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D2 - Sat Nav, ICE, Audio & TV All in car entertainment discussions |
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#1
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BOSE low level ?
Hi All,
Like many I am a little underwhelmed by the bass in the S8. Hence my decision to add a sub and amp. Install looks fairly simple (the battery location really helps) but I have a question regrading line converters. Having read various threads online there seems to be a discussion about whether I need to use a line converter or not? I suppose the question is whether the signal to the Bose sub is low level already, I am tempted just to adapt some RCA's and splice them into the sub speaker cables rather than using a converter. I am concerned that if they are already low level inputs the converter would just add more unnecessary lowering of the input. Also if I go down this route, could someone please clarify the wiring from the speaker cable into the RCA. Every guide I see online uses both speaker cables to a single RCA (Sheild negative, centre positive etc.), where as I need both RCA into the amp. Do i just ground the shields from each RCS to avoid noise interference? Thanks in advance. Tom Last edited by Tomson; 12th September 2017 at 12:56 PM. |
#2
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The Bose signals are low level already. You can just tap in to the existing inputs to the Bose amp and feed another amp straight from them, no converter needed.
The Bose wiring has four channels and a single shield connection which is *not* body ground - its a floating ground for the audio channels. Connect your RCA centre pins to the wires for the rear speakers, and the shield to the audio ground in the Bose harness (I think its white, not 100% though). If your amp ties its RCA grounds to body ground you may get some interference, in which case you'll need to use an isolation transformer. You can get those online. |
#3
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Quote:
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#4
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That's the basic difference between the Bose and non-Bose setups in a D2 and the relevant settings inside the RNS (and wiring connectors) are changed to reflect this.
Bose - 4-channel low-level line out to the Bose amp which then drives all speakers. Non-Bose - front (door) speakers directly driven from RNS, rears are low-level line out to amplifier(s?) built into the rear shelf speakers which then drive the rear doors as well. At least that's what I understand, but I may be corrected.... I think the connector label on the RNS even shows that only the front speaker connectors are available for use; line-out (all 4 ) is a separate block anyway.
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.). 2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation". (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one! Finally: gone, but not forgotten..... 1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors. e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course. (internal dimming mirror added later) 1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer. And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850! Last edited by HPsauce; 12th September 2017 at 01:52 PM. |
#5
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Does anyone have a wiring diagram for the Bose harness?
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#6
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One of these (attached) should cover it, depending on the year of your S8. If you search the PDFs for 'bose', there's numerous relevant pages. Check the page heading though to make sure you're looking at the A8 and not the A6.
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Mark ------------------------------------------------------ 2002 FE S8 Ebony Black Pearl ------------------------------------------------------ ------------------------------------------------------ Cars Owned: The Tesla Era: 2020 Model S Performance Ludicrous+ (present) (Black, with all black premium interior and carbon fibre décor, 21" sonic carbon twin turbine wheels and FSD capability) The Audi Era: '97 A8 4.2 (Ming Blue) --> '96 A8 4.2 QS (Dark Green) --> '02 FE S8 (present) The Citroen Era: '84 BX 1.6 RS --> '89 BX 1.9 DTR Turbo --> '94 XM 2.0L Turbo --> '96 XM 2.0L Turbo Exclusive --> '00 Xantia Activa 2.0L Turbo The Banger Era: '76 1.2L Lada VAZ-2101 (Ruski Fiat 124) --> '80 1.7L Morris Ital HL, finished in Ermine White and Rust |
#7
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Honestly, I must finally get around to understanding the wiring diagrams. I must say that I am struggling to understand them.
I did find this on posted by Audinutt on Quattroworld that suggests this is the Pin layout for the connector. (attached) The diagram is labelled as from a 2000 S4, but I assume original poster knows he stuff! If I was taking this as my reference I would use the rear line levels left and right to connect to my left and right on the RCA centre cable, and connect the shielded cables from both RCA to the Line Level common ground. I would also use the switched power as a feed for my remote turn on. Does this sound about right, makes sense in my mind anyways. |
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