i want either a pioneer or alpine headunit but i just wanted to know which models had the feature to take all the bass out of the door speakers and just have the bass from my subs. i forgot the name, some type of filter option....i dunno.
That is called a crossover. It looks like the pioneer models have that from the 6700 up and the alpine on the 9847 and up. Also some aplifiers have this feature built in, and then it doesn't matter (for that anyway) what headuint you get. Also, if you are looking at pioneer, consider getting the premier version, as it has a few things better (like higher pre-out voltage) and is only a little bit more.
i'd choose a Pioneer Premier over the Alpine units that are out now. older alpine HU's were great. seem to be going down hill. but usually if the HU has a pre-out, it'll have crossovers for that set of speakers.