DIY sub with existing amp or buy OEM?

[Bamadude]

Hey guys, I'm looking to replace my sub with something much beefier. I've been thinking about a used SVS PB12-Plus/2 but I found the drivers from that sub (dual 12.2's) and am entertaining the idea of a DIY. Right now the only way to justify the effort is if I could use my existing amplification and save the money of buying a dedicated amp. So, would it make any sense to power the two 12.2's with two unused channels on my Sunfire Cinema Grand (200@8ohms/400@4ohms)? Would that work? Hurt my amp? Not be enough juice? Or in your opinion not even be in the same ballpark as the real SVS box with the 900 Bash? Any thoughts appreciated. Thanks!

[ShinAce]

That's a lot of juice that you have on hand. Definitely enough to get you more than started.

If the amp is happy with 4 ohm loads, do that.

[nadams]

How are you planning on crossing over those two channels to eliminate high frequencies to the sub? I don't know much about Sunfire gear, so maybe it has an option to drive subs?

[Bamadude]

I plan to use the sub out signal from my AVR (see sig) to the Sunfire. Not sure how to split the signal though, or if it can/should be done that way.

[ShinAce]

Yeah, split it normally(y-cable).

Even if you didn't have a sub-out, partsexpress sells RCA crossovers for line level signals. At 5$ a pop, you would be laughing considering the price of a sub amp.

[Bamadude]

So pushing two LSi15's an LSiC and these two drivers wouldn't be over doing it with my amp? I like to listen LOUD :)

[ShinAce]

Make sure it keeps cool(cabinet open and so forth) and if it ever shuts down, ease up on bass boost and volume.