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Discussion Starter #1
Hi i have a 1999 230k auto with stock front speakers only fitted was wondering how easy is it to fit some extra rear speakers. I have already got a Sony Xplod head unit in the car but need more sound is it easy to fit rear speakers ?

Dave
 

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It is possible but quite long winded to fit rear speakers. There are places for them but only for the Bose subwoofers supplied with the upgrade. If you do a search there are several threads, some with pictures that may help.

Myself, I plan on putting some subs in the back at some point, but with my current Sony head unit and Focal 165V30 speakers (lots of Dynamat on the door) there is no rush. Plenty of bass, a good soundstage and fantastic clarity - I don't really beed any more (for the moment). I am just enjoying it for now.
 

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Premium Member 2004 SLK200K
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When I had my r170 I installed some speakers in the rear in a relatively easy way ! If you do a search you'll find images of the spaces underneath the carpets behind the seats . All I did was introduce the wiring into the radio connectors and run it past the gear shift into the centre console and from there down and behind the carpet to the desired aera on each side . There are a couple tutorials about which go along the line of removing all the carpet and installing wooden suplements etc to fix the speakers to , but I just did he following :
Find the place where the speaker spaces are in the bulkhead and then cut a hole in the carpet the size of the ( normal round ) speakers , slightly smaller than the inside measurement of the screw holes of the speakers ( logic will dictate the size of the hole when you look at the speakers ) . Then placing the usual metal bits used to hold speakers in place , behind the carpet and the speaker in front , screw through the carpet into the clips to fix the speakers in !
The carpet is quite thick and more than strong enough to support the weight of a normal speaker and there should be no vibrations etc as the carpet acts as a dampner . Then just run the wires up behind the carpet and connect to the speakers .
 

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. . . Then just run the wires up behind the carpet and connect to the speakers .
But how did it sound???? :) Better, worse, the same as stock?

You in essence added a rear pair of full range speakers but subtracted the front speakers' woofers. (If you had the Bose??) I'm not sure how the frequency dividers work on the OEM system, (I think it was mostly in the amp) but the lower door speakers are pretty good sized for a midrange so they should have been able to carry some bass - if they got any.

Or one could replace the door speakers with some slightly better ones which should give more discrete contol over the sound sourcing . . . (i.e. FR/FL, RR/RL. Assuming you are using an aftermarket HU with four channels of sound.)

Curious minds want to know.
 

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Premium Member 2004 SLK200K
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No I didn't have an OEM head unit , the same as NaffDave doesn't . I had a head unit with 4x60W output , so I wired into the rear connector for the rear speaker output ! The sound was actually very good for just being some normal cheapish speakers and greatly improved by being front and back .
 

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No I didn't have an OEM head unit . . .
I don't either now, but my HU allows me to run the "rear" channels as (sub) woofers so I'm almost able to duplicate the OEM/Bose setup . . . Took me a bit to figure the wiring though. Initially, I wasn't pumping much to the woofers and it sounded as if I had tin cans as speakers. Now, it sounds at least as good as the original, plus I do have more power to drive it, and I get all the bells and whistles of a new HU. So, not "audiophile" but a nice upgrade with minimal work.

I will probably try to replace the "mid ranges" in the doors with some fuller range speakers when I work on my door panels. I don't expect a lot of this, but they will be newer speakers and it might be interesting to see what difference it could make. Then I'll do something about the rears later on.
 

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I will probably try to replace the "mid ranges" in the doors with some fuller range speakers when I work on my door panels. I don't expect a lot of this, but they will be newer speakers and it might be interesting to see what difference it could make. Then I'll do something about the rears later on.
If I remember correctly, we have almost identical front ends, but yours has bluetooth as well. I still have not put the rears in, but the Focal 6 1/2 inch door speakers go very deep for their size, and on some songs I can feel the bass (slightly) in my chest. The tone is set flat with Loudness on. The quality of the sound is comparable to my B&W CDM1NT monitors at home.

The key to the doors is Dynamat (or similar). You need to cover as much of the door panel as possible (see Murat's pictures on the other thread). Forget the outer door skin. If you do this, I think any half decent 6 1/2 inch will give you good strong bass in the front. Keep in mind that if a bass driver is new it takes a good few hours to loosen up and perform it's best (and deepest).
 

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Discussion Starter #8
The key to the doors is Dynamat (or similar). You need to cover as much of the door panel as possible (see Murat's pictures on the other thread). Forget the outer door skin.

I always thought its the door skin you should Dynamat ? ive never used the stuff but does it really make a big difference

Dave :bannana:
 

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If you put Dynamat on the door skins, it helps quieten road noise and helps to stop rattles. However, the actual speaker driver is still running in free air. This means that sound waves from the back of the speaker cone can cancel out sound waves from the front of the cone. The same reason if you are holding the speaker in your hand and watching the cone move but there is no bass. The trick to good bass is in keeping as much of the "sound" from the back of the driver away from the front.
 

