Parts Express - Your Speaker Building Headquarters - page 17

17
Speaker Building
Enclosure Design and Assembly
4
The monitor enclosures are fairly compact, measuring 9-5/8" x 5-3/4" x 9.25" (H x W x D) for an internal volume
of 0.14 cubic feet. The subwoofer enclosure is a compact 10-7/8" cube with an internal volume of 0.38 cubic feet.
The enclosure for the DSP measures 3-3/8" x 7" x 7". The completed monitors weigh in at 12.6 lbs. each and the
subwoofer is 21 lbs.
The monitor cabinets are vented, using a single rectangular port, tuned to 70 Hz. This provides an F3 of 65 Hz.
The subwoofer cabinet is sealed, providing an F3 of 50 Hz. In room and with DSP, this extends flat to below 20 Hz.
The monitor and DSP cabinets were constructed using 1/2" Baltic birch plywood, while the subwoofer cabinet
uses 3/4" MDF for the sides, and two layers of 1/2" Baltic birch plywood on the front and rear baffles for an
effective thickness of 1".
I wanted to hide the driver mounting hardware – this usually means securing the drivers to the backside of the
front baffle, requiring a baffle thick enough to accept the screws, resulting in a large bevel on the front around
the driver. To avoid this and keep the front as clean as possible, the drivers are flush mounted on an inner baffle,
then fastened to 4 mounting tabs sitting behind a thin 1/8" front panel. These mounting tabs nestle into recessed
pockets on the driver baffle so the drivers lay flush with the backside of the front panel. The large amplifier opening
at the back of the enclosure allows the driver baffle to be inserted from the back and fastened to the mounting
tabs. The driver openings and port slot edges were then rounded.
To keep the driver spacing as close as possible, I used the optional truncated faceplate for the RS28F-4 tweeter.
This also improves the appearance since the only part of the drivers that is visible is the cone and dome. They
would look much further apart otherwise!
For a modern look, I chose a white paint finish on all cabinets. All edges were rounded and the grain filled and
sanded smooth. I then applied a couple coats of primer, a couple coats of white latex and finally 3 coats of semi-
gloss lacquer, with some sanding in between coats. These finishes were sprayed using a HVLP spray gun.
I was pleasantly surprised by the big sound this
little package delivers, sentiments echoed by the
judges and fellow participants at MWAF 2014.
While the monitors are limited in overall output,
they are more than adequate for a living room
system placed on a shelf for streaming music.
I imagine they would also work quite well with
a computer based audio system.
The Dayton Audio Reference Series drivers
provide a great price/performance ratio, delivering
well balanced response and detail. The RS28F-4
is literally smooth as silk, the RS100-8 is small but
mighty and the RSS210HF-4 is inspiring with its
resolution, output and extension.
Conclusion
5
About the Designer: Michael Turcotte
DISCLAIMER – Parts Express posts the "Project Showcase" as a community service. Projects displayed have not been tested or evaluated by our staff.We
make no warranties whatsoever in regard to the projects’ fitness for a particular purpose. Claims of performance or fitness are those of the contributor and not
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Copyright 2015 Parts Express
My interest in audio began in my early years but really took hold in high school with car audio and stage sound. I
transitioned to home audio in my early 20s but it wasn’t until a few years ago that the DIY bug hit. My first two projects
repurposed some subs and a component set from a previous SQ car system. The results had me wondering why I was
spending so much money on high-end home audio gear! My love of woodworking and audio found their match.
I try to extend my knowledge and skills with every new project, whether that means using new components/materials,
applying new design principles or improving the quality, finish and craftsmanship of my cabinets.
Parts Express parts used in the
F006 Active 2.1 Speaker System with DSP!
Parts List
Part #
Description
Qty
2
2
1
1
1
2
2
1...,7,8,9,10,11,12,13,14,15,16 18,19,20,21,22,23,24,25,26,27,...32
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