Left Coast Geek

someone has been PM'ing me asking for info on speaker upgrades, and I'm trying to tell them that just replacing the speakers without replacing the amplification and built-in equalization will not work very well unless the new speakers have identical crossover characteristics as the OEM, whereupon why bother? I couldn't attach this PDF to the PM, so I'm doing it here.

phew, 14 or 15 speakers in the logic7 system, and ALL crossovers are integrated into the amplifier(s). on late model 212's (after 03-2015), there's no separate bass amplifier, the 4 door woofers + 2 woofers are directly driven by the main amp N40/3 (on earlier W212's, there's a 2nd amp N40/9).

edit: the first file is for code 811, the Bang and Olufsen premium system. it uses a single amp for all speakers including the sub.
the second file is for code 810, the Harman Kardon Logic7 system most US cars have. It does have a separate bass amp N40/9

Left Coast Geek

oh, thats the wiring diagram for code 811. HK Logic7 is code 810. I count 14 speakers in my wagon... a woofer and mid or tweeter in each of the 4 doors, a tweeter in the 'mirror triangle' on each front door, tweeters in the two rear pillars, the center dash speaker, and the subwoofer box under the rear deck

edit: ahhh, code 811 is the Bang and Olufsen super-premium system. oh, hah, most of the speakers are common, just a few are upgraded by the B&O, such as the front door midrange speaker... I'll fix the first post.

anglil22

Thank you for the information. Does anyone have a pdf with the crossover frequencies?

Left Coast Geek

I've never seen them. would likely require a lot of work to reverse engineer for all 12 speakers.

anglil22

Thanks

yiannossavva

I am trying to retrofit original subwoofer with power amp in my car

‘Anybody know what is the signal need to trigger the power amp?

Thanks

Left Coast Geek

The Logic7 system drives the amp with MOST optical digital.... The late 212s have a single amp with like 14 channels including the sub ... The earlier version ha a main amp plus a separate sub pamp, both connected with MOST.

yiannossavva

Yes i know, I don’t have external amplifier to my car, i want to install only the subwoofer, with subwoofer amplifier. I want to know what is the (signal) that i have to put to the amplifier to switch it on

Thanks

Left Coast Geek

What year/model car, which stereo options do you have? Wiring diagrams are best looked up by VIN but I'm camping and traveling the next two weeks so someone else will have to look it up in WIS. All USA model 212 have either Logic7 or the fancier system, these both have 13-14 speaker systems with amplifiers and an integral subwoofer.

anglil22

If you are asking about where to connect the blue remote wire to turn on the amp, it should be fuse number 71 which is the cigarette lighter. Here is a link which the fuse diagram for 2010-2016 E Class: https://fuse-box.info/mercedes-benz/...uses-and-relay

yiannossavva

I have the wis software, my car is w212 estate 10/2014 blueteck hybrid. I ask about pin 8 of the control unit N40/9, diagram show that this pin connected to the logic amplifier. I don’t have a logic amplifier. How i can to the sub amplifier to switch on.

Thanks

Left Coast Geek

If you don't have an amplifier, then that is the wrong circuit diagram for your car.

yiannossavva

Yes thats why i ask how can i use only the sub amplifier, just want to switch it on. What is the signal in pin 8, is a voltage or something else