Plywood VS MDF for speaker construction

augerpro

Member
2006-08-27 11:02 am
or should I glue a layer or carpet with rubber underlay in between?
I would just use the adhesive I posted above. I you look at my tests I put a middle layer of cork and XPS foam in the middle and it wasn't better than the simple CLD I ended up recommending. So I'm not sure using rubber would be much better either. It might be like the Nidacore where it was ever-so-slightly better, but way more of a hassle to build.
 
  • Like
Reactions: 1 user
A few thoughts, as I use mdf and BB.
BB is nice, not perfect (could be voids) and rough on saw blades / router bits.

MDF, so many grades out there. A large box store chain ad cut/pasted a premium grade photo on their website and I went running down there.
Getting a good laugh now because it was the worst recycled cardboard product I've ever seen.

That was enough for me to order this wonderful product, MEDEX
  • Moisture resistant
  • Full 3/4"
  • A solid/dense product
  • Machines beautifully
  • 1" oversized
Although the best benefit is the sawdust doesn't fly around the room. I did a lot of cutting/shaping yesterday and something was missing - all that fine dust in the air!

Cost $111 vs the box store recycled cardboard at $59
[Was able to squeak out 4 boxes from one sheet]

MEDEX.jpg


There is a mom/pop lumber yard around the corner, they were sell a high grade mdf shelving board 12" and 16", almost as good as this.
They may have sold it all by now, next week I'm going back up and look for old stock, sample in hand!
 

wasabii

Member
2021-11-30 10:48 pm
Wear an N 95 3M, and well ventilate that room $0.02.

There is something I do dislike about ply woods. The slivers are wicked and plentiful after cutting and before you edge sand. If its covered with wood veneer especially. Even when being carful your bound to get nailed by at least one.
 

wasabii

Member
2021-11-30 10:48 pm
You need to use better quality saw blades and/or a better quality saw...the edge of a high grade plywood panel either ripped or crosscut should be smooth and splinter free and ready for glue up.
Its not my first time with a table saw or cutting plys. In this case its more a combination of the hardness and type of the species combined with the way the acrylic cuts. Everyone's a comedian. Owell, shrugs.
 

myleftear

Member
Paid Member
2017-09-10 6:33 pm
Luzern
Another trick I was told (a long time ago), wich is tricky by itself, is to precut the veneer with a good knife along the cutting line… this must be done very precisely but gives an absolutely splinterfree edge. Since it is lacquered, you could put a masking-tape for better visibility of the marking without risking to „rip off“ the veneer when removing that tape…
 
@wasabii I had no intention of introducing comedy to a serious woodworking discussion. This is an issue of both productivity and safety. A ragged cut suggests either a dull/chipped blade or one mismatched to the cut and material, a saw arbor with runout or alignment problems, a misalignment between blade and fence, or an inappropriate feed rate. Prefinished ply should cut as well or better than raw ply. Addressing the underlying causes can both improve safety and eliminate the extra steps required to clean up the edges. It's tempting to just push through with the work but when a tool talks to you by producing substandard results it makes sense to listen by getting to the bottom of the root cause and fixing it.
 
  • Like
Reactions: 1 user

JohnnoG

Member
2019-01-19 9:47 am
I have followed a variety of speaker builds for quite a few years and have seen that over the past few years Densified Wood Boards are becoming more popular as a Baffle Material.
I have not seen a reference to it in this thread and have chose to add it to the materials being made known.

The link and a Google Search will show more of its usage.

The material is not for those on a tight budget, as it is most likely the most expensive option, but it does show up as used material from time to time as it is used in various industries.

Densified Wood Products such a Panzerholz and Permali are being used both Commercially and in DIY projects, it does appear to have a properties that suits being used as a front baffle.

https://www.monoandstereo.com/2014/11/interview-with-rainer-weber-of-kaiser.html
 
Last edited: