Help po! I'd like to bring up a notch higher my audio set from the stock. Any recommendations on compact subwoofers for my Crosswind XUV. What else might be needed? Gusto ko po kasi maganda sound, pero wala nung malalaking boxes at mga high powered na ampli at sobrang mga wires. Any recommendation also to replace my front door speakers? Thanks. Please add the cost (estimate or actual). Where to get these would also help a lot, I am from Bicol. THANKS A LOT.