untitled

9. From the inside of the dish, put the^3 ⁄ 8 " inner diameter O-ring over the
   microphone cartridge and glue the O-ring to the washer, as shown in
   Figure 6-15.

Figure 6-15:
Microphone
cartridge
in place.

Figure 6-14:

Thread

wires from

the micro-

phone

cartridge

through the

PVC fittings

and pipe.

Chapter 6: Focusing Sound with a Parabolic Microphone 131