subwoofer advice

Do a google search for "passive subwoofer"- there are still plenty out there.

I may be missing it here, but if its a passive sub, you will need 3 channels of amplification, one for each speaker.

Can the TFM-75 do that?

Just Build one

I may be missing it here, but if its a passive sub, you will need 3 channels of amplification, one for each speaker.

Can the TFM-75 do that?

NO problem, I will give up two 55's and a treo 15 Dvc in a custom box for a 75.

The x-over would have to be re-worked for a passive unless you use a filter.....not the best solution.
Or you would have to go active.....that would be cool but you would need more amps.

Most "passive" subs have a built in crossover that will pass the signal (-the lows) on to the mains.

I run mine that way.

True Frankie. When I purchased a bunch of PSB Alphas for my home we were building 13 years ago, I also bought several matching PSB passive subs. Replaced one of the Sub speaker connections the other day. It has the crossover attached to the underneath of the speaker connection housing.

Was able to find an exact replacement from Parts Express. Then resolderied crossover attachment to back and then attached with silicone.