Sound Q at high volumes is a bit of a contradiction in terms. If you want excellent sound...asking someone else for their opinion of their sound quality while in practice is a good idea, isnt going to get the answer you really want....what you like.
If you want what other people say is good...there are always better and louder and more expensive.
If you want a louder speaker naturally a 3 ohm speaker will draw more power from the amplifier. Orion speakers are shipping in this configuration.
Sound quality will come at much lower volume levels. Pure sound quality.
If you want your music loud and clear...with only one set of components you need many more things than just an expensive set of speakers.
Asking a loaded question will sometimes come back with many requirements to meet your demands
I would suggest you look into a more affordable set of components and do 2 sets of them for your front stage...
use your 4 channel the simple way instead of getting crazy with bi-amping. You need some skills to tune a bi-amped system to its full potential.
You would just have to run an extra set of speaker wires to wherever the new set will be.
You might have to build some kick panels for the extra set. or make room for them in your door panel...but with your listening position in that truck, you would probably benefit from some kick panels....get the sound much taller and more on axis (pointing at you more directly, louder, more focused)...your much closer to and above those speakers in that truck relatively speaking.
Even getting simpler...you could mount your kick panel speaker set point source(tweet in the middle of the speaker) takes up less space, and the other set as satellites as to keep with the "separate" feel and positionable tweeter(mid bass in the door, tweeter on "A" pillar or high on the door).
Memphis makes their MSQ components....for the money they are a great sounding set of components. Tweeter is dock able (point source) or separate able.
You may also consider doing 5 1/4s for your kicks as well...smaller even still and they reproduce male and female vocal ranges much better...which have the similar tonal qualities of House, Trance, Bass CD Voice Narrator sounds/frequencies that make that music much richer and cooler. (add electronica voice sounds here) lol
This way you could use your whole 4 channel to run your front stage, not "dirty" the sound quality by raising the THD from the amp by increasing your load to 3 or 2 ohms when bridging/ or paralleling your speakers.
When doing this minor change in configuration you have more cone mass, more clean power, less chance of distortion at higher volumes, and something you can not recreate with one set of components.
Along with sound deadening, very sealed mounting baffles and fully separated front and rear waves, among other speaker tweaker topics....that would all be a good start.
How about a 4 channel line driver?
This could go on and on...
If I missed anything or you have more questions, reply back...
I'll be here all week...lol //content.invisioncic.com/y282845/emoticons/fro.gif.c695f1f814b01c4ad99fe7f8cccadd29.gif