Quoted from Strummy:
Sweet. Let us know how it sounds. My wife already complains about the 10 so I don't see myself upgrading anytime soon!
Got the 12". It's big - duh, but the cabinet it's in is also bigger than I imagined. And yeah, the sound is big too. My adapters haven't arrived to multiplex it between machines, but I quickly hacked it onto my Star Trek for a trial run. Running it at max is overkill and exhausts my ears after a decent full game, but a little over half power has a very good effect. The main thing is, you don't just hear the sound now, you -feel- it. It's like adding a ColorDMD: adds new vigor to your game again. It's also tough to play as good as usual, maybe too distracted and amused by the additional effects. The "heart beat" sound on ST is one example that is way more dramatic now.
I learned a couple of things messing with it. I thought the easiest way to try it out was use a 2-pin IDC and move over the existing 4-pin connector so the backbox is on one side and free to hook the sub on the other. The only thing is when you do that, the backbox ends up on the cab connection and the sub is on the backbox connection. I wondered if it mattered: maybe there's no difference in signal on either channel. But there definitely is: so there is some difference in the on-board processing for each channel, and you don't want to do this, at least on SAM.
I also figured I would use it in place of the current cab speaker, which I actually also had previously upgraded. This upgrade seems like another similar jump up in quality and effect as that upgrade was. If you're going from stock speakers to this, the difference will be really dramatic. Either way, this upgrade is well worth $100, and especially if you're multiplexing across several machines. Anyway, with the existing cab speaker out of the loop, it seemed to leave a bit of a gap in the quality of the lower mids in the sound spectrum. Then I wondered if I want to leave both connected, how to do it: series? parallel? What effect on impedance. I'm sure this is all discussed in an audio thread, but as long as I'm here, powered subs reportedly don't effect overall impedance and it's fine to hook in parallel. That also gave the best overall results, and probably how I'll run all the pins.