Question about the base sound system footwell subwoofer
Thread Starter
Newbie
Joined: May 2026
Posts: 4
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From: Monza e Brianza, Italy
Waiting for a W206 C220D AMG Advanced Plus 4MATIC
Question about the base sound system footwell subwoofer
Hello everyone,
I am waiting for delivery of a 2026 Mercedes W206 C-Class equipped with the standard/base audio system (non-Burmester).
I am planning a DSP-based upgrade using a PUZU Pz-C7 DSP amplifier while keeping the installation as OEM-looking as possible. Before the car arrives, I am trying to understand how the factory system is actually configured, especially regarding the front footwell woofers ("FrontBass").
I have found conflicting information online and would appreciate input from anyone who has measured, upgraded, or reverse-engineered the W206 base audio system.
My main questions are:
Any measurements, photos, wiring diagrams, or technical details would be greatly appreciated.
Thank you!
I am waiting for delivery of a 2026 Mercedes W206 C-Class equipped with the standard/base audio system (non-Burmester).
I am planning a DSP-based upgrade using a PUZU Pz-C7 DSP amplifier while keeping the installation as OEM-looking as possible. Before the car arrives, I am trying to understand how the factory system is actually configured, especially regarding the front footwell woofers ("FrontBass").
I have found conflicting information online and would appreciate input from anyone who has measured, upgraded, or reverse-engineered the W206 base audio system.
My main questions are:
- Are the footwell woofers driven by a dedicated amplifier channel, or are they simply connected in parallel with the door speakers?
- Does anyone know the factory crossover points (or has measured them)?
- What is the impedance of the factory footwell woofers?
- Has anyone measured the frequency response of the footwell woofers separately?
- Does the factory system apply any DSP processing, EQ, or time alignment to the footwell channels?
- Has anyone upgraded only the footwell woofers while keeping the rest of the system stock? If so, what were the results?
- Does anyone have wiring diagrams, pinouts, service documentation, or REW measurements related to the W206 base audio system?
Any measurements, photos, wiring diagrams, or technical details would be greatly appreciated.
Thank you!
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All of the available information re upgrading the sound system can be found on motor-talk.de on a thread called "Soundsystem Serie / Advanced / Burmester 3D-Surround". You won't find anyone here on MBWorld with most of the information you seek. There's probably 3 people on the thread I linked who might be able to answer some of your questions. I believe the front woofers have a "dedicated amplifier channel" but that's just the head unit which delivers a total of 125w to all speakers. I've done a full audio build and run REW on it with a UMIK-1 but didn't bother with doing it when stock.
For reference the most common audio upgrade on the 206 is doing a Match Up 8 Amp/DSP + Helix i3/match front woofers.
For reference the most common audio upgrade on the 206 is doing a Match Up 8 Amp/DSP + Helix i3/match front woofers.
Thread Starter
Newbie
Joined: May 2026
Posts: 4
Likes: 2
From: Monza e Brianza, Italy
Waiting for a W206 C220D AMG Advanced Plus 4MATIC
Hello UrBusted, many thanks for your reply and the supplied information. I had found a similar thread somewhere, but not this one -- thanks.
Unfortunately, it looks like not many info are available on the base system. Since some time I'm looking for the circuit diagram of the W206 base system, but I have not been able to find it so far.
My interest for the footwell subwoofer is due to how I will modify the base system. I will use a Puzu Pz-c7 DSP/amplifier, which has a 4 high-level inputs and a 6 outputs (4 high + 2 RCA low level). It gets the 4 high level inputs by means a dedicated harness /y shaped) which connects to the Mercedes OEM unit, goes to the DSP and then back into the original W206 cables.
So, if the DSP is taking the 4 inputs for the 4 channels from the base OEM system, I'm wondering from where the footwell signal comes, and where it goes, using the dedicated harness. In a few days, I will receive the cable from Puzu, but I don't have the cable schematics. Maybe I can ask them to provide one.
My car will be a rented car, so I need to be able to revert it to stock pretty perfectly. In my case also the ratio between quality and cost is extremely important.
I will certainly add the tweeters to the base system. Based on what REW's output is of the stock system, I may decide to replace also the midrange in the front doors.
I'm certainly not an expert in using REW, but I did a few upgrades in the past, and by using REW and the tools I have, I have been able to reach satisfying results and meet my personal audio preferences.
Unfortunately, it looks like not many info are available on the base system. Since some time I'm looking for the circuit diagram of the W206 base system, but I have not been able to find it so far.
My interest for the footwell subwoofer is due to how I will modify the base system. I will use a Puzu Pz-c7 DSP/amplifier, which has a 4 high-level inputs and a 6 outputs (4 high + 2 RCA low level). It gets the 4 high level inputs by means a dedicated harness /y shaped) which connects to the Mercedes OEM unit, goes to the DSP and then back into the original W206 cables.
So, if the DSP is taking the 4 inputs for the 4 channels from the base OEM system, I'm wondering from where the footwell signal comes, and where it goes, using the dedicated harness. In a few days, I will receive the cable from Puzu, but I don't have the cable schematics. Maybe I can ask them to provide one.
My car will be a rented car, so I need to be able to revert it to stock pretty perfectly. In my case also the ratio between quality and cost is extremely important.
I will certainly add the tweeters to the base system. Based on what REW's output is of the stock system, I may decide to replace also the midrange in the front doors.
I'm certainly not an expert in using REW, but I did a few upgrades in the past, and by using REW and the tools I have, I have been able to reach satisfying results and meet my personal audio preferences.
