Sub-Amp Wiring Question - Damping Factor Vs. Power Vs. Bridged/Stereo Mode

8 ohms will give you a lot better dampening. I'd doubt if there is any at all at 2 ohms and the distortion is off the chart too. I wouldn't bridge anything and I would direct couple the drivers to the amp if that is what your trying to do. Get rid of the passive XO and use an active crossover.
 

8 ohms, don’t bridge. So you are saying use one channel of the amp with 8 ohm subwoofer wiring? If so, the problem with that is then I only get 375 watts, which isn’t enough for the subwoofer. I’ve tried it before. Also it’s a sealed design and low efficiency driver so you need some serious watts to get good output.

As long as you balance the channel gains, no problems?

I know the best route is to try it and see, but I have to remove the sub from the box and switch the jumpers internally and I actually have 2 subs/amps in this situation so it would be some work to do it and then there’s the chance of not liking the sound and having to redo it to get back to where I was. Currently, I am using 2 ohm wiring and one channel of the amp.

Hmm… I guess I learned a long time ago that that isn’t a good idea, but for the life of me I can’t remember why. Haha

It's a sub it dosn't need watts it just needs controlled movement. Nothing else to compete with so to speak.. WHY a million watts?

It’s a 10” sub that has an efficiency of 82.7 dB and it’s in a sealed box. Plus I like to be able to turn it up sometimes to hit somewhat realistic volume levels on bass heavy tracks. I have everything working against me from a power standpoint, haha. I need massive wattage to make this work. And it does work. Some of the best bass I’ve ever heard has come out of this sub with proper DSP implementation. After moving to a new house and running into power issues from my utility, I kind of had to start from scratch. I even tried large sealed lead acid batteries with large capacitors and DC amplifiers. Fortunately I was able to get the utility to track down and fix one of the power supply problems so now I’m back to using an AC power amp and am currently trying to optimize it. 

82.7 mercy!!! 90-91% efficient is what I run. 82.7 you would need a welding machine to pump it out. Start there 83% efficient is a tosser for me. Get a better driver, FIRST. 
 

No need to get a more efficient driver when we live in the 21st century and the price of amplifier watts can be had for much less than $1 per watt. High wattage requirements and low driver efficiencies no longer hold us back, fortunately. 

My guess would be very large subwoofers, 15” or 18”. I’ve seen efficiencies that high on large subwoofers.