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Old May 6, 2011 | 11:12 PM
  #1  
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sub and amp install

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?
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Old May 6, 2011 | 11:16 PM
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i think you should be fine, i ran my wires from the back of the head unit and have no problems
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Old May 6, 2011 | 11:16 PM
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Originally Posted by 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?
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
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Old May 6, 2011 | 11:20 PM
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Did you have a professional install? The head unit is incorporated into the entire dash...seems like a nightmare
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Old May 6, 2011 | 11:48 PM
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tap it to your stock sub or directly to your stock amp.
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Old May 7, 2011 | 12:08 AM
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Originally Posted by GobesC300
Did you have a professional install? The head unit is incorporated into the entire dash...seems like a nightmare
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
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Old May 7, 2011 | 12:10 AM
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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
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Old May 7, 2011 | 12:18 AM
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Wow, good looking out Will...Thanks
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Old May 7, 2011 | 12:25 AM
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no problem, always out to help a local MB enthusiast
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Old May 7, 2011 | 12:20 PM
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I need exactly what Gobes is after but cannot find any legit installers in PHX...
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Old May 7, 2011 | 12:28 PM
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Originally Posted by 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?
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.
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Old May 7, 2011 | 12:58 PM
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Gang - does this type of install impact the factory Mercedes warranty?
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Old May 7, 2011 | 03:54 PM
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Originally Posted by Richie999
Gang - does this type of install impact the factory Mercedes warranty?
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
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Old May 8, 2011 | 10:49 AM
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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)?

Last edited by Acapulco Bill; May 8, 2011 at 09:21 PM.
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Old May 8, 2011 | 12:15 PM
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Originally Posted by Acapulco Bill
Subwoofer input: if its DYI 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)?
can you share a link to the kappa you recommend?
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Old May 8, 2011 | 02:55 PM
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Which is the best speaker wire to tap for a sub input, and where is that wire? Is there one in the trunk?
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Old May 8, 2011 | 05:35 PM
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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
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Old May 8, 2011 | 09:22 PM
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@kevinwithdabenz: A long thread, but tons of info and some photos.

https://mbworld.org/forums/c-class-w...r-upgrade.html
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Old May 9, 2011 | 06:26 PM
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Originally Posted by AskDrTodd
Which is the best speaker wire to tap for a sub input, and where is that wire? Is there one in the trunk?
any speaker lead will provide signal
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