By - Tee1999
Always need a subwoofer, always
You can get a small powered sub that won't take up much space but will greatly influence your sound. As far as bass goes, swapping speakers will do nothing. And no, a new head unit is not necessary.
Will new speakers + 4 channel amp be enough?
No you don't need a subwoofer. Not everyone needs big booming shit in their trunk. The people here are just being funny.
I'm suggesting something like an 8-10"with an internal amp of maybe 100w. Hardly big booming shit, but will make for a much more enjoyable experience. Nothing will destroy those new speakers faster than trying to get a little bass out of ones that can't deliver it.
oh yea let me just leave out a whole section of the frequency range in my sound system
Start with the speakers and amp. That's a good start. You don't have to do everything at once.
Replace speakers and add sub first - I've gone through all this in the past, 5 different cars, especially 2 90's BMWs where replacing head units was impractical, but eventually did it ... if sound is still unacceptable (frequency response, power, sound stage, imaging, etc) then replace head unit AND probably get an amp ... MANY factory head units are crap, even in expensive cars with optional audio system upgrades ... aftermarket stuff is generally much better quality and value ... on one of my 90's BMWs started with an add-on powered sub, then replaced each speaker, then did head unit, each change produced improvement, but the new head unit made MUCH better use of the new speakers than the factory one ... sub's not for "booming shit", its for realistic bass (me - rock, jazz, blues), the people who crank the shit out of several of them with multiple amps are misusing them (in my opinion) ... if you have a video surround sound system at home with a sub, its for the same purpose ... think of bad speakers as "filters/dampers", (in a negative way) removing certain frequencies and components of signals that you need for good sound ... I listen carefully to the bass (instrument) to tune my sub, having low pass cutoff at 80 then 100, 120, 150 Hz, and also trials of lowest equalizer band (Kenwood center frequency and Q) at 150, 180, or 220 for upper bass).