I have a 95 Jeep Wrangler YJ. The back seat has been removed. The space would be similar to a crx but the hard top is squared off not sloped. I trying to design a new box based off of RF specs for the sub. Should I go with sub back port back or sub up port back? I'm probably 75/25 SPL/SQ, I like to feel lows. What do you guys think? Thanks