About 12 months ago I got an Alpine V12 MRV-345 Amplifier, Alpine splits and a JL 12" W3 Dual Coil Sub installed in the 03 T (preium sound) by a reputable installer. On the way home the Amp was cutting out, installer said oh,you need a cap, its drawing too much. Another $200, another 2 kms down the road, cuts out. Long story of back and forth's, might be this, might be that, I ended up chatting to the boys over at mobileelectronics, it was found that the 4 ohm sub, was wired in 2ohm configuration which the amp they sold me doesn't support. Wired to 8 ohm, problem solved, no more drop outs. Now the sub never sounded good, on fast beat songs, it would buzz. Buzz like it had a hole in it. Slow short bursts sounded ok. I wasn't going back to the installer after 1.5 months of them trying to get a simple install right I just put up with it. Finally got around to looking at it now and the first issue became obvious. Giant box for 2 subs, but with only 1 sub, removedsub, found no separator. Sub needs 35 litres (from the book), but had 63 litres. I added an interior wall to make the volume correct, put it all back together but still buzzzzzes. I can only assume the wrong size box for so long has damaged the Sub. The amp runs the front splits which work great so I assume it's fine. Long story (sorry) short, where's a decent place I can take it to that someone can tell me straight up whats the issue and go from there? I'm located around browns plains on the south side. Thanks for reading my ramblings. Josh