Christmas gift for me dual sub $6-700

Ok after perusing and lurking about a bit I was looking at a builds using two Infinity Reference subs per box. This is Jinjuku's dual opposed design that I was considering.

Seems to be a popular build right now and seems to maximize my Christmas gift to myself. I paid off my Yamaha amp so onto this now. The LSi9's sing but need something on the bottom.

Any suggestion (are there 12" Polk or other drivers I should look at). Also I could do two Dayton HF (but two and not four). Not sure what I am gaining or losing (volume obviously) but the Daytons individually are better but are they 2.5 times better? 10" drivers don't seem to save me much budget wise.

Music mainly.

This is subs and amp. I have ply wood etc already.

Thx for the welcome. His build (and the others that I have read that have built it) seem to offer good SQ for the money and a 20" cube is small compared to some of the other subs I have seen.

Plus my budget is a limiting factor. They way it's been explained is low cabinet resonance due to the dual opposed nature. Lower distortion since there are more drivers. I saw one person compare the Infinity (single in a sealed box) to a $200 TC Sounds and said it sounded identical. Pretty convincing (albeit anecdotal).

I did have one person over at Polk Forums suggest just two 15's sealed in same size enclosure but Jin effectively polked holes through that one sufficiently enough for me not to consider it. Just want to see all my options. I do like to rock out from time to time and classical music.

Sorry I meant poked. Fingers faster than the brain and they typed polk twice.

The concerns raised were more surface with the 12's vs one 15. Better power handling, better peak power.... well here is the reply


1. Cabinet vibration cancellation. By have two drivers arranged opposite and in phase they effectively cancel out any transfer function that a single driver would typically transfer to the cabinet. Think about it this way: in Science class the teacher would take a spoked bicycle wheel and spin it at a high rate and then attempt to control it's motion. You would see that person struggle against its momentum. That is transfer function. Now think about have two wheels spinning but in opposite directions (opposed) and then you could control those like they weren't spinning. No energy is transferred because they each cancel out.

2. You get more surface area with two 12" than the 15" Dayton. Roughly 20% more. The Dayton 15" is 829 CM2 the two Infinities combined are 1060 CM2. That's a pretty good improvement.

3. You get better power handling and thermal dissipation with two 12"

4. They model model for around 3 cubic feet enclosure so the 15" doesn't save you any space

5. The Dayton is 8 ohm. Who ever recommended that and the Crown amp either doesn't know what they are talking about or didn't bother to look at the spec. The Dayton would need the XTi 2002 at the least and that amp is $669. The 1002 would work but it's leaving a lot of performance on the table.

Now you could do the XTi 1002 (the DSP is nice) and the Infinity 1260W and wire each dual opposed box for 2Ohm which the Crown will do and handle. It will deliver 700 watts / channel which is line with the RMS on the Infinities. You should probably get more amp than even that (see item 6).

6. The Infinity is probably more conservative on their ratings and it can CERTAINLY handle, one on one vs the Dayton, a great deal more peak power (which leads me to point 7)

7. I would be willing to bet a tear down would reveal the Infinity is a better built driver.

Just trying to keep it around $600 if possible. Beggars can't be choosers and from what I read people are happy with all the drivers so far mentioned in this thread and I don't want a huge box. The dual opposed looks like a way to get the most driver in a smallish box.

On the Dayton the website says 350/700 watts for power handling. I haven't seen the other (1200 watts) that was referred to.
Edited by Habanero Monk - 12/1/12 at 1:30pm

Thx. I am going to do the dual opposed and the epx2000. For under $500 I do not see how I can go wrong. I wonder what you would have to purchase commercially to best this?