It depends on how involved you want to get. Putting speakers in the rear wont really make much difference. You'd get a little more volume but there really isn't room for the high frequency part of the equation (remember, bass is omni directional and higher frequencies are much more focused). Tell us more about the Kenwood head unit. If it makes decent power and has a sub out, I'd recomend replacing the door speakers and running a flat powered sub under the passenger seat. Something like this: https://www.amazon.com/Pioneer-TS-WX...56117805&psc=1
The Kenwood unit is this one: https://www.kenwood-electronics.co.u...sb/KDC-W7044U/
main reasons for wanting rid of it: no bluetooth, horrible to use (buttons/knobs are just awful to try to use while on the move) and the sound is terrible.
I know the sound is likely down to the speakers but cant help feeling that there is something very worng with te built in amp on this unit.. I have read that running 2 Ohm speakers will damage the amp, hance trying to find out the pec of the base level speakers
I have seen some cheap kits on ebay that say they have Pioneer speakers with adaptors to make them fit the R170 doors.... Not totally sure about these, gut feeling is they would be a waste of money? https://www.ebay.co.uk/itm/Mercedes-...0AAOSwPpZaTjFV
I have already bought a new head unit: https://www.pioneer-car.eu/eur/products/deh-x7800dab
and been carefully checking the supplied loom connector etc. luckily it works out this is a straight plug in to the SLK loom
BUT there are warnings in the ,manual about not running 2 Ohm speakers - hence my questions
I know this head unit is quite capable but I am not an audiophile and the thought of messing around with amps etc just seems over the top... If i do go for an amp i would want it to be a simple and invisible as possible.
I also found when i removed the kenwood unit that some previous owner had been a real cowboy behind there!
there was a Denison Gateway 500 fiber optic input, spliced really badly directly into the loom, which was just floating about banging around inside the center console and not actually connected to any output at all! Needless to say, my SLK will be better cared for from now on!