are less than 14 x 7 x 50 inches!
This is the box design I personally used when
I competed in IASCA years ago. I chose small pickups, an S10 and a Ford
Ranger for my vehicle for a very specific reason. That reason is I hate
distortion and love clean bass. The two pickups, Ranger being the
better of the two, both exhibit the lowest body panel flex of any cars
because of the simple fact they were so much smaller, and no perfectly
flat areas existed. The small cabin greatly exaggerates cabin gain and
pressure issues making this type of install rather challenging, another
reason I went for it.
The biggest MISTAKE people make with pickups
is trying to use 2 - 12" woofers. 90% of the time, the boxes can't be
built large enough to yield low bass, and 100% of the time, the larger
cone area crammed against the back seat doesn't breath right.
Then there is the issue of bracing and box
quality in general. If your box is the average store bought carpeted
wedge without bracing you create a monster in your truck that generates
ear fatigue within minutes. This coupled with the only flat surface to
flex (the back window) can give you permanent ear damage within weeks.
A properly built and braced box like this one
can be listened to at high levels all day long without creating ear
fatigue because there is no panel distortion. Adding an attractive oak
cleat to your rear window is also a sound idea for the same reason.
We found that this box design fits in all
small pickups, including the Ranger that has a brace only 14 inches
from the floor holding your cabinet out an extra inch. (This one fits
under it). The idea is to get the box as far back as possible, ideally
glued directly to the steel. (Yes remove the carpet, or cut it out for
the box) This box fits these trucks at only 13.5 inches high and at
7.75 inches deep it is possible to have the seat all the way back.
This cabinet seems simple, and it is, but not
because there is no design or testing behind it. In the high
pressure-quick cabin response atmosphere of the small pickups, we found
that the best coupling comes from centering the drivers as close
together as possible and as low in the box as possible. This origin
yields the most even distribution of pressure within the cabin and cuts
through the seat far better than the more typical separated alignments
you so often see.
The volume of the box is small, and the
magnet on many heavy duty woofers will almost touch the back of the
cabinet. If you model the average small box sub on the computer for
this box volume you will usually get very poor low end response. In the
real world however, the cabin gain and back seat have almost the same
effective loading characteristics as a band pass alignment and
consequently effect the actual output to a degree that can't be easily
This means that even when left 2nd order
(sealed) a pair of kicker C-10's or MTX terminators, or the DHM-108, or
JL10WS, or basically any small box sub-woofer won't sound like much in
the low bass department in your garage, but once installed into the
truck, you will see wonderful response below 32 Hz most of the time.
If you choose to port the cabinet, it must be
ported out the ends at the bottom of the cabinet so that the ports fire
into the door. This is absolutely essential with this box design.
We feel this is the maximum amount of bass
you can install into a small pickup using two 10" subs without using
the bed or cutting holes. Grate care was taken to keep the cabinet
small and integrated into the cab so that there would be the CORRECT
amount of air left in the cabin to resonate at lower frequencies. If
you increase the woofer size, the bass is actually reduced from less
This is a divided box to accommodate stereo
or mono bass. It can be run full range with no crossover in combination
with 3.5" dash speakers for surprisingly good sound in a budget system,
the full range creating mid-bass and rear ambient fill. We recommend
active crossovers and decent mid bass drivers low in the door combined
with a good pair of VIFA soft dome home speaker tweeters in the dash.
The finish on the box is representative of
all DECWARE boxes. It is an acrylic base coat (white) with a marbleized
(sponge work) coat of black followed by a translucent vinyl top coat.
The top coat determines the actual color, in this case red to match the
interior. The top coat is called MAR HIDE or something like that, and
is a vinyl paint used for touching up car interiors. Available in all
colors at any auto supply store.
Options for this enclose would include using
a pair of 8" or even 6" sub-woofers rather than 10's. The box size
remains exactly the same.
PLANS ARE AVAILABLE FOR $9.95
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Copyright © 1996 ~ 2014
by Steve Deckert