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      09-02-2016, 01:25 AM   #89
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Yes! Indeed!

Quote:
Originally Posted by Grentz View Post
Just did the fix. Definitely an improvement. Frankly i think it fixed the phasing of the front speakers in general as well. The soundstage is much improved.
Wow! I just did a critical listening test with some major bass tracks. With my JL Audio amp in place, the factory hifi speakers are really getting a workout, especially the underseat woofers. And my personal theory about including rather than excluding the center speaker finally makes sense.

I think if folks want a basic upgrade, an amp, plus the ASD harness is perfect project without swapping out the tweeterless crummy full range hifi speakers.
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      09-02-2016, 12:17 PM   #90
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Quote:
Originally Posted by fancyfl1ght View Post
Wow! I just did a critical listening test with some major bass tracks. With my JL Audio amp in place, the factory hifi speakers are really getting a workout, especially the underseat woofers. And my personal theory about including rather than excluding the center speaker finally makes sense.
Are you saying that the harness fix also fixes the "smearing" of the center channel somehow?

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      09-02-2016, 12:31 PM   #91
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Yes

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Originally Posted by DBinOC View Post
Are you saying that the harness fix also fixes the "smearing" of the center channel somehow?

DBinOC
I can clearly hear the center channel as a distinct speaker. It really makes the front audio sound stage really wide and loud. Case in point. I had to turn down the gong volume!

Now, I do have an aftermarket amp feeding the crummy tweeterless hifi speakers so, that may be factor as well. I used Technic's suggestion to bridge (2) 75 watt amplifer channels from my 8 channel amp using a High Pass filter set at 250Hz for the center channel. That's about 200W RMS going to a single channel, but at 250 Hz, there no bass. I may very well replace the center channel with a 3" or 3.5" aftermarket coax speaker.

But the center channel presence is really clear and distinct.

Regards,
fancyfl1ght
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Last edited by fancyfl1ght; 09-02-2016 at 12:45 PM..
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      09-02-2016, 03:04 PM   #92
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Cool. The center channel is certainly easy enough to connect and disconnect. I'm still running stock HK everything, so I'll give it a shot and see what I prefer once I get the harness fixed.

Thanks again,

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      09-03-2016, 03:04 PM   #93
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Quote:
Originally Posted by Silver6spd View Post
I recently found a fix to the loss of bass that is inherent to the bypass harness and sent my findings off to Technic for verification, below is the response I have received from Technic.

(Your findings made me contact BMWAG to confirm the ASD OEM schematic and they confirmed your conclusion: the OEM schematic is incorrect for the HiFi (676) and the Top HiFi (674) systems.

Pins #3 and #4 (white and white/black wires in the ASD bypass harness) are incorrectly labeled in the schematics. Correct polarities are Pin # 3 negative and Pin #4 positive. The schematic showed them backwards.)

So Technic was unaware that the bypass harness was wired from a faulty BMW schematic which in turn created an out of phase front speaker, luckily the fix is simple and should be very easy for harness owners to perform themselves.

Fix:
Cut (white and white/black) wires at the midpoint of the wires loop and then re-connect the two wires so that you get a (white to white/black pair of wires) (cross the streams!) You should now have a (Front left) speaker with the proper polarity, in phase, and more importantly restoring the bass.

Technic wanted me to mention that the bypass harness is now corrected and that if any current owner is uncomfortable with performing the above fix they can have their harness rectified by contacting him directly.

Here is the fix without cutting anything. Here is the wiring harness before any modifications. Note the blk/wht wire is next to the red wire.


Get your jewelry screwdriver set and use the smallest screwdriver to push the tab on the pin connected to the wire and pull out the wire from the other side.



Here is the wire and pin showing you the tab that you have to push in to release the wire.



Switch the two wires and push them back in the plug case. Note that the white wire goes next to the red wire now.



On my wiring harness the tabs were on opposite sides of the pin for each wire. So, if you push the screwdriver in to release the tab and the wire does not easily pull out, try inserting the screwdriver on the other side of the pin.

Last edited by mdputnam; 09-03-2016 at 03:50 PM.. Reason: Added tab on opposite sides
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      09-03-2016, 04:48 PM   #94
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mdputnam wished I had seen that last night before I did a cut and splice

I did do the fix with a cut and splice and it's a definite improvement.
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      09-03-2016, 05:50 PM   #95
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Quote:
Originally Posted by mdputnam View Post
Here is the fix without cutting anything. Here is the wiring harness before any modifications. Note the blk/wht wire is next to the red wire.


Get your jewelry screwdriver set and use the smallest screwdriver to push the tab on the pin connected to the wire and pull out the wire from the other side.



