Step 10: What you need
- stereo amp
Check the system diagrams below.
When the crossover comes after the amp, then it has to be big to handle the full amplified signal, and it has to waste power to equalize the tweeter and woofer volume. But, we always need to split apart the highs and lows from the mp3 player and direct them to the tweeter and woofer. So the secret to a good integrated amp setup is that we put a small crossover BEFORE the amp. this gives us an un-amplified tweeter signal, and an un-amplified woofer signal. we route one of those to the left channel input of the amp, and the other to the right channel input of the amp. Then on the amp output side we wire the left channel direct to the tweeter, and the right channel direct to the woofer.
When we put the crossover before the amp, we can also use it to adjust the volumes of the tweeter and woofer, and also to combine stereo to mono if we want to. operating on the un-amplified signal these can all be done without power waste.
So, to make the integrated 12V amp + speaker you need:
- 1 stereo amp per speaker
- 1 crossover per speaker
The stereo amp can be whichever T-amp you like. My build photos mostly show the TK2050 amps.
The crossover - I made my own circuit for this - see my monoXover project. It is a fairly simple circuit so you can build it yourself from parts. If you would be interested in buying a monoXover DIY kit, let me know. Another option is to use a mixing board. Some small mixing boards in the $50 to $100 range can provide this crossover functionality, i haven't tried this myself but it looks possible.