Join Date: May 2019
Location: East Mids
Vehicle: SLK 200 (R171) Iridium Silver/Black Leather Interior. No Mods, 2006.
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Front Speaker Replacement Query
Bought an '06 R171 three weeks ago but it had blown woofers in the front doors. Dealer has just replaced them with Phillips PHICSP630 three-way speakers. (I didn't have a say in the replacement speakers or fitting as I left that to the garage and their expertise. (not a Merc garage))
So far so good!
Before the car went in I had a look to see what was actually behind those large grilles etc to see if it was in fact the woofers or something else such as loose/ frayed/ corroded wiring etc. All looked brand new apart from obviously knackered paper on both woofers - definitely the culprits.
As you experts know, there were two speakers mounted in a single bracket per door, which have a copper 'crossover(?)' mounted in between to which there was a wire coming from the door feed into it and then from that into the woofer connector.
When i jiggled the paper cone, it sort of connected and there was a lovely bass sound, my heart leapt as together with the other door speakers it sounded pretty damn good for OEM.
But here is the problem...
Since replacing these blown woofers, the sound is way lacking in that lovely balanced bass that the original woofers put out (when I held my finger on the busted paper cones.)
Very mid-rangey sound and virtually no bass with the roof down, just a lot of harsh midrange and treble. The woofers are working but they don't even come close to sounding like 'bass' let alone the richness of the knackered OEMs.
So last night I whipped the door off the N/S to see if it was a simple phasing issue and just needed a quick swap to the wiring.
First up, the copper crossover is now gone and in it's place is an odd wiring combo that I just can't figure out.
The pictures should hopefully show you what i'm worried about....which is;
......was the copper crossover the item that was 'channeling' the bass-only elements to the big woofer, which then allowed the midrange and tweeters to handle their elements perfectly in balance with the woofer? Has removing the crossover simply made the whole door one big midrange / tweeter with only a bit of bass coming out of the woofer( which is actually a three way coax)????
Even if i turn the Audio 20 up to near full power, the sound is loud yes, but it's almost all midrange and treble. I think as the wiring loom from the Audio 20 is now going unfiltered to both the lower door speakers they are, essentially working together to produce the same sound.....by turning up the whole system, all I am doing is driving the woofer ( which is basically a three way ) to generate the bass parts of a three way, but at the same time chuking the same volume into the little mid range as weel as the door tweeter and the rees seatbelt tweeter, in other words just basically filling the car up with mid to treb and the bass gets totally lost in that three way as the other 7 speakers are all predominantly mid/ trebs??
Does this read right and would it explain the serious lack of bass but serious bias of mid and treble , creating a very brash sound.
I would welcome anyone advice on how to rectify this as the car is lovely, I just wish I could slam on some loud tunes and really enjoy the music too.
( i have no idea what the black wiring is coming out of the top of the Phillips to the connectors, perhaps they are the to get signals to the midrange and tweeter in the same single speaker????