Monday, January 22, 2007

ProAC 2.5 Clone Project - Part 2

In my previous article, I listed all the tools, material and parts used to build my pair of speakers.

Cutting - I used the dimension from here to cut my MDF sheets to size. When working with MDF, I highly recommend wearing a dust mask and goggle. MDF is very dusty.

Panels - When I bought my 4'x8' MDF sheets at the hardware store, I asked them to cut it in half (4' x 4'). Two reasons, it's easy to drive them home and to cut on my tablesaw. I used the tablesaw to cut the panels to dimension.

Speaker and port holes - Use the router with the Jasper jig to cut all those circles. Cut the recess first, then cut through on the inner diameter. When cutting the recess, make sure you account for the thickness of your veneer. I made that mistake. I did not do that, so my speaker drivers sit a bit deeper than desire. I also use the Jasper jig to cut the holes for the bracing piece. Note: If I'm to build another pair, I would veneer the front panel first before I cut the speaker circles. You should get a better look and fit. Trimming veneer from the recess part is difficult.

Putting the front and side part together - Glue everything except for the rear panel to allow access for installing the crossover and damping materials. I used drywall screw in addition to glue. In hindsight, I don't think the screws were necessary. The wood glue provides a very strong bond.
After the glue dries, use the orbital sander with varying grits to sand excess glue and any imperfections in your cuts. In some area, I had hairline gaps, I used wood fillers to fill these gaps.

Port and Binding posts - I added a 100mm x 100mm bracing for the port and glue it to the inside of the cabinet as mentioned here. Before gluing the port, I decided to paint the inside of my PVC pipe black (a glossy black aerosol spray paint can). At this point, I decided to apply the Maple veneer, glue in the Ports (PVC pipes) and the binding posts to the rear panels. Add the damping material (felt and poly-fill)

Add Damping materials - Add the roof felt to all the internal surfaces except for the front. I used spray adhesive and stapler. Then glue the poly-fill on top of the roof felt. I used spray adhesive. Also, this is when I install my crossover module. I'll cover on building the crossover module in the next article.


Website Design said...

Thats a very interesting post. I have been inspired. Thanks.

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