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Disagree with Curro101; I think the speaker needs a firm basis so it can shift the air and get a good bass note. Although the carpet is quite firm, and I have used it as separation for my "infinite" baffle cabinet, I do wonder if the support is enough for the speaker mount. My puny 6" are mounted on 1/2" MDF platform.
Agree with PMB, that good separation (along with good support) is needed to get the kick of the bass from the speaker. It's OK for the tweeters and mid range, they do not need to shift air in the same way a sub does.

Looking at the installation on the R171, in the door there is a big sub (8", I think) that is mounted reversed (magnet out).
In an upgrade thread, these were replaced with better speakers, but mounted the same way, and only mod from traditional was to wire the sub out of phase (so the air movement was in phase).

I seem to remember someone mentioning that the same is done on the R170, so the clearance behind the hole that the magnet would go into is not important.

So I'm looking at my rear speaker installation, and wondering.
Should I get the 5"x7" and mount them inverted? This would then use the bulkhead as separation, and also as strong a mount as can be obtained. Only down side is that the cone creates a pressure spot, and this would be wasted into the bulkhead zone.
But then many sub speakers are downward firing, and seem to use the port for the best impact.
Wonder where the port of the chamber behind the bulkhead is?
And how will I mount the speaker grille for the rear speakers? Perhaps the existing speaker mount frame will provide that fixture!
 

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SLK Rear Speakers

Just bringing this thread back to life to see if there is any fresh news on this.

I have a 2002 SLK 230 with no rears, Thinking of bunging in a pair of Alpine SPG-17C2 17cm 240W speakers in there. Have a 4x 50w Pioneer Head Unit.

Am I right in thinking there is redundant wires there already?

Does anyone know of a 'show and tell' site with pretty pictures showing the process?

Thanks
 

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Administrator 2009 SLK 55 AMG/Founding Member 2006
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Always better to start a new thread

Posters in this 7 year old thread might be long gone
 

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Just bringing this thread back to life to see if there is any fresh news on this.

I have a 2002 SLK 230 with no rears, Thinking of bunging in a pair of Alpine SPG-17C2 17cm 240W speakers in there. Have a 4x 50w Pioneer Head Unit.

Am I right in thinking there is redundant wires there already?

Does anyone know of a 'show and tell' site with pretty pictures showing the process?

Thanks
Chap.


Jeff's right. There are plenty of newer threads in the forum about speakers in the SLK - or start your own. Much easier for everyone.
 

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Premium Member 2002 SLK320
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While awaiting your new thread, I would say that in my opinion adding additional speakers in the rear is not really the best way to go - at least initially. The front speakers can be improved on significantly. I replaced my head unit with a new one. I added an amplifier in the passenger footwell (where the Bose amplifier sits for those that have one) and some decent split system speakers into the door. The difference was amazing. It goes loud. And the bass is fair (the door mirrors aren't much use). I wish I had used Dynamat, but like some people, in my ignorance I would have fitted it to the door outer door skin (it might have made the door mirrors more stable). My head unit was a decent output 4x50W) but the amplifier made a big difference.



I would suggest thinking along these lines and fit rear speakers later if you want.
 

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Here's a vid of someone who did it.

It seems like a lot of work for mediocre results. High frequencies are very directional and with the drivers pointed at the back of the seats, I think you'd get loud mud so to speak. Bass frequencies are much more omni directional which is why bose stuck those wimpy subs there. As mentioned above, upgrading the door speakers and powering them properly would give you much more bang for your buck.
 

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Registered 2000 SLK200K
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Hello Knock on. I did the same thing as Curro111 and it went very well and I do not need to install amplifiers. But try to install a rather small and shallow speaker. I recommend a speaker of about 45w rms if you have the original radio. Greetings.
 

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Just bringing this thread back to life to see if there is any fresh news on this.

I have a 2002 SLK 230 with no rears, Thinking of bunging in a pair of Alpine SPG-17C2 17cm 240W speakers in there. Have a 4x 50w Pioneer Head Unit.

Am I right in thinking there is redundant wires there already?

Does anyone know of a 'show and tell' site with pretty pictures showing the process?

Thanks
Hey Knock-on! I have not posted here for years but saw your post. You can see my previous posts above. All I can really add is that, firstly, there is no existing, useable rear wiring. Secondly, Bose made a purpose made sub that fits in the back, times 2. I tried them, and they are "just ok". However, take away from the clarity possible from fronts alone with even just a head unit. The Alpines you mention will fit the bill well up front, especially if you use Dynamat. I use them in my wife's Mini. Good bass. Make sure you replace the tweeters in the doors. Does not have to be the Alpines. You can get much better add-ons. Good luck with it!
 
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