Megalo, I have been using this processor now for almost 3yrs and yes it will do 4 way no problem...if your interest is in doing 5.1, then it wont...you have to use rear outputs for one of the stages..I have mine as rear midbass front low mid front high horns..you can still do center if you want with the center but you lose the rear section, which imo, you dont want in a sq setup anyways
tuning possibilities are pretty much endless and in some instances, a little better than the P9..it has better x/o options than the P9 and a little better in the TA functions as well....this is becoming a really popular processor in the sq scene in iasca and other orgs as well
Mine is actually a pxa-h700, but it is the same as yours or the 701...I have an imported japan model with the blue controller...the us version of the 700 was green....It really is a pretty limitless processor in its capabilities and I recommend anyone that is really looking for a sq unit all in one, this is it..it don't have a big line driver like some others, but really you dont need it if the rest of the system is adequate....if you run a dvd unit alpine like the w200, 310 etc with screens, or the 9860/61 standalone's, you dont have to actually have the controller.....the head unit will control it...also, any non alpine head unit you connect to the processor, you will have to use volume control through processor unless you max the processor volume and then control it from head
You can d/l the manual from alpine if you want to see the abilities it has in full, but i'm not sure the us site has it....may be europe...but it is the same processor worldwide...or of course, if you need any other info, i'll be glad to comment further if needed as well