An eq capable of adjusting left and rught channels separately is what you should look for, but that's not for amateurs.
If I didn't have the h701, I'd prob go with the alpine 9835 with an audio control dqs. 3way xover, 6 channel t-corr, and 6 channel 30 band eq. Almost everything u need except phase which can be done via speaker wire.
Interesting how your shop/installer would say you don't need it. Yes u don't need it, but it sure can help a lot if you know what to do with it. I would've expected some sales pitch about EQs.