main panels: Sub-panel and front side panels
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Do not cut front
side panels to size before last.
The front side panels will be veneered with tiger striped
anigree like seen above. Anigree wood comes from West
Baffle fillets and front vertical fillets will be from
solid elm, which goes well with anigree.
Bass driver is only
additional baffle and rear support panels
drivers are placed on additional 12 mm Baltic birch
baffle as shown on drawing.
The width of the additional baffle is 360 mm. The width
is smaller than the gap between front side panels to
fillets framing the drivers as on the original SFB
grille, front fillets, rear support panels and rear
Panel seen from top. The green line is 10 mm felt
material surrounding JA8008 driver and TW034 waveguide.
280 mm brace is placed at bottom. 200 and 120 mm braces
are placed between drivers.
Upper 120 mm bracing has a cut-out, r = 80-85 mm.
Remember to offset 50 mm! I didn't and had to rework the
Basic panel: 850 x 850 x 25 mm Baltic birch (or
MDF). MDF or similar may do well too.
- Front side panels: 215 x 825 mm Baltic birch.
- Additional 12 mm panel for 8008/TW034: approx
360 mm x 500 mm, don't cut before side panels and
front fillets have been added.
Rear support panels: 2 pcs 500 x 850 mm will make
four support panels.
- Bracing between 8008 and TW034: 650 x 120 mm,
chamfer 6 deg.
- Bracing between Eminence and 8008: 650 x 200
mm, chamfer 6 deg.
- Bracing at bottom: 650 x 280 mm, chamfer 6 deg.
- Panel for terminals: 80 x 650 mm placed
vertical from bottom bracing - or to your liking.
two additional front panels (215 mm x 825 mm) are
cut to final dimensions last.
Cut all panels listed above except for the 2 (4
in total) additional front panels. These I cut
240 x 850 mm for pre-veneering before cutting to
final size. Final size may depend in total width
of front grille and vertical fillets.
- Start making the front grille frame.
- Make the 2 (4 in total) front vertical fillets.
- Add additional 12 mm panels for 8008/TW034
drivers so that this fits into the front grille
- Route holes for all drivers, remember none of
the drivers are flush mounted.
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Test set-up from
newly cut panels. Front side panels cut too wide for
Rear bracing: Width
= 650 mm, depth 280, 200 and 120 mm respectively. All
chamfered 6 deg towards main panel.
The rear will be covered by cloth - quite a challenge to
make a curved frame for holding the cloth.
Gluing the rear support to front panel. More clamps were
used than seen here.
Use biscuits at bottom panel to keep rear support in
place during tightening of clamps.
I rarely use screws for cabs, but here a added four
screws to keep front panel in place (not seen on photo).
Tiger striped anigree veneered side panels, ready for
cutting to size.
Panels finally shaping up.
Note gasket for lifting 8008 driver. Made from 2.8 mm
plywood. Right: Felt padding around mid and tweeter, this was temporary.
Extended listening made me try out a second
option: No felt on front panel and in the end this is what I prefer.
Slightly more midrange presence.
Consequently I added a 10 mm sheet
of plywood in replacement of the felt and painted it black.
of 8008/TW034 drivers:
Depending on front
panel damping material, being either 10 mm polyester foam, 8 mm felt material
or a 9-10 mm sheet of plywood, mount
drivers to be flush with foam/felt/plywood material as
seen above. If you use plywood, glue this first and route for
The ~10 mm green felt material seen above fits
nicely with the 8 mm height of waveguide flange.
To align the 8008 driver with the waveguide a
thin gasket was made from 2.8 mm plywood.
To make the cut-out in the waveguide flush mount
the waveguide on a piece of spare MDF. Secure the
waveguide with screws and route for the 8008
driver as usual (view TQWT and DTQWT
constructions. View more detailed pics TQWTcabs). Route to depth of 5.5
Only thing missing is front grille and top fillet.
- and maybe some nicer wiring for mid and tweeter....
First front grille in place.
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