have not yet used it for making a flat open baffle, as I'm just finishing the wooden one.
All the best,
Alain
Hi all,
\
El' Ol, is did you made and epoxy concrete ? And how does the sound is compared to a wooden panel ?el`Ol said:
I've made some composite panels using molding technique (so no need to cut is) following the "opposite moduli" principle (epoxy+quartz+rubber --
http://www.diyaudio.com/forums/showthread.php?threadid=85375 ). The panels seem very inert, but I have not yet used it for making a flat open baffle, as I'm just finishing the wooden one.
All the best,
Alain
Hello Alain!
With wood you have more of the "paper cone magic", polymer concrete is more neutral. Here is my source:
http://www.durofarm.de/
With wood you have more of the "paper cone magic", polymer concrete is more neutral. Here is my source:
http://www.durofarm.de/
Here's a webpage from someone who did a research on different enclosure materials, you probably won't be able to read it because it's in Dutch, use a translator like http://babelfish.altavista.com/
http://www.hsi-luidsprekers.nl/Kastmaterialenonderzoek.htm
Don't forget the bracing !
http://www.hsi-luidsprekers.nl/Kastmaterialenonderzoek.htm
Don't forget the bracing !
The sand idea is intriguing, I may have to look into that.
Has anybody ever used 3M™ Conformable Sound Management Film Tape 9343?
Keep the ideas coming! At the current moment, I'm planning on stacking 8 3/4" sheets of mdf together (thickness is necessary because each HDS is ~2" deep, so 2x2=4, >4") and sandwiching something in between.
Has anybody ever used 3M™ Conformable Sound Management Film Tape 9343?
Keep the ideas coming! At the current moment, I'm planning on stacking 8 3/4" sheets of mdf together (thickness is necessary because each HDS is ~2" deep, so 2x2=4, >4") and sandwiching something in between.
Injection-molded polypropylene 😀
I experimented with a 12mm thick sheet of polypropylene once and it gave the most neutral-sounding "tap test" results that I've ever heard. Even a solid brick wall sounds more "musical".
The only problem was that it's absolute b**** to cut to the desired shape.
Cheers,
I experimented with a 12mm thick sheet of polypropylene once and it gave the most neutral-sounding "tap test" results that I've ever heard. Even a solid brick wall sounds more "musical".
The only problem was that it's absolute b**** to cut to the desired shape.
Cheers,
CeramicMan said:
Where did you acquire a sheet of polypropylene? Is it expensive? As far as shaping, I would sandwich it between the sheets of MDF and then cut the block of MDF to the desired shape.
thadman said:
I got a scrap piece for a ridiculously high price from a New Zealand factory shop specializing in industrial plastic supplies. Around US$40 for 0.4m*0.6m.
If you can acquire some polypropylene (many of those "factory shop" type outfits don't appear to have a web presence, so it may pay to phone around), ask if they provide a cutting service (yes it's that bad). And I'd definitely try using it on it's own without the MDF if possible.
A big chunk of lead firmly attached to the baffle or better yet, as part of a lamination of materials, does great things for damping.
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