I've been doing a fair amount of research on options that I can do to add more low-end to my M3 with premium audio. It seems that going with your own amp/sub combo is the way to go, but I want to explore all options before conceding that path.
I am a bandpass guy, so this is a must. It means I can get away with less power to generate the lows that I want. (You need more power for sealed/ported, so I wouldn't try this with that setup.) My *hope* is that I can bridge the stock sub amp. I have an Alpine 10" SVC woofer in a bandpass box, and I'm tempted to hook it up to see what happens, but maybe someone else has already forged the trail?
I've seen posts where people have tried powering a DVC sub with the stock amp and barely got anything useful out of it. That makes sense because the stock amp is probably roughly 50 RMS per channel, and a typical DVC sub may need a minimum of 250 RMS to begin to hit hard.
However, if it is possible to bridge the oem sub amp, maybe I can get the RMS signal up to around 100 RMS and that would be enough to power a 10" SVC woofer that is rated between 75+ RMS. I have no idea if it will still hit like I want, but I want to know (or try) before doing the custom install. (I've done custom stereo installs in all of my cars, so no worries there - just want to avoid it if I can in this car.)
TLDR: Has anyone bridged the stock sub amp to drive a SVC woofer?