Thanks a ton for all the info guys.So the JL Audio 10W6v2-D4 and Dayton Audio RSS265HO-4 10" are 4 ohm and it would work with this amp? Both are 600 wrms. The JL is twice as much as the dayton. Is the JL that much of a better quality sub or is it the name that costs extra?
The 900.5 says RMS Power 4Ω Bridged 230 x 2 & 440 x 1. Would that do what i want it to?
It looks as though this place is selling them
Precision Power P900.5 Phantom 70 x 4 + 270 x 1 @ 4 Ohms Compact 5-Channel Class D Amplifier 6.5x11.5x2
The JL w6 is dual 4 ohm which means you will be wiring it to 2 ohms final so you'll want an amp to push it at 2 ohms. (Which is why I was suggesting the Boston GT)
The Dayton is Single 4 ohm so you will need an amp that does the power it wants at 4 ohms.
If you really want to run one amp, you'd probably better go with a 4 channel amp. Reason being, with the w6, not too many 4 channel amps are bridgeable down to 2 ohms to push that sub. Most of them are only stable bridged down to 4 ohms. In the case of the Dayton, it is single 4 ohm so finding an amp to run it wont be as hard but finding one with adequate power for it bridged at 4 ohms might be. That is why, IMO, if you want to run one amp, go with a 4 channel bridgeable down to 2 ohms like the Boston GT or a nice 5 Channel amp.
In regards to the price, having had experience with both woofers, I'd say it really depends on what you want. The w6 can be put into a slightly larger than "recommended box" and raise the efficiency and wont need as much power to get it making some noise. The Dayton, on the other hand, likes TINY enclosures and is not the most sensitive sub so it'll need more power than the JL will to achieve the same level out output. In my opinion, thats the main advantage the JL has over the Dayton. But, that is also dependent on your listening preferences. I may like more bass than you do or vice versa. But, remember, it is always better to have too much bass and turn it down that not enough and end up blowing something trying to get more output. Whether or not you feel the price difference is reasonable is up to you. But, in my personal opinion, and again from experience, I'd pay the online prices on the JL w6v2 as they are amazing woofers. But, the Dayton is also great. You cant go wrong either way.
For an amp recommendation, I'd say the Alpine PDX 5 is a great candidate. Small enough to fit anywhere with very nice power and sound pretty nice as well.
Buy.com - ALPINE PDX-5 Car Amplifier - 75 W RMS - 5 Channel - Class D
Since it does constant power on the sub channel at 4 or 2 ohms, you can use either the Dayton or JL sub. But I'd have to think the JL would give you more output on that amount of power.