How to Build a DIY Acoustic Diffuser QRD 13 Kit – www.AcousticFields.com
Our DIY sound diffuser QRD 13 kit is based
on prime number 13 so we have 12 wells, dividers, rears, side pieces, back pieces, the horizontal
dividers. The whole thing is designed so that all you have to do is get some glue, the right
kind of course, and assemble the unit. No screwing required, everything is pre-cut for
you. The back and the top and the bottom will support the well dividers and the horizontal
dividers. Let’s get started looking at how to put it all together. We’re going to start
with the back piece first and we’re going to place glue in each one of the wells and
then position our dividers in there. In the essence of saving time, we’ll speed this process
up. Carl actually doesn’t go that fast but we’ll speed it up anyway. Here we’re putting
in the well dividers and they’re designed to stand on their own, gives you a little
more flexibility if you’re doing it yourself. However, the next step where we’re putting
on the top and the bottom that Carl is going up now, would be a good idea to have somebody
to help you and get your tape out because you’re going to have to secure the units,
the top and the bottom pieces with tape. So you can see, one person it’s a little bit
of a struggle, trying to get everything lined up. The glue doesn’t dry really fast but you
want to keep moving and not get drawn back too far so you get another person to help
you. Put a piece of tape to hold it all together while the glue dries. Do the other section.
Of course this one will go a lot easier because it’s already set in there for you. A little
bit more tape. Now we’re going to work with the sides, same procedure. Put a little tape
to hold it. Obviously those of you who that have clamps could use clamps. Those work just
as good. There’s the sides. There’s the finished unit without the horizontal well dividers
so each well now is 12 ½ inches deep. Now we have to break them up into quarter wave
length gaps and get the diffusion sequence that we want out of our 13. To do that, we’re
going to use supporting blocks, the blocks you cut to the right height so that when you
prep the horizontal piece in the well, it will be at that right height. Carl’s working
off the drawings that are provided with the kit; inserting the block into the well width.
Usually we do on these 4 fault ones, 3 blocks, one on each end and one in the middle. Simply
lay the horizontal piece in there. Let it dry, of course, before you tilt it back up.
Repeat the same procedure with the other wells. We’ll go to the other side and put those blocks
in. I believe this first well is at a 1 inch depth. That’s the depth, we’ll make that one.
Over to the other side, because we all know the quadratic diffusers, the sequence repeats
itself to the middle and then starts over. There you go, there’s your two horizontal
end wells completed and you just simply repeat the process, following your drawing for all
the other well depth. As you can see these are lower. The other side obviously would
be the mirror image of that. There’s the completed unit, with all the horizontal wells in there,
all drying and gluing. There’s your kit. You can count the individual wells, make sure
you’ve got everything there. Probably should have done that in the beginning where we got
all the pieces out of the kit but they’re there. These are the wells that are of different
depths and you can see, we count through them and follow your drawing and just double check
to make sure you glued the box in the right well and you have the right height and you
should be real good to go. Put some clamps on it if you have them. If not, leave the
tape on them. I’d let it sit for a good 6-8 hours before I’d move it. It might be a good
idea to keep it overnight too and not move it, just try it and see. Don’t get too excited.
There’s all the pieces for you and the assembly process for the DIY QRD 13 sound diffuser.