I'm looking to put a subwoofer in my gf's car. She doesn't have enough space for a subwoofer (she uses her trunk a lot and there isn't enough room for a box) So I'm considering a midbass speaker that preforms like a subwoofer. I'm looking to spend under 300 on it. The amp I have for it is a kicker kx150.2 I want to run it in infinite baffel. Right now I'm thinking about the Phoenix Gold Ti 9 Elite Midbass. Any other recommendations?