The amp i am using atm is a Line6 LD300
http://www.google.com/products/catalog?hl=en&q=line+6+lowdown+ld300&gs_upl=&bav=on.2,or.r_gc.r_pw.,cf.osb&biw=1024&bih=677&um=1&ie=UTF-8&tbm=shop&cid=9363381266965333033&sa=X&ei=oWjxTt3ZMMb-ggfa2JijAg&sqi=2&ved=0CGwQ8wIwAg
(link to specs and what not)
I love the amp, all the features it offers and the low tones i get from it but when i go to slap or play my lower strings it sounds like poo.
I was told that if i connected a smaller speaker that it would help give me more of the snappy high pitched sound
Now my question is how would i go about setting something like that up?

why dont you just simply buy a treble booster or e EQ pedal?
couldnt that give you the sound you want?