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      09-02-2012, 04:32 PM   #1
makkan00
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MS-8 connect to all 4 and no PDC gongs

Hi Guys,
Installed MS-8 and setup:
input all 4 channels to MS-8 this way
Ch1: FL
Ch2: FR
Ch3: FL (for underseat subs)
Ch4: FR (for underseat subs)
Ch5: RL
Ch6: RL

and output:
Ch1: to amp and to FL
Ch2: to amp and to FR
Ch3: to amp and FL sub
Ch4: to amp and FR sub
Ch5: to amp and RL
Ch6: to amp and RR
Ch7: to centre



I have also coded HU to hi-fi.
PDC gongs were there and now nill.
Is MS8 summing input signals?

I wonder if CH3 and CH4 (in input setup) are culprits?
Hi-fi coding
MS8 L7 processing

Has anybody had issues like this?
Any suggestions or solution?


Thanks.
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      09-02-2012, 04:58 PM   #2
kaigoss69
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This doesn't make sense. There is no "underseat" output with HiFi coding. If you recoded to HiFi, then you have 4 channels of full-range outputs from the HU. If you have PDC, then use all 4 channels, if not use front two.
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      09-02-2012, 05:09 PM   #3
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Quote:
Originally Posted by kaigoss69 View Post
This doesn't make sense. There is no "underseat" output with HiFi coding. If you recoded to HiFi, then you have 4 channels of full-range outputs from the HU. If you have PDC, then use all 4 channels, if not use front two.
Surely, you are correct. I thought to add two additional front channels to have output.
But during the setup I realised that output setup is not totally dependent on input channel.
So my starting point should be just four channels going in to MS8.

Kaigonss, surely I should have PDC sound even though I added two additonal input channels.
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      09-02-2012, 05:56 PM   #4
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No u wont because once ms-8 detects a low freq channel it thonks its done w inputs
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      09-02-2012, 06:16 PM   #5
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That's why the manual says to put the low frequency inputs on channels 7 and 8. Then it will sum everything. But please, ONLY use the balanced low-level HU outputs, or ONLY the high-level amp outputs, but never both.
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      09-03-2012, 01:30 AM   #6
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OK Guy, I guess I should have explained it better.

HU coded to hi-fi, so it is low level balanced output going to MS8.

Now
Ch1: FL
Ch2: FR
Ch3: FL (for underseat subs)
Ch4: FR (for underseat subs)

Ch1 and Ch3 are having same input from front L mid.
Ch2 and Ch4 are having same input from front R mid.

Ch3 and 4 are not having input from the under seat subs.

So infact MS8 is having 4 channels input but front 2 are repeated for L&R.

Considering this, what do you suggest now?
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      09-03-2012, 07:03 AM   #7
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Ch1: FL
Ch2: FR
Ch3: RL
Ch4: RR

This is how you need to connect the inputs. Why would you not use the rear HU outputs to begin with if that's where the PDC signal is at?
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      09-03-2012, 07:56 AM   #8
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Quote:
Originally Posted by Technic View Post
MS-8 (held by velcro):


Notes:

- This E90 has Park Distance Control and the "beeps" are only generated by the rear OEM outputs. In a regular HiFi integration the MS-8 only uses the front OEM outputs while skipping the MS-8 input setup. To retain the PDC sounds without adding more cost/additional speakers to the system all 4 OEM outputs are combined using "2-female to 1-male" RCA cables -Left Front combined to the Left Rear and so on- into two output channels and then input into the MS-8. This way the MS-8 Input setup can still be skipped and the PDC sound will be retained but thru all the speakers intead of rear speakers alone, while no loss of OEM signal quality and strength.

Quote:
Originally Posted by makkan00 View Post
Hi Guys,
Installed MS-8 and setup:
input all 4 channels to MS-8 this way
Ch1: FL
Ch2: FR
Ch3: FL (for underseat subs)
Ch4: FR (for underseat subs)
Ch5: RL
Ch6: RL

and output:
Ch1: to amp and to FL
Ch2: to amp and to FR
Ch3: to amp and FL sub
Ch4: to amp and FR sub
Ch5: to amp and RL
Ch6: to amp and RR
Ch7: to centre



I have also coded HU to hi-fi.
PDC gongs were there and now nill.
Is MS8 summing input signals?

I wonder if CH3 and CH4 (in input setup) are culprits?
Hi-fi coding
MS8 L7 processing

Has anybody had issues like this?
Any suggestions or solution?


Thanks.
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      09-03-2012, 01:31 PM   #9
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Quote:
Originally Posted by kaigoss69 View Post
Ch1: FL
Ch2: FR
Ch3: RL
Ch4: RR

This is how you need to connect the inputs. Why would you not use the rear HU outputs to begin with if that's where the PDC signal is at?

I think you have not read my first post. It clearly says that Ch5 and Ch6 are from rears.


I guess what Techinc suggested make sense.

I am off to search now RCA convertors.
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      09-03-2012, 01:36 PM   #10
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Quote:
Originally Posted by Technic View Post
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Thanks Technic, you are saviour.

I have used hi-signals input to MS8 (through speakers wires) and have not used RCA connector.

Buying RCA connector and getting it delivered will take 1-2 weeks and this car belongs to my friend who wants it asap.

Wondering, is it advisable to connect by combining wirings of Front Right and Rear right channel & Front Left and Rear left as an high level input in to MS8?

Or will I be risking my HU in this case?

Thanks.
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      09-03-2012, 03:52 PM   #11
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T,

I'm no electrician/electronic guru but I have always heard/read that you should never combine the front & rear outputs of a head unit in such a way because it reduces the output impedance and makes the deck shutdown and/or overheat. Is the BMW deck built differently than a normal HU? - Just want to make sure this can be dome safely.

OP,

your original post was a bit confusing but I see what you mean now. When you put "(for underseats)" it was a bit misleading. It seems you think/thought that the inputs and outputs need to somehow be matched, that is not the case! All you need is enough connections for a full range input. Since HiFi output is full range, you just need the front or rears, or both, if you allow MS-8 to sum them that way. But then, PDC sounds will come through both front and rear speakers! (with L7 on it will sound as if coming from the front and can be misleading...). If you want to retain true rear PDC, then you have the option of leaving the HU rear outputs connected to the OEM amp, and one pair of the rear speakers connected to the OEM amp, and by fading the HU to the front, PDC sounds will still come to the rear speakers while everything else enters MS-8 through the front HU outputs. Of course, you lose one set of rear speakers but that is no problem, as long as the set that is connected to the MS-8 has tweeters.
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      09-03-2012, 04:41 PM   #12
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Quote:
Originally Posted by kaigoss69 View Post
T,

I'm no electrician/electronic guru but I have always heard/read that you should never combine the front & rear outputs of a head unit in such a way because it reduces the output impedance and makes the deck shutdown and/or overheat. Is the BMW deck built differently than a normal HU? - Just want to make sure this can be dome safely.
The combined outputs in this particular case are low level (HiFi). Otherwise, you are correct.
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