I built a second amplifier (Jon currently has the first one) and connected it to the Prototype VI controller. I then finished the speakers my brother built and connected it all together. It Works!

I built one of the speakers with a crossover and one without. Eventually, I will get Jon's tri-amping software where the crossover is done digitally. When that happens (Soon because Jon already has it done.) then I will drive the speakers directly without using the hardware crossover.

Entire System sitting on my work bench. The controller is in the foreground. The amplifier is between the controller and speaker. I am still using my bench power supplies which are on a shelf above the bench.
Inside of the speaker box. The signals comes into the bos on the top terminals and then goes into the crossover. The tweeter, mid-range and woofer signals come out of the crossover and are routed to the speakers.

Here are the parts:

1. Crossover.

I am using the XO3W-375/3K crossover from Dayton. Here is the specification. It is a three-way, second order crossover with corners at 375Hz and 3000Hz.

2. Tweeter.

I am using the DC28FT-8 tweeter from Dayton. Here is the specification. It is an 8 ohm speaker recommended for 1800Hz and above. It has an SPL of 89dB.

3. Mid-range.

I am using the 4inch M4N from HiVi. Here is the specification. It is an 8 ohm speaker recommended for 100Hz to 5000Hz. The mid-range of the crossover fits well inside this range. It has an SPL of 82dB so it is a little dead compared to the tweeter. This can be corrected when we implement the digital crossover (more gain or less gain for the tweeter).

4. Woofer.

I am using the DC200-8 from Dayton. Here is the specification. Again, this is an 8 ohm speaker and is recommended from 30Hz to 500Hz. It has an SPL of 88dB which is close to the tweeter and will require very little correction.

5. Terminals.

I am using the BPA-38G binding posts from Dayton.