I would NOT recommend amplifying those 4" speakers as 4" speakers don't really output a lot of bass because of their limitations and many regard 4" to be the realm of "mids" than "bass". You really need the additional wattage on bass producing drivers -- mids and tweets practically sip power lang.
To be honest, I would recommend a subwoofer to really appreciate a setup using 4" speakers. That way your subwoofer can pick up the bass region. Would I prefer coax? Nope. I'd still nod in making a 6" hole in your doors to accommodate a separate component than a coax. Fact is: you shouldn't be hearing vocals coming from your hips, dapat ear-level yan dapat.
Last edited by jhnkvn; June 5th, 2017 at 05:15 PM.