Subwoofer choice with Hifonics BXi1210d amp

[arbs]

Can you tell me what SQ means to you?

Well you got me kind of stumped now. Lol jk. Well a sub with good SQ to me would be a sub that can hit every beat without a miss and have a wide range in sound. I have a mustang so everything inside my car is loud(engine, exhaust, road noise, etc.). I don't have any sound deadening material in my car so maybe I don't really know the true meaning of SQ. But like I said, I'm new to the audio game. Lol.