Here is the wire and pin showing you the tab that you have to push in to release the wire.



Switch the two wires and push them back in the plug case. Note that the white wire goes next to the red wire now.



On my wiring harness the tabs were on opposite sides of the pin for each wire. So, if you push the screwdriver in to release the tab and the wire does not easily pull out, try inserting the screwdriver on the other side of the pin.
GREAT! That's the approach I was hoping to see...
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      09-06-2016, 10:08 AM   #96
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Quote:
Originally Posted by JohnnyCanuck View Post
mdputnam wished I had seen that last night before I did a cut and splice .
Quote:
Originally Posted by GoSlow2GoFast View Post
GREAT! That's the approach I was hoping to see...
Glad to be of help for some..
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      09-12-2016, 07:32 PM   #97
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Big Difference

Quote:
Originally Posted by Silver6spd View Post
I recently found a fix to the loss of bass that is inherent to the bypass harness and sent my findings off to Technic for verification, below is the response I have received from Technic.

(Your findings made me contact BMWAG to confirm the ASD OEM schematic and they confirmed your conclusion: the OEM schematic is incorrect for the HiFi (676) and the Top HiFi (674) systems.

Pins #3 and #4 (white and white/black wires in the ASD bypass harness) are incorrectly labeled in the schematics. Correct polarities are Pin # 3 negative and Pin #4 positive. The schematic showed them backwards.)

So Technic was unaware that the bypass harness was wired from a faulty BMW schematic which in turn created an out of phase front speaker, luckily the fix is simple and should be very easy for harness owners to perform themselves.

Fix:
Cut (white and white/black) wires at the midpoint of the wires loop and then re-connect the two wires so that you get a (white to white/black pair of wires) (cross the streams!) You should now have a (Front left) speaker with the proper polarity, in phase, and more importantly restoring the bass.

Technic wanted me to mention that the bypass harness is now corrected and that if any current owner is uncomfortable with performing the above fix they can have their harness rectified by contacting him directly.

I swapped the wires today and what a huge difference. The system sounds incredible now. I used a paper clip to unplug the connectors and I had to fight with it a little. Thanks to Silver6spd for tracking this down and mdputnam for the pictures.
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      09-14-2016, 08:33 PM   #98
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So perhaps I'm still missing something. TechnicPnP previously told orangeglim that the ASD unit functioned as a 15W amp (approx 8V), boosting the low 2.8V input signal from the iDrive, and that removing this 15W boost from the signal path was the reason for the missing bass.

But then Silver6spd is told by TechnicPnP that the BMW schematic used to design the harness was incorrect, and that with a simple fix, everything works as intended, with no loss of bass.

Are we now saying that the rewired bypass harness somehow retains the boost of the ASD amp without sending the ASD engine sound into the signal path? I'm hopeful, but just want to know what I'm getting into before I order the new harness.
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      09-14-2016, 09:10 PM   #99
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After I initially installed the harness I contacted Technic whose response you see posted above. I then removed the harness and used everything in a stock form. Once the news broke of the harness mod that fixes the bass response I did the mod and reinstalled the harness. The bass response is fixed. So, I assume the 15W AMP loss from the missing ASD module isn't as significant as the out-of-phase issue with the harness wiring. I'd say order a harness and enjoy.
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      09-16-2016, 03:36 PM   #100
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Quote:
Originally Posted by CAVU View Post
So perhaps I'm still missing something. TechnicPnP previously told orangeglim that the ASD unit functioned as a 15W amp (approx 8V), boosting the low 2.8V input signal from the iDrive, and that removing this 15W boost from the signal path was the reason for the missing bass.

But then Silver6spd is told by TechnicPnP that the BMW schematic used to design the harness was incorrect, and that with a simple fix, everything works as intended, with no loss of bass.

Are we now saying that the rewired bypass harness somehow retains the boost of the ASD amp without sending the ASD engine sound into the signal path? I'm hopeful, but just want to know what I'm getting into before I order the new harness.
Saw your post on the M2 forum as well ...

I think it's a combination of both. The out-of-phase condition that the original wiring in the harness created in the subs had a far larger effect than any lost line-level input voltage that taking ASD out of the signal path creates. And honestly, that amount of power (15W) is nowhere near enough to make a tremendous difference in bass frequency SPL. It would be manifested far more in the higher audible registers than in bass.
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      09-16-2016, 04:59 PM   #101
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Quote:
Originally Posted by orangeglim View Post
After I initially installed the harness I contacted Technic whose response you see posted above. I then removed the harness and used everything in a stock form. Once the news broke of the harness mod that fixes the bass response I did the mod and reinstalled the harness. The bass response is fixed. So, I assume the 15W AMP loss from the missing ASD module isn't as significant as the out-of-phase issue with the harness wiring. I'd say order a harness and enjoy.
Quote:
Originally Posted by Viffermike View Post
Saw your post on the M2 forum as well ...

