My head unit has stereo preouts for a subwoofer. I'd like to make use of this rather than using the crossovers on the amp as it lets me alter settings from the driver's seat rather than by fiddling with an amplifier. The amp I'm thinking of getting is an Alpine MRV-F407. The manual for it has instructions how to wire it up for a subwoofer, but using the HPF in the amp.
The manual is here FWIW, wiring diagrams around page 18:
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What I'm wondering is can I connect my stereo sub output to input channels 3 and 4 on the amp, then bridge the output to run a sub? I know bass isn't directional for your ears, but that doesn't mean that both left and right channel are going to be the same on the actual recording... I'm thinking of getting an Elemental Designs sub as they're cheap and small, and they have dual voice coils, which would mean I could wire each channel to a voice coil, but I suspect that would also be A Bad Thing.
I'd be very pleased if someone actually knows...