How to mount drivers countersunk?
Using a router, the outline of the driver has to be shaped first.
The following tools may be employed as a guide: - for circular drivers an arbour to draw a circle
(just make sure that the router can handle small diameters) - for other shapes a stencil has to be built;
especially for the oval midrange and bass drivers by Newtronics, building a shaping stencil is helpful.
In any case, first the groove has to be cut, only afterwards the hole for the driver is cut-out. The picture on the right shows the individual steps from top to bottom.
Since the rims of the drivers vary in height (the tweeter is much higher than the others), the baffle could be assembled using different gauge panels or a top panel with the maximum required thickness. To ensure that the four midrange / bass drivers are flush with the front you should put sealing tape under them.
You don't have to keep to the overall baffle thickness (38 mm according to
drawing). Almost the same sound quality is achieved by using a 25 mm gauge
board for the bass driver section and 19 + 5 mm or 19 + 6 mm for the assembled
Temperance Description Finished Cabinets Home