How to upgrade the base sound system
As for the Match P&P they say it only works on the W204 Audio20 but I found somewhere that the connectors are the same for Audio20 in W204 and W205 (and they look exactly the same).
If it doesn't work I'll try disassembling the yellow ISO from the stock connector. I think it can come out.
Are you doing an external sub/amp in the trunk?
So in your system with the Match DSP the website shows it as a straight DSP with low voltage RCA out, presumably for an amplifier. Did you need to buy an amp for your set up?
Edit: Found the version with the amp included.
The really cool thing about the Match is the available vehicle specific harness. Huge labor saver. Otherwise, on paper at least, it does seem to match the Audison in terms of power and features. How much for it plus the custom harness?
Last edited by Mike5215; Jun 17, 2016 at 10:04 PM.

I'm psyched to get my Focal KRS100 components installed next week. Audio shop said they can try to do some custom tuning. Eventually I want to get the rear doors done with either the KRS100's or the ES100K's without tweeters.
I thought about the Alpine DSP for $700 USD...but it does not have amp. My GLC is very similar to the W205, so I'm guessing the stock amp is under the center console. Vladar - how do you like the Focals in front???
Last edited by CA_GLC; Jun 19, 2016 at 11:57 AM.
The Best of Mercedes & AMG
I think a lot of owners think the answer to the A20 is high end speakers, but really you need to address the DSP first.
Last edited by Mike5215; Jun 19, 2016 at 04:12 PM.
I would just grab a set of used Harmon/Kardon tweets off eBay and run them off the 4" OEM door speakers.
, secretly waiting on vladarh harness fitting test xD of the match dsp one (do hope the harness for the w204 audio20 is the same as the w205). going by pics they do seem the same to me though.
IFBMW-S
IFBMW-C
IFBMW-SUB
Can get those for about 550EUR, just doubtful about the built in dept. Afaik:
front built in dept is larger than the rear doors (same on s205? I'll need to check that soonish). But the IFBMW-C will have a built in depth of about 5CM (according to the seller) with the same magnet diameter and afaik same depth as the Focal PC100 which someone tried to fit, and failed for the rear doors. :/
Any other suggestions for the speakers? at this point, I just want to replace the standard ones.

The 5DSP looks tiny but I like how it does not put out too much power and has the DSP built-in. Or I saw the PP41DSP had same 35W output for the 4 door speakers >
http://www.audiotec-fischer.de/lng/e.../pp-41dsp.html
You should go with the Focal KRS100 components if you can afford, many people here have done it. Rear doors are more iffy , less space. I might try the ES100K's later when I can afford it.
The 5DSP looks tiny but I like how it does not put out too much power and has the DSP built-in. Or I saw the PP41DSP had same 35W output for the 4 door speakers >
http://www.audiotec-fischer.de/lng/e.../pp-41dsp.html
You should go with the Focal KRS100 components if you can afford, many people here have done it. Rear doors are more iffy , less space. I might try the ES100K's later when I can afford it.
) supposedly with matching adapter for the audio20 (W204 Audio20 connection is supposedly the same as for the W205). But I don't think he tried to connect it yet. I haven't bought anything yet myself.I could do the Focal KRS100 components but did some reading on various threads and the pics where someone put the crossover: front door panel didn't match with someone else's front door panels
, drop ins just seem easier xD
. I need to get around taking off the front/rear door panels either this or next weekend to be sure of it all.Focal KRS100's will bump my front door speaker cost by 100EUR only (compared to the IFBMW-S), isn't that much, but is it really worth the money?
Last edited by Seranex; Jun 22, 2016 at 11:29 AM.
IFBMW-S
IFBMW-C
IFBMW-SUB
Can get those for about 550EUR, just doubtful about the built in dept. Afaik:
front built in dept is larger than the rear doors (same on s205? I'll need to check that soonish). But the IFBMW-C will have a built in depth of about 5CM (according to the seller) with the same magnet diameter and afaik same depth as the Focal PC100 which someone tried to fit, and failed for the rear doors. :/
Any other suggestions for the speakers? at this point, I just want to replace the standard ones.
I think the Focals (or anything decent) will be power-starved on that amp and the incremental improvement won't justify the cost. If you want the Focals, just do the fronts to get the tweeters and leave the rears stock. I'd do the KRS100 vs the drop in BMW type...just a minor mod on the mount, but much better tweets.
I think the Focals (or anything decent) will be power-starved on that amp and the incremental improvement won't justify the cost. If you want the Focals, just do the fronts to get the tweeters and leave the rears stock. I'd do the KRS100 vs the drop in BMW type...just a minor mod on the mount, but much better tweets.
Now for the bad news. The stock harness coming from the HU has 5 pairs of cables coming out of the 4x2 standard ISO connector. Before connecting the expensive amp I measured the resistance on all 5 pairs of wires coming out. The four regular pairs (FL, FR, RL, RR) all gave a result under 1ohm (too low for my multimeter) and the 5th pair gave 6,5ohm. Either my multimeter is seriously broken or there's something wrong with the connections. I'll go to my local audio shop to have it measured there.
What's even stranger is that when I disconnected the 5th pair (coming out of FL+ and FR-) the Audio 20 HU went into protected mode and turned off.
I don't get what's going on.
Last edited by vladarh; Jun 22, 2016 at 04:03 PM.
Are you hesitant to connect the amp due to the risk of overheating the amp given the low resistance? I think you'd be okay running it for a short period and see if it heats up.




