something is still missing

z me fly

Thanks for taking time to respond to my problem. The stereo guys hooked up my door and back speakers to a Massive NX2 amp.I believe it is a 2 channel but you can only hook up 2 sets of speakers to the amp.
the new speakers are Hertz(ht25 as the tweeters and ecx87 inback and 6x9 triaxil in the door). The amp does have a Hi-pass filter setting on it.I know that the speakers aren't hooked up as component speakers.Was it a component in the 1st place? The Nissan dealer couln't locate the amp and neither could these stereo guys (that was recommended by one of Nissan audio guys.I just want the whole range of frequencies. It's not like I listen to loud music all the time. Most of the time medium volume.It doesn't mean the sounds can't be crisp and sharp. I would appreciate any suggestions. I have a 2010 roadster w/ the Bose that also has the Navigation system.
Thanks,
Z Me Fly