Compact 15" sub HDF or MDF? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 7 Old 11-08-2019, 01:24 PM - Thread Starter
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Compact 15" sub HDF or MDF?

Hi,
i am in the process of drawing up CAD drawings of a somewhat compact 15" subwoofer (2,7 cubic feet internal).
This drawing will be CNCed at a community creator space workshop and i have the possibility to choose what material to make the subwoofer out of.
I had already decided on 19mm MDF but then a friend of mine (that helped with the drawing) mentioned HDF. Around here that particular HDF product is called Valchromat.

Do anyone have any experience using this?
How is it to work with and does it actually contribute to the sound quality of the subwoofer?

My 2.1: Minidsp2x4 HD,Hypex UCD400HxR,SI HT-18,HTM-10
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post #2 of 7 Old 11-08-2019, 01:30 PM
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I haven't used Valchromat, but the writeup I found indicates it's very similar to MDF.

As long as the box is properly built/braced there should be no audible differences between one made of Valchromat or MDF (or decent plywood).

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post #3 of 7 Old 11-08-2019, 01:36 PM
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Unless you are moving this thing around a lot, I do not see a large benefit to the HDF vs the MDF. Material characteristics look mostly the same on paper.

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post #4 of 7 Old 11-08-2019, 02:26 PM
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HDF is primarily used for template making as it will hold its edge better than standard MDF. It is heavy and is more expensive. IMO there isn’t a solid reason to go seeking it over the lighter stuff.


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post #5 of 7 Old 11-08-2019, 02:50 PM
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I'll argue for the HDF product. Erich from the DISYG supplies the HDF type product for it's superior edge qualities (among other reasons I am sure) for front baffles and other flat packs. When I built my Cinema-10 speakers I also asked a buddy and cabinet maker if he could order something higher quality than typical MDF. He located a Super Refined MDF product at ~$60 a 4x8 sheet which I felt was a steal with how clean his machines cut the edge and how easy it was to assemble. I realize wood glue is forgiving and either product will soak up the wood glue just as well. Having seen/used MDF boxes for years when making car subwoofer cabinets, I'd rather use the higher quality product where cost justifies.
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post #6 of 7 Old 11-08-2019, 03:20 PM
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I’ll ask how will you finish the cab? If veneer, use the product with the better edge. I’ve veneered standard mdf and the flat packs supplied by Erich at diysg, and whatever Erich is using is far better as the edges don’t suck up 5 coats of contact cement. It makes for a smoother finishing project. I’d imagine if painting, it would be similar, as the edge will need less attention overall.
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post #7 of 7 Old 11-09-2019, 02:39 AM - Thread Starter
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I was planning on finishing them similiar to my HTM-10 build. With a watered down oil sealing primer and watered down oil paint meant for interior painting.
I am not sure about how good the quality of the MDF I can get is, but I think it is one notch above the most standard type at least. They have a woodshop inside the creator space that gets its material directly from the supplier.

Thanks for all help so far!

My 2.1: Minidsp2x4 HD,Hypex UCD400HxR,SI HT-18,HTM-10
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