Cabinet drawings
Assembling cabinets
Here 21 mm Baltic birch was used for side and
rear panels. Internal panels were 18m mm incl. bracings.
Rear panel was made 264 mm wide and rebated.
See drawing above. Bass drivers are 260.4 mm
diameter.
30 mm Baltic birch (21+9 mm) was used for front panels.
50 mm front panel fillets were made from solid maple
wood.
You don't have to make front inner panel like
seen on the full drawing. The above is perfectly OK.
 
 
The front panels
Routing
Baltic birch takes a fresh, razor-sharp router bit.
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Solid maple used
for fillets. Strips made from mahogany.
 
There are tolerances on the flange of the waveguide, 7-8 mm, so don't
route for this until you have it at hand!
 
Routing for bass drivers
Routing
Baltic birch takes a fresh, razor-sharp router bit. Start routing to
e.g. 0.2 mm depth, then sand the edge. Proceed another 0.3 mm and then
you're safe.
 
 
When
using Eminence Deltalite II 2510 bass drivers, use min.
25 mm rear panel thickness as the Deltalites need 19 mm
rebate. Glue small
pieces of 10-12 mm plywood under screw holes for secure
fastening.
Alternatively maintain 22 mm rear panel thickness and
route to 12 mm depth. This will leave some 6-7 mm foam
gasket above rear panel
level. Doesn't look bad at all.
Cabinet damping:
Two types of damping materials are used in
the DTQWT construction:
Left: 8 mm felt. Right:
30 mm polyester damping material.
1. Green (drawing): 8 mm felt material.
2. Yellow (drawing): 30 mm polyester damping material/acoustilux.
Add felt to
sides of front and rear chambres.
Center chambre: No damping material is used here.
Top of cabinet: Add felt material as shown on
drawing.
Front chambre behind JA8008
driver:
One layer of 30 mm polyester, 22 x 25 cm is
placed behind JA8008 driver.
Fold a piece of 20 x 30 cm 30 mm polyester, place at bottom of
front chambre as seen on drawing.
Rear chambre behind bass
drivers:
Add felt to internal panel and on sides as seen
on drawing.
Fold 23 x 100 cm 25 mm polyester damping and add to bottom of rear chambre as seen on
drawing.
Total damping materials for two
cabs:
- 2.0 sqm 8 mm grey Jantzen Audio felt.
-1.5 sqm 30 mm Jantzen Audio acoustilux.
Approx.
measures for felt damping materials, in total 2 m*m.
 
Felt
material added to front chamber, 50 cm from top of front
interior panel. Glue and staples are used to keep things
in place.
For the 30 mm polyester damping only staples are used.
Pics taken before the 10 mm felt material was available.
 
Half-fold
a piece 30 mm polyester damping (23 x 35 cm) cm as seen on photo and
fasten with staples.
Add 30 mm polyester behind JA8008 driver as
seen on photo and fasten with staples.
Add felt to top of cabinet, a piece of 24 x 50 cm is
needed.
 
Left:
Add felt to sides of rear chambre as
seen on photo. Felt reaches all the way down to the
bottom of the chamber.
Fold a 23 x 100 cm piece of 30 mm polyester and place at bottom of rear
chamber, see drawing.
Right: Ups....almost forgot the front chamber bracing...
still time to glue this in place.
 
The final layer of damping the top of side
panels. Approx. dimensions seen on drawing.
Cab feet
Found
these at a local diy home market: Total price < 15 US
$), that is:
Spend money where it counts! This works perfect.
The
final cabinets must be 30-45 mm above floor level!
Crossover mounting
 
Left:
Believe me, this is the last time I mount terminals after
having finished the cabs! I suggest using a terminal
board that allows
access to the top (at the bottom) of the bass horn. Right: Bass crossover section in place at rear internal
panel.
Front
driver crossover in place at front internal panel.
Secure driver leads
 
Secure
leads from drivers like seen on photos. Ripped terminals
are a real pain! Wires used are silver plated copper in
teflon.
Read here how you fasten
the waveguide to the tweeter.
There are tolerances on the flange of the
waveguide, 7-8 mm, so don't route for this until you have it at hand!
TWEAKING THE DTQWT
Please read here:
http://www.troelsgravesen.dk/DTQWT_tweaks.htm
Damping of rear bass drivers
Happy building
By
the way -
Baltic birch residues
makes a nice bonfire for your afternoon coffee - made from freshly
ground Arabica coffee beans.
Poor yourself a glass of a good twelve year single malt to celebrate
the occation. Enjoy!
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