I built a small amp using one of these in combination with a reverb board. They work great with stringed instruments and condenser microphones. My amp was designed specifically for the Native American flute. In the photo you can see a black coaxial DC connector, four green connectors for two speakers, both if you want mono, and two white connectors represent audio input. One of these is jumpered, if you want mono just remove it for another channel if you want to use it stereo. it is too complicated. I used a 4" speaker from Parts Express, that was 40 watts, since the speaker was idle I had crystal clear sound.
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