Is it worth the upgrade ?
 

Hi
I have a vauxhall corsa c running Hertz ESK 160 in the front with a hertz 200w amp. and for my sub i have a 450watt Hertz DBA 200.3. i recently found that there is additional space in the back of the car for two more speakers. I was wondering if i notice lot better, louder, all round sound if i buy two more ESK 160 for the back, change my amp up to a 4 channel 4x100 rms and then buy a bigger sub such as the vibe blackair 12" enclosed one ( i want a sub with amp built in)
will this create a big enough benefit worth spending the extra money?
cheers guys

Josh

Whether it is worth it or not is hard to quantify but doubling the highs speakers and the power feeding them will definitely make it louder.

what kind of car?

generally speaking its more beneficial to spend that money have another set of speakers custom installed in the front if you want louder. rear speakers are good if you have people sitting in the back seat or if you watch videos often in the car and need surround sound. music is generally 2 channels of sound, therefore no reason to have rear speakers.