Sounds like he had the gain too high...or was just overdriving the sub. I show that L7 to only take 600watts peak, and he's probably driving the gain a bit, turning up the HU, and either clipping or overdriving. Gotta match your power to your drivers.
Send him this, or just read it and show him how and he'll think you're an audio god...but he'll bug you about it forever if you do. ;)
(Message edited by tonality on June 12, 2007)