Also, I'm thinking you don't really mean the true meaning of SQ. True SQ takes thousands of dollars to achieve, and thousands of hours of tuning. I think what you're really looking for is clean and clear sound, that doesn't distort. If that is the case, these subs will work perfect. The Sundowns will be fine too. Most choices will work fine. All of the suggestions in this thread have all been really good actually.I just remember when I was planning my first non flea-market setup, I thought I was looking for SQ. And then I saw some real SQ set-ups, and what really goes into them. Fabricating custom speaker pods, buying fancy processors and other high-end equipment. Unless you're a trust-fund baby, you're not gonna be able to afford a real SQ set-up at 16
But clean, clear, and loud is much more easily achievable.