i have two 12mtx subs right now with 4 channel 350watt amp for subs and speakers and tweeters

if i got a seperate amp just for my speakers would it make them louder?

 

thats a silly question, but it actually depends if you get amp that has more power than what your 4channel amp is pushing out now. if yes than yes it will be louder and probally clearer. assuming you use the 4 channel for the mids and highs and get another sub amp for the subs