IMO axioms subwoofer design is more setup for home theater type bass than music. I'm no expert, but the magnet on the back is comparably small when set next to a high end car audio style subwoofer. I assume the large magnet (and high power amp) allows deeper, tighter and faster bass. Which (along with something else) I enjoy as often as possible.

So I say, skip the sub and buy some M80s and QS4s. Some day later in life you can get the sub(s).