To use the Sonic Impact T-amp in self-powered speaker designs, the first step is to remove the amplifier board itself from the overall plastic housing. First, remove the plastic volume knob by sticking a knife or other flat object under the edge and prying the knob forward. Remove the screws under the knob that hold the volume control assembly onto the top portion of the plastic case. Then, to get both halves of the case apart, remove the four screws concealed under the rubber feet and two small screws inside the battery compartment. At this point there are just two plastic rivets and some glue that hold the board into the enclosure. The glue doesn't seem to adhere enough to cause difficulty removing the board, so you only need to carefully snip or trim off the rivets with a small pair of side cutters or a razor knife. Cut off the wires going to the battery compartment and the speaker terminals, and the amp should be ready to go. I would suggest using as much of the existing wire leads and input jacks as possible, as the small size of the board and components makes it difficult to modify.

For my project, the only modifications I did to the amplifier module were changing the power indicator LED to blue, and removing the PC-mount 3.5 mm jack. The LED swap was accomplished by cutting off the stock LED and soldering on wires going to the new blue LED. I removed the PC-mount 3.5 mm jack with desoldering braid, and then soldered the three conductors of the microphone cable in its place. The other end of the microphone cable was soldered to a panelmount 3.5 mm jack as the main input. The rest of the wires and connections were used as-is, and only needed to be extended in length for easier installation.