I am looking at playing around with rear fill, but this means I need another amp.
This leaves me with some options. I currently have a pdx-v9 on my tweeters (M25) and mids (TM65). This puts out about 120 watts to the mids and I set it around 75 watts for the tweeters.
Here are my options.
1) Pick up a 2 ch amp (probably a zapco st-2xsq) for the tweeters and then run rear fill off of the pdx-v9. Probably the cheapest route
2) Pick up a cheap micro amp to run rear fill off of (probably the alpine ktp-445u)
3) Pick up a used 4 channel amp to bridge and use it on my TM65's to get them more clean power and then run tweeters and rear fill off of the pdx-v9. Probably a pdx-f4/f6 so I can stack them or something smaller.
The problem is space. This is in an f150 so I don't have a lot of it. Picture attached showing what I am working with for space. The amp rack is built as big as possible so whatever amp I choose, needs to fit on it.