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in one of my recent videos i showed the
open baffle subs that i built and also
how impressive i thought the base was so
that got me thinking about something
called infinite baffle and that's
actually a step up if you can do it in
your room and that's where you take the
woofers and you mount them in the wall
rather than
building a box with them so what you're
watching right now is me cutting the
plywood to make the baffles for the
woofers to mount in i'm going to have
two in each one and i'm going to have
two in total one on the right and one on
the left and i already picked out a
place in the wall where i can put them
and how big they need to be
i should say while you're watching this
i'm not doing this in the best possible
way a better way to do this would be to
take that half inch plywood that's on
the front and fasten it to the three
quarter inch plywood panel on the back
before cutting the holes and now i
should say that i'm sizing these holes
so that the woofers mount on the back
and won't go in from the front
i need these circles that i'm drawing
here for two reasons the first is so
that i can cut out the center with the
jigsaw rather than doing that with the
router and the second is to make it
possible so that i can line up the top
panel when i glue that on and then the
flange of the woofers that i'm going to
be using has a lip
and i need to cut a recess for that to
fit in that's what i'm doing right here
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and like i said before here i'm cutting
it out with the jigsaw and then i can
glue on the top panel using that mark
that i have there to line it up properly
then i drove in a few pins to keep it
lined up
and put on some clamps and let that dry
i changed up the bit and my trim router
to one that has a bearing so that it
will follow the precise cut i did before
in the face plate and then trim away the
rest of that three quarter inch plywood
underneath
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and then i changed a bit again to one
that chamfers and i ran that around the
edge with all that done you can see how
it fits the back plate goes in against
the flange and it clears that rubber
surround
i'm going to be mounting this in the
same way that i've been mounting the
plywood panels in the room
and that's with screws so that's what
i'm drilling these countersinks for
after a quick sanding i brought it
outdoors and i sprayed on three coats of
water-based polyurethane and then when
that was dry i could bring them in and
put them in the wall
once again if you've been watching my
videos you'll know that this front wall
has a lot of this plywood with a lot of
holes in it i actually did all this in
another video if you saw that this will
all look very familiar to you and this
is really the only place in the wall
that i can put them one on one side and
one on the other so i need to take this
panel off and remove the insulation from
behind it and that opens the space so
that i can cut out the drywall that's on
the other side of the wall and it looks
like it but i didn't use the jigsaw for
the drywall i actually had to cut away
some of the wood so that these new
baffles would fit in there and speaking
of which here's the first one installed
and you can see the wire coming out
beside the insulation and i took that
and i plugged it into the amplifier and
listened to it and wow i was almost
knocked over with the amount of bass
that was coming from just these two
woofers now that's all there is to that
just mount the baffle in the wall and
cut out the drywall behind so that it's
completely open
to the room that's behind that wall but
i do need to reinstall that holy
diffuser beside it and to do that i need
to cut it down to fit so these are just
plywood and they have cloth on the back
so the first thing i need to do
is peel off some of that i used staples
and i also
glued it on just to make sure it
wouldn't come off
and man i really held on there and then
when i had that done i had to pin on a
guide strip because my holes are not
actually parallel to the edge they're on
a slight angle
so i put that strip on there at that
angle
to go up against the fence and i put on
the other strip there just to hold the
panel up to the correct height while i
made the cut
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and then when i had that done i could
take off those strips and use the strip
that i cut off
to line up the holes
so that i could mark out exactly how
much i need to cut off the panel
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and here you can see how that lines up
and it looks pretty good it's not a
perfect match but it'll do and then the
only thing left to do is to glue it on
there and get it clamped up and let that
dry and then i can put it back in place
and while that was drying i did the
other side in the same way and then i
got around to actually testing it after
listening to it for a little bit and you
can see the mic set up here on the stand
this is a near field response test and
that's what you're looking at right here
that yellow arrow is pointing to the
crossover point for my subwoofer output
on my receiver and it's 80 hertz and
that measurement also gave me the step
response which looks pretty good and
then i moved on to actually integrating
them into the room and i did that with
my measurement mic set up at the
listening position
tested the full output from the
subwoofers and the main speakers and
that's what you see right here before
anything and this is not bad at all a
little bit humped up below 20 but you
know what i'd rather have bass to throw
away in the room
than not enough
so then i took that response and i used
that to
set up a profile in equalizer apo and
here's what that looks like after i
finished optimizing that and then here
the green trace is the original and
the red trace is the equalized
my name is
max my world is fire