GobesC300

I am going to install a sub and amp in my trunk next week. The professional wants to do line level inputs to the amp from the back speakers. I am worried the amp is going to mess with the stock speakers and maybe even the car's electrical system. Should I be worried?

kevinwithdabenz

i think you should be fine, i ran my wires from the back of the head unit and have no problems

wnunez89

mine was connected to the factory amp and i had issues with the amp overheating/blowing fuses and then voltage issues. but others have been fine with their set-ups

GobesC300

Did you have a professional install? The head unit is incorporated into the entire dash...seems like a nightmare

M-bENZ

tap it to your stock sub or directly to your stock amp.

wnunez89

yes sir pro installed. their biggest issue at the time was i was gonna switch out all speakers to DD component speakers but i opted out when they said it was gonna be a pain with all the fiber-optics

wnunez89

i just realized your in jupiter call serious autosport ask for Evan, tell him Will with the c350 told you to call, he'll take care of you. 561-429-6900

GobesC300

Wow, good looking out Will...Thanks

wnunez89

no problem, always out to help a local MB enthusiast

Richie999

I need exactly what Gobes is after but cannot find any legit installers in PHX...

howie

that's normal to do it this way, shouldn't be a problem at all. You have to use a line level input either way so where it's located doesn't really make a difference.

Richie999

Gang - does this type of install impact the factory Mercedes warranty?

howie

not if they don't know about it. Plus it has nothing to do with any of the factory equipment. You're simply tapping the pos and neg speaker leads of 1 speaker just to get signal for the RCA on the amp. Shouldn't affect your warranty at all but u know how that goes once u have an issue and are at the dealer

Acapulco Bill

Subwoofer input: if its DIY taking the signal from the right rear speaker, for under 150 hZ it hardly matters, and run it to meet up with the hot 12V line at the right side of the trunk.

For a pro install, might as well get the full Monte with the line level outputs.

Of course you are going to replace the stock speakers with Infinity Kappa's (unless you are adding a sub to the HK)?

kevinwithdabenz

can you share a link to the kappa you recommend?

AskDrTodd

Which is the best speaker wire to tap for a sub input, and where is that wire? Is there one in the trunk?

jimmythegreek

If you have HK you can tap in the trunk for sub input, the stock sub in middle is dual voice coil, just steal it from there and eliminate its power, you have real subs now.

If you have basic audio, you can either install a low level adapter behind the head unit and run RCAs thru the car, OR you can jump from the rear speakers in the B pillar or below them. I did B pillars on mine. The head unit comes out w special tool or a wire clothes hanger with the proper bends, if you search theres a thread showing removal in the DIY area

I used a MTX reQ so I could add another amp and did it in the trunk so I could adjust it otherwise I would have done the head unit in back

Acapulco Bill

@kevinwithdabenz: A long thread, but tons of info and some photos.

https://mbworld.org/forums/c-class-w...r-upgrade.html

howie

any speaker lead will provide signal