I think it's a combination of both. The out-of-phase condition that the original wiring in the harness created in the subs had a far larger effect than any lost line-level input voltage that taking ASD out of the signal path creates. And honestly, that amount of power (15W) is nowhere near enough to make a tremendous difference in bass frequency SPL. It would be manifested far more in the higher audible registers than in bass.
Thanks guys. I harness is now on the way.
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      09-16-2016, 08:52 PM   #102
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Quote:
Originally Posted by ed.k View Post
I swapped the wires today and what a huge difference. The system sounds incredible now. I used a paper clip to unplug the connectors and I had to fight with it a little. Thanks to Silver6spd for tracking this down and mdputnam for the pictures.
I too used a paper clip - my smallest jeweler's screwdriver was too big, diameter-wise.

A tip: for each pin you are trying to remove, there is a small hole on either side. If you don't have any luck trying to release the tiny clip using the hole on one side of the pin, try using the one on the other side. In my case, the hole I "probed" to release the clip for the black/white wire was on a different side than the hole which worked for releasing the white wire. I think it all has to do with how the pin was inserted into the connector, i.e., which way the clip was facing. -scr
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      09-17-2016, 12:33 PM   #103
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Quote:
Originally Posted by SoCalRob View Post
I too used a paper clip - my smallest jeweler's screwdriver was too big, diameter-wise.

A tip: for each pin you are trying to remove, there is a small hole on either side. If you don't have any luck trying to release the tiny clip using the hole on one side of the pin, try using the one on the other side. In my case, the hole I "probed" to release the clip for the black/white wire was on a different side than the hole which worked for releasing the white wire. I think it all has to do with how the pin was inserted into the connector, i.e., which way the clip was facing. -scr
Took me 30 minutes total to pull everything apart, make the pin swap and put back together. Elias from TechnicPMP offered to send me a free extractor but I declined since it was so straightforward. Outstanding service and he stands by his product. He also sent me this diagram.
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      09-17-2016, 05:04 PM   #104
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I used the smallest micro screwdriver in my set, and it worked. Swapped the wires, and the sound on my hifi system is markedly better. Thanks to Silver6spd and mdputnam !
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      09-22-2016, 07:17 PM   #105
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I just got and installed the harness. Unfortunately the bass loss from the driver's seat sub is noticeable. Assume this is what I have to live with to remove ASD?

Last edited by GrayM235; 09-22-2016 at 07:48 PM..
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      09-22-2016, 07:49 PM   #106
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Quote:
Originally Posted by GrayM235 View Post
I just got and installed the harness. Unfortunately the bass loss is noticeable. Assume this is what I have to live with to remove ASD?
No, you should reread this thread for the simple fix to correct the issue. Or see the Dr. Strangelove thread: http://www.2addicts.com/forums/showthread.php?t=1236238.
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      09-22-2016, 07:57 PM   #107
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Quote:
Originally Posted by selmeralto View Post
No, you should reread this thread for the simple fix to correct the issue. Or see the Dr. Strangelove thread: http://www.2addicts.com/forums/showthread.php?t=1236238.
Thanks. Unfortunately I did not inspect the wiring carefully to confirm but I assumed technicpnp sent the latest 'fixed' harness? I just got it this week.

Are you getting the same amount of bass from both sides? I can actually feel the bass thump on passenger seat vs none on driver's side.
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      09-22-2016, 08:00 PM   #108
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Quote:
Originally Posted by GrayM235 View Post
Thanks. Unfortunately I did not inspect the wiring carefully to confirm but I assumed technicpnp sent the latest 'fixed' harness? I just got it this week.

Are you getting the same amount of bass from both sides? I can actually feel the bass thump on passenger seat vs none on driver's side.
I suggest you write directly to Technic to find out whether you've gotten the corrected version. He has been very straightforward and helpful regarding this issue. That would be the most reliable way of determining your next step.
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      09-22-2016, 08:03 PM   #109
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Thanks, I have and am waiting on his response. I just wanted to get feedback from others who installed the 'fix' as well. Sanity check of sorts
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      09-22-2016, 08:33 PM   #110
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Quote:
Originally Posted by GrayM235 View Post
Thanks, I have and am waiting on his response. I just wanted to get feedback from others who installed the 'fix' as well. Sanity check of sorts
I feel your pain. One thing you can do if you don't mind the possibility of having an unneeded splice in a hidden area is just switch the wires and see if you can hear a difference. You can't do any harm and it might set your mind at ease.
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