Integrating an Alpine unit into a Bose Beta System W140

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Giles
300 SL Gullwing
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Integrating an Alpine unit into a Bose Beta System W140

Post by Giles » Tue 13 Jan, 2015 12:30 pm

Hi guys,

Nelson, my W140 UK import had the Becker 1432 preamp head unit, the tuner and Bose amp in the boot. I no longer the HU or tuner and wish to delete the Bose amp. The car still retains 9 of the 11 speaker Bose system,

I require the schematic diagram on Bose Beta system for a W140 1991. I'm intending on fitting an aftermarket Head unit and fit a more modern/user friendly amp in the boot.

My main aim is to find out whether the fader in the centre console fades between the front and rear doors. This being so, I should be able to cable directly from the head unit to the fader via speaker output. The Bose speakers are 2 ohms so I also assume that these are wired in series thus creating 4 ohms.

There are already installed RCA cables which I'll wire to a four channel amp in the boot. There are four speakers in the rear shelf, being 2 x OEM Bose small subs I assume and two after market Alpines. The 4 channel amp will connect directly to these four speakers. There is also two trigger wires from the console to the boot, one I would assume is for a previous after market amp and the other for the antenna. If anyone can confirm my thoughts it would be appreciated.

Regards,

Giles
Last edited by Giles on Sat 17 Jan, 2015 2:06 pm, edited 1 time in total.
1981 500SLC (Colour Black) Keeper car Lola
1975 280CE Signal Red Long term Project Ginger
1999 W163 ML430 MB Search & Rescue Vehicle Mary-Lou
1987 W126 420SEL Melb based long hauler Erwin

http://www.kudoscc.com.au

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Giles
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Re: Wanted Bose Beta W140 schematic

Post by Giles » Tue 13 Jan, 2015 4:08 pm

It is amazing what you can do in a lunch break. Schematic sorted, thanks to the team at Mercedes Bunbury.
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Giles
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1981 500SLC (Colour Black) Keeper car Lola
1975 280CE Signal Red Long term Project Ginger
1999 W163 ML430 MB Search & Rescue Vehicle Mary-Lou
1987 W126 420SEL Melb based long hauler Erwin

http://www.kudoscc.com.au

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Giles
300 SL Gullwing
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Re: Wanted Bose Beta W140 schematic

Post by Giles » Fri 16 Jan, 2015 8:20 am

Well my theory proved to be incorrect. All speaker wires run directly to the speakers from the amp. The fader acts as a choke/mute of some sort.
I've tested the Bose amp and it's no good.
I've purchased two el cheapo four channel amps which I'll connect to a simple head unit for now. I'll have to splice into the multi pin connector that went to the Bose amp but the schematic clearly shows what I need.
Stay tuned, this I'll attempt this on the weekend.

Giles
1981 500SLC (Colour Black) Keeper car Lola
1975 280CE Signal Red Long term Project Ginger
1999 W163 ML430 MB Search & Rescue Vehicle Mary-Lou
1987 W126 420SEL Melb based long hauler Erwin

http://www.kudoscc.com.au

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Giles
300 SL Gullwing
Posts: 3027
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Re: Wanted Bose Beta W140 schematic

Post by Giles » Sat 17 Jan, 2015 2:03 pm

Head unit in. Next challenge will be tapping into the loom for the speakers.
I've triggered the aerial, connected the 3 pairs of RCA's & run the mic for the hands free to the LHS of the centre console.
image.jpg
Giles
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1981 500SLC (Colour Black) Keeper car Lola
1975 280CE Signal Red Long term Project Ginger
1999 W163 ML430 MB Search & Rescue Vehicle Mary-Lou
1987 W126 420SEL Melb based long hauler Erwin

http://www.kudoscc.com.au

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Ivanerrol
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Re: Integrating an Alpine unit into a Bose Beta System W140

Post by Ivanerrol » Sat 17 Jan, 2015 10:28 pm

Does the operating manual mention that the Bose speakers are 2 ohm?
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Giles
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Re: Integrating an Alpine unit into a Bose Beta System W140

Post by Giles » Sun 18 Jan, 2015 12:30 am

Ivanerrol wrote:Does the operating manual mention that the Bose speakers are 2 ohm?
Yes. The Alpine head unit is being utilised as a preamp. They'll be be be 2x power amps in the boot. Plenty of head room in the one amp I've installed this afternoon.Looks like the only ones I'll keep will be the speakers in the front doors, the rest are pretty average in my mind. I'd describe them as paper cone Pulp Fiction. It's the acoustics of the car that makes for the sound quality, not the Bose speakers. They're flat and unlife like, much like the consumer that buys their product.

As most Bose speakers are of a lower impedance than most, it generally makes amps run hotter. Their home speaker cubes and bass boxes are 4 ohm, sold plenty of average home amps that have driven them for years. Hasn't stopped the masses from buying them, even if they're pretty average.

One amp in, one to go.
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Giles
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1981 500SLC (Colour Black) Keeper car Lola
1975 280CE Signal Red Long term Project Ginger
1999 W163 ML430 MB Search & Rescue Vehicle Mary-Lou
1987 W126 420SEL Melb based long hauler Erwin

http://www.kudoscc.com.au

User avatar
Giles
300 SL Gullwing
Posts: 3027
Joined: Mon 10 Nov, 2008 3:14 pm
Model you own: I own multiple different models
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Re: Integrating an Alpine unit into a Bose Beta System W140

Post by Giles » Mon 19 Jan, 2015 8:34 am

Bose amp 27 pin now changed to be universal.
Amp 1 will run front door splits and sub in the boot. Amp 2 will run four parcel shelf speakers and the two rear door speakers. Deleted the fader & rear vision mirror as no DSP/Dolby/DTS processing used.

I have removed the sunshade for the time being. It has two broken clips that attached the arms to the blind. Will reinstall it once repaired. This gave me a chance to attend to fixing the P.O.'s butchery of the parcel shelf. To his credit though he had run the 3 RCA leads, the antenna cable and an extra triggers wire, all which were necessary to run from the head unit to the boot.
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Giles
You do not have the required permissions to view the files attached to this post.
1981 500SLC (Colour Black) Keeper car Lola
1975 280CE Signal Red Long term Project Ginger
1999 W163 ML430 MB Search & Rescue Vehicle Mary-Lou
1987 W126 420SEL Melb based long hauler Erwin

http://www.kudoscc.com.au

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texasflysuperstar
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Re: Integrating an Alpine unit into a Bose Beta System W140

Post by texasflysuperstar » Sun 03 May, 2015 11:42 am

looks great, cleaned up and all hidden. love stealth installs.

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