Sigh, K here I go. I didnt want to get involved but ah wtf. For the creator of this thread. Dont get an amp, leave your system as is. The amp WILL NOT give you better bass. The speakers on these cars are just way to small to produce any kind of significant bass with or with out amp. The amp will only over power the speakers and make them distort and run out much faster. You say this is just temporary, then save your money untill you can go all alpine. If you are in need of bass and cant live without then Go to Wal-Mart and get those 50 dollar 10 inch sub and amp set up. That will give you the little bit more that you are looking for and will come out way cheaper. You mentioned you dont want subwoofers or something but maybe you should consider it since you want more bass. Now, as far as Sony. It really does not matter. When we are dealing with 4 inch and 5 inch speakers there really isisnt much we can do if we are gonna stay with out any custom alterations. They will almost all provide bad bass. UNLESS you are using component speaker systems. Components are rated at higher rms and are high end speakers so amp's really do make a big difrence there. You do not have components yet and even if you did. They wont give a bass that much better then the coax you have now . For good Bass on these cars, a good single Subwoofer is the way to go. Save and then Go all out with Mids, Highs, and Lows.