CBT36K Assembly Manual
4.3.
C
ABINET
F
INISHING
:
4.3.1.
Cabinet Sanding:
MDF parts are sanded after they come off the CNC machine and assembly area, so most of the work is
already done for you. However to achieve a high end finish you will need to sand and prime the parts. We
recommend that you start with 150 grit sand paper to sand the edges, this will remove remaining tool
marks. Next move to 180 grit and continue sanding the edges and finally use the 220 grit sand paper.
4.3.2.
Prime the Cabinet Surface:
Apply a heavy solids primer compatible with the paint system you have chosen, if you spray the primer
on, you will need to consult the paint vendor for recommendations on tip diameter and air pressures.
Allow the primer to cure for the specified time prior to sanding. Start with 220 grit and sand all surfaces
lightly, but pay particular attention to the edges. Step up to 320 grit paper and again sand all surfaces
lightly and finally move to 400 grit and again sand all surfaces. If you wish, you can continue to 600 grit
sand paper as the last sanding step.
4.3.3.
Cabinet Painting:
Apply a minimum of three coats of paint to the cabinet. A light texture looks good on the CBT36 cabinet
and is easily achieved by lowering the air pressure on the spray gun so the droplets of paint become
larger. After the last coat dries, you can give the cabinet a textured look by lightly misting the cabinet with
paint under low air pressure. You should practice this on some scrap material to make sure you get the
hang of it prior to spraying your cabinets.
4.4.
F
RONT
P
ANEL
F
INISHING
:
The front-panel color of the systems shown at the start of this manual and in the Parts-Express catalog is
General Motors Paint Code: 3986 called medium garnet red. See Ditzler PPG:
http://paintref.com/cgi-bin/paintdetail.cgi?ppg=3986
http://paintref.com/cgi-bin/colorcodedisplay.cgi?ditzler=3986
http://www.ppg.com/coatings/autooem/about/Pages/History.aspx
The following figure shows an example of these front-panel finishing consumables.
(See
http://www.ppg.com/coatings/refinish/en/products/omni/Pages/default.aspx
, also
http://www.growautomotive.com/high-efficiency-solvents.php
Fig. 6. Consumables for finishing the front panel of the CBT36 cabinet.
Finishing the front panels follows the same steps as above for the cabinet but you need to be very careful
working around the tweeter holes. The MDF is machined to 30 thousandths thickness and can be
damaged by aggressive sanding. The bevels where the mid-bass drivers mount require the most
attention. Sand through all the steps as described above and you may want to brush on a coat of primer
on these surfaces and repeat the pre-primer sanding process prior to spraying the entire front panel with
primer.
The painting system applied to the CBT36 front panel starts with a heavy-solids primer, followed by two
coats of the metallic base, followed by two coats of high gloss top coat. Allow the paint to cure the
specified time between each coat. If you take your time and do a good job sanding the primer, you should
not need to sand between the base coats. The top coat can be polished with automotive polishing
compounds and a buffing wheel to give a metallic looking finish.
4.4.1. After Painting is Complete Start the Assembly:
Once painting is complete, the rest of the assembly process will move quickly. Just follow the Master
Check List at the beginning of this manual and it will guide you through each section.
OK, it’s time to start building this amazing new speaker!
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