Re Andy Cutting this from mel.net in 2005
For what it's worth. I've tried as many box amplification systems as I could find and for me the best, for me (by far) is:
For the melody. An Audio Technica ATM35 condensor mic in a little swan neck that clips to the front grill or casing (if your prepared to cut a bit out of the grill!!). This plugs into a AT8532 Power Module. This is either phantom powered or using a P9 battery.
For the bass end: I use the element off of a PZM (Pressure Zone Microphone) screwed to the outside of the bass end grill with the mic looking through the grill at the middle and at one end of the instrument. The wiring passes through the grill and on the inside is soldered to a jack socket fixed into the bottom of the box (not the grill but the casing, so even whilst plugged in you can put the box down). The rest of the cable with the power/switch module has a jack plug soldered to it and this then plugs into the socket on the box. I then cut off the origional jack plug and soldered on an XLR.