I have a JBL PSW D115 sub and like others the amp has blown and is out of warranty, I called JBL and they offered to sell me one of their new 10 or 12 inch NORTHRIDGE Series Subs at a discount which was just below what I could buy one from a discount place but I figured I would take them up on it, then they told me I had to cut the woofer and send in the paper part for them to offer me the discounted price. This got me thinking, I have a 15 inch sub with a nice enclosure would I be better off getting a good quality amp even if it is the same as the replacement price for the JBL offer but this way I would have a 15" sub, which I love, the sound was a little muffled down low but what bass, walls rattled. So my question(s) for the gurus here are: Is this worth doing? or just buy the discounted sub? Which amp is recommended? Stock amp was 250W. Where can I purchase amps? Thanks in advance.