Good DIY sub to match Paradigm Studio 20 V.5
As the title suggests, I am looking into a good paring for a possible DIY sub to match my Studio 20's. These are separate from my HT and are dedicated to audio listening in my home office, just for a bit of background. I also do not need anything too massive, as it is a fairly small room, so I was thinking perhaps a 10" or 12" driver should suffice.
I was originally thinking of just going with a Paradigm Sub 12 and being done with it, but I have built my own HT room as well as a few subwoofer projects in the past and would like to take on the project for something to do this summer. I would like to keep the project price at or below that of a SUB 12 (~$1,500 - $2,000). I also would need this to be a powered sub, either an in-enclosure amp or separate, as I am driving the Studio 20's with a 2-channel amp. I think I am leaning toward a all-in-one solution, meaning the amp resides within the enclosure for simplicity, but right now I am open to any and all ideas.
For now I could use some pointers to maybe similar projects or even a good driver choice to start with. I would consider the over-riding criteria, besides price, to be a good sonic match-up to the Studio 20's. I do not need tons of power or super deep bass, just looking to add a little more low end.