Originally Posted by cfnick
I have a 07 coupe not a limited and was told by my audio tech that i cannot change the head unit when I put the new subwoofer in and keep the stock speakers because they will not work I was going to have a 10 inch sub put in with a new headunit with the i pod plug. The tech said he could put the sub or the head unit in but not both without changing the speakers and going into the 2000$ range..all beacuse of Mercedes special amps that only work with factory speakers.If anyone was successful in putting in a sub and a head unit please let me know how you pulled it off for a reasonable price 0-1000$ I do not have Nav in my car
So you have the base model?
The base model has no additional infinity amp, nor has the 6.5" subs in the rear.
It only has a 2 channel amp in the hu which is directly connected to speakers in the doors.
The hu is silver and has black *****, whereas the limited infinity hu has silver *****.
If you want to upgrade your system in a first step at a low price i would recommend to replace the hu, add a 4 channel amp (2 channels for the front system, 2 channels bridged for the sub) and a subwoofer with enclosure that you can put in the trunk. Also would recommend to dampen the doors with alubutyl and foam. If you want a better staging, than put new tweeters in the a pillow – but this will need to upgrade the front 2 way system, or run the system full active.
If you want to run your system full active (that means every speaker has his own amp) you'll need a hu with an active x-over (so you can divide the frequencies). Than you can use a 5 channel amp (1 channel for the sub, 2 channels for the 2 woofers in the door, 2 channels for the tweeters), or you can use the integrated amp of the hu for the tweeters and add a 4 channel amp. I would not recommend to run the door woofers over the hu amps, but that is also a possibility. In that configuration (run door woofers and tweeters over the integrated hu amps) you can use an sub with an integrated amp.
You see - there are many many many possibilities. Difference is cost and sound quality. Look for a good car hifi guy. Thell him what music you'll like and how much you want to spend. He should show you a lot of alternatives.