So I'm looking to get a little 2x amp I can use to power a single 10" Image Dynamics sub. I haven't picked the amp yet, but prolly an MTX I can bridge to 150W 4ohm mono or so.

But my question is, ID has dual 4ohm and 2ohm versions of their 10" sub. Which better suits my application and why?

 

figuring out what ohms you need has to do with what amp you're going to use and how many subs you plan on running. you say you're going to use 1 10" along with a 2channel MTX that you're going to bridge. assuming that the MTX is 4ohm mono stable you would need a dual 2ohm. if you were to get a mono amp then you would most likely need a dual 4ohm.

just remember tho, if you decide to add another sub later on down the line, that setup wont work anymore.

 

I'm not planning on anything big, just a small box.

So I think I'm going with the MTX 4202 which puts at 50x2 @4ohms (amp is 4ohm mono and 2ohm stereo stable). And if I go with the single IDQ10D2 (2ohmDVC), and wire each voice coil independent to each channel, I should be pushing 100w to each voice coil, so 200W to the sub @2ohm stereo. Right?

Okay, given my math is correct in this whole DVC hooplah, this seems like the ideal setup for me.

 

Maybe this will help.

http://www.adireaudio.com/tech_papers/dvc_subs.htm

I think this is the case with a stereo (possibly un-equal) signal....

"BUT - let's drive one coil, and short the other. Guess what? Things change from the original (both coils driven) situation, but they also stay the same. The driven voice coil is pushing and pulling, as normal. But what about the shorted voice coil? Well, it's trying to keep things at rest - it's trying to resist ANY motion! The net result is the overall peakiness of the resonance is the same as it was when both coils were driven, even though we are only using half the motor (driving one coil). The other coil helps "tame" the driven coil, so that the system basically behaves the same as before."

It sounds like a 4 ohm mono or 2 ohms stereo will both work, but sound different. Any experts here?

 

Thanks for the link.

Looks like a lot of folks I've talked to have shot down this stereo configuration. They say to keep it mono- which makes sense.

But I still can't get a definitive answer about the 2ohm or 4ohm DVC. Some say get the 2ohm and wire it in series and then bridge. Other says get the 4ohm and wire it parallel and then bridge.

 

2 ohm DVC in series is a 4 ohm load.
2 ohm DVC in parallel is a 1 ohm load.

4 ohm DVC in series is a 8 ohm load.
4 ohm DVC in parallel is a 2 ohm load.

(parallel is product over sum. 4 ohms dvc is (4 X 4)/(4 + 4) = 2 ohm)

Your amp can only drive a 4 ohms load in mono. Your only choice is a 2 ohm DVC or SVC 4 ohm.

Check out the owners manuals on Alpine's type-r subs. They have nice diagrams.

http://www.alpine1.com/

 

Bleh, scrap this. I decided to go cheap/simple/small and go with the Infinity Basslink.

Bleh, hours of research down the drain.