SPKR MiK: How to make a microphone from a speaker.

Step 1Materials and Tools

Materials

6.5" dual coil woofer speaker (4ohm). I pulled this one from an Altec Lansing multimedia system that had a blown amplifier.
10" drum. Cheap is okay, but you'll want something with lugs that screw into the shell, not springs or T-rods that screw into couplers. I found this one for $2 at a second hand store.
Two miniature bungee or elastic cords. I got a 4 pack for $2.50
Crimp on terminal rings. I paid $2.50 for a dozen
Adjustable hose clamp (the same diameter as the magnet of your speaker). This was about $1.50 at the hardware store.
Female mounting flange for 3/8" microphone stand and small bolts to mount it. I got this at Parts Express
2 sq. ft. of speaker grill cloth. Also at Parts Express
Thread
Male XLR 3pin panel mount connector and mounting screws
Two 1/4" TS (mono) female phone jacks (at least one needs a tab for a normalling connection)
A six-pole four-throw rotary switch (I scrounged my switch from a 4-way printer "data" switch box), or you can use Mouser part no. 105-SR2921F-34S
100 ohm potentiometer, also called a variable resistor
two knobs (for pot and rotary switch)
Two DPDT toggle switches (on-on)
A SPST toggle switch
Resistors: 100k ohm, two 10k ohm, 10 ohm
100nF capacitor
1:1 ratio audio isolation transformer (pulled from a second hand 270-054 I got for $1)
metal container to hold and shield transformer, and mounting hardware
heat shrink tubing or electrical tape
connecting wire. 22ga or 24ga is fine.
short microphone stand (another second hand store find)