B8.5 B&O audio documentation/specifications?

[letterk]

When I bought my '13 S4 I found a blown speaker in the front passenger side. They swapped it out for a new speaker quickly. Pretty easy to diagnose. I'm aware of the complaints on the B&O setup, but think there is still something wrong. For instance, people in the back seat say they don't hear much and everything is coming from the front. I have the fader set to dead center. When I play around with the setting, there is a significantly different sound profile depending on position. For instance, when set to far extreme rear drivers side, the volume is weak and no base. Rear passenger side and the base comes back, but muddy and not nearly as strong as when it's put in the extreme front drivers or passenger. Do I still have something wrong or is this normal?

[Pyromatic177]

Well most of the speakers are up front but that does not sound normal. Obviously we all know this system has no bass but there should be a decent amount of Clear Audio in the rear.

[Drunktank]

I remember reading a thread somewhere (maybe Slacktide's?) which said the fader effects the sub. I find this to be poorly put together system with speakers run in parallel, no or insufficient crossovers, sub affected by fader, etc.

[doug97gxe]

Well... I knew it wouldn't be long before I got the car audio itch. The B&O system just isn't cutting it for me. Good news for people looking to upgrade, I'm likely going to sell all the old B&O speakers. Bad news for me, I think I'm going to be spending some $$.

Anyhow, has anyone tackled this yet? I've compiled a list of the wiring I may possibly need using the B8 A5/S5 B&O diagram.

Connection From Amp - J525	BitOne Input	Speaker	Connector	Pin	Color	Notes
Center Speaker +	CH1 +	R158	T32h	5	Blue/White	Changes to Blue/White at T17c, Pin 15
Center Speaker -	CH1 -	R158	T32h	17	Black/White	Changes to Black/White at T17c, Pin 17
Front Left Tweeter +	Use Combined	R20	T27a	11	Red/Blue	B101, Positive Front Left Speaker (Main Harness), not needed for BitOne
Front Left Tweeter -	Use Combined	R20	T27a	24	Brown/Blue	B102, Negative Front Left Speaker (Main Harness), not needed for BitOne
Front Left Midrange +	Use Combined	R103	T17d	15	Red/Green	B101, Positive Front Left Speaker (Main Harness), not needed for BitOne
Front Left Midrange -	Use Combined	R103	T17d	17	Brown/Green	B102, Negative Front Left Speaker (Main Harness), not needed for BitOne
Front Left Tweeter/Midrange +	CH2 +	R20/R103	T32h	6	Red/Blue	Shared with R20, R103, contains combined signal
Front Left Tweeter/Midrange -	CH2 -	R20/R103	T32h	18	Brown/Blue	Shared with R20, R103, contains combined signal
Front Left Midbass +	CH3 +	R21	T32h	23	Red/Blue	Changes to Red /Blue at T27a, Pin 20 (Main Harness)
Front Left Midbass -	CH3 -	R21	T32h	28	Brown/Blue	Changes to Brown/Blue at T27a, Pin 22 (Main Harness)
Front Right Tweeter +	Use Combined	R22	T27c	11	Blue/White	B103, Positive Front Right Speaker (Main Harness), not needed for BitOne
Front Right Tweeter -	Use Combined	R22	T27c	24	Black/White	B104, Negative Front Right Speaker (Main Harness), not neeeded for BitOne
Front Right Midrange +	Use Combined	R104	T17f	15	Red/White	B103, Positive Front Right Speaker (Main Harness), not needed for BitOne
Front Right Midrange -	Use Combined	R104	T17f	17	Brown/White	B104, Negative Front Right Speaker (Main Harness), not neeeded for BitOne
Front Right Tweeter/Midrange +	CH4 +	R22/R104	T32h	5	Red/Yellow	Shared with R22, R104, contains combined signal
Front Right Tweeter/Midrange -	CH4 -	R22/R104	T32h	19	Brown/Yellow	Shared with R22, R104, contains combined signal
Front Right Midbass +	CH5 +	R23	T32h	10	Red/Yellow	Changes to Red/Blue at T27c, Pin 20 (Main Harness)
Front Right Midbass -	CH5 -	R23	T32h	22	Brown/Yellow	Changes to Brown/Blue at T27c, Pin 22 (Main Harness)
Rear Left Tweeter +	Use Combined	R14	B487	23	Red/Violet	Shared with R159, not needed for BitOne
Rear Left Tweeter -	Use Combined	R14	B486	22	Brown/Violet	Shared with R159, not needed for BitOne
Rear Left Midrange +	x	R105	T32h	8	Red/Gray
Rear Left Midrange -	x	R105	T32h	20	Brown/Gray
Rear Left Midbass +	CH6 +	R159	T32h	3	Red/Violet	Shared with R14, contains full signal
Rear Left Midbass -	CH6 -	R159	T32h	15	Brown/Violet	Shared with R14, contains full signal
Rear Right Tweeter +	Use Combined	R16	B485	21	White/Green	Shared with R160, not needed for BitOne
Rear Right Tweeter -	Use Combined	R16	B484	20	Blue/Green	Shared with R160, not needed for BitOne
Rear Right Midrange +	x	R106	T32h	9	Red/Gray
Rear Right Midrange -	x	R106	T32h	21	Brown/Gray
Rear Right Midbass +	CH7 +	R160	T32h	4	White/Green	Shared with R16, contains full signal
Rear Right Midbass -	CH7 -	R160	T32h	16	Blue/Green	Shared with R16, contains full signal
Subwoofer +	CH8 +	R157	T32h	25	White/Yellow
Subwoofer -	CH8 -	R157	T32h	30	Blue/Yellow

Man does the table function suck! Next time I'm posting a PDF.....

If my theory and wiring chart is correct, you should be able to use this to wire up other processors (MS8) or LOC for your subwoofer, etc. You will want to use the "full" or "combined" signals wherever possible. After looking at the B&O schematic, it looks like there are things like microphone and telephone mute that go through the amp, so it doesn't look like it's a great idea to remove the amp completely in favor of a device like the Mobridge (though straight digital to digital sounds AWESOME!)

I realize I'm not 100% experienced in the Audi realm of car audio yet, so please forgive me if I've made an error above. I won't be able to confirm anything until I actually begin install. However, I hope to be building an awesome SQ install that gets plenty loud.

I will be using the factory locations for most speakers in the car and I will be removing the additional midranges and tweeters in the rear. I will be utilizing the rear midbass locations for some full range 6", removing the stock B&O sub to replace with some sort of sub stage, replacing the front midbasses with 7 or 8" speakers (based on depth), 1" tweets in the sails, 3" midrange on dash, and a 3" midrange in center. As I'm out of speaker outputs for the rear speakers, I might just run them from the factory amp, or run an Audio Authority 3xs to split up the front stage further and give me a couple more outputs for those rears.

Confused yet?

Stay tuned....The B8 would be the second OEM integrated install I've done, so we'll see where it takes me.

......................

[Lamprey]

Sounds like you might have an issue. But, you may want to check which sound focus "profile" you are set too. There are different setting like: Driver, Front, Rear and All. Each can change the sound pretty dramatically.

[jimrobbington]

Sounds like you might have an issue. But, you may want to check which sound focus "profile" you are set too. There are different setting like: Driver, Front, Rear and All. Each can change the sound pretty dramatically.

Was going to say the same.