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      04-24-2016, 03:34 PM   #1
Kantalias
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Active Sound Design (ASD) topics

I just used the TechnicPNP harness to bypass active sound design (ASD) in my M2. Install went exactly as described in the thread.

The difference is remarkable. I wish I had been more scientific and taken before and after SPL measurements; I think it's gotta be 6 dB at 70 MPH.

For those of you concerned about the cabin noise or irritated by the artificial sound you should do this mod. This is the absolute best modification I've made to a car ever. Thank you Technic !

This car sounds great and the ASD detracts from that. Of course there's more noticeable road noise with the ASD bypassed, but that's obviously a separate matter. I suspect BMW cranked up the ASD to cover for the missing sound deadening. But the effect is overwhelming IMHO and I'm absolutely glad it's gone!
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      04-24-2016, 07:37 PM   #2
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Thanks for posting, I am going to definitely do this mod. From the videos I have seen it appears pretty intrusive when you go into sport or sport plus modes. It will be nice to just have the natural sounds in the cabin.
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      04-25-2016, 02:44 AM   #3
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Buddy, can you please do some recording for us as we would be interested to hear the difference.
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      04-25-2016, 06:48 AM   #4
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Please make a comparison video between with and without ASD. That would be greatly appreciated.

Another point is the question if you really need this option. What if we just code it out or pull the grey ASD plug from the HK amplifier? Either option is a lot cheaper than paying for this cable and it does the same thing.

MR
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      04-25-2016, 07:18 AM   #5
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Quote:
Originally Posted by MR. View Post
Please make a comparison video between with and without ASD. That would be greatly appreciated.

Another point is the question if you really need this option. What if we just code it out or pull the grey ASD plug from the HK amplifier? Either option is a lot cheaper than paying for this cable and it does the same thing.

MR
From what I understand, it is possible to code it out, but as the ASD is still plugged in, it introduces a high pitched white noise into the cabin that many people hear and find annoying.

Unplugging ASD from the HK amp will cause you to lose the entire sound system, as there is no separate amp.

I think this is the exact same behaviour for M235, since ASD and the sound system are identical to the M2. I don't have the links to those posts handy, but I'm sure someone will chime in with them.

EDIT - found the thread I referenced before:

http://f87.bimmerpost.com/forums/sho....php?t=1249773

Last edited by Ex-MINI; 04-25-2016 at 11:42 AM..
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      04-25-2016, 09:49 PM   #6
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Sorry, I love you guys, but I'm not gonna tear my trunk apart again for comparative analysis. I wish I had borrowed a friend's SPL meter and done a before and after for a more scientific review but that's the way the cookie crumbles. I'm just glad the ridiculous booming is gone and I can hear my own thoughts while driving this great car!
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      04-25-2016, 09:54 PM   #7
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Can someone confirm that this does not also disable the electronic flap for the exhaust. Obviously that would be a very undesirable side effect. BTW I ordered one today
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      04-26-2016, 08:35 PM   #8
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Not sure why it would affect the exaust, but I can confirm it does not. Same, sick cold start sounds!
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      04-26-2016, 08:46 PM   #9
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Only reason I asked is that the comfort and sport setting which affects the ASD also affects the exhaust flap. I didn't know if they were tied together in some way. Anyhow, good to hear that they are indeed separate. My bypass harness is on order.
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      04-26-2016, 10:14 PM   #10
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Got it. The link in my original post has a detailed 2er installation walk-through. Another member struggled with the connector keying, I think maybe they forgot to swap the housings. The guide covers all this. I used a spare hole in the main amp's mounts as a mount-point for the original cables tie-down then cable tied the new harness to the mount-point I removed the original cable from on the ASD module. It was easy to do a clean install.

There's almost zero sound deadening in the trunk...made me wish I had a roll of dynamat on hand. There was a big slather of glue on the driver's wheel well in my car; someone must have been preparing to do an M235i sound dampening install when they realized it was an M2.
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      05-02-2016, 09:59 PM   #11
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Installed mine tonight. One less item on my to-do list.
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      05-03-2016, 07:56 AM   #12
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Quote:
Originally Posted by Pyrat 2 View Post
Installed mine tonight. One less item on my to-do list.
Nice! What do you think of the ASD-free sound?
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      05-03-2016, 09:17 AM   #13
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The real deal is much better than the artificial stuff.
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      05-19-2016, 11:56 PM   #14
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Would it be reasonable to remove a fuse to hear the car without asd prior to coding it out or bypass? Apparently fuse 122 disables the radio and asd.
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      05-20-2016, 09:55 PM   #15
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Quote:
Originally Posted by mfritz View Post
Would it be reasonable to remove a fuse to hear the car without asd prior to coding it out or bypass? Apparently fuse 122 disables the radio and asd.
If you want...but it's a night and day difference that you'll absolutely love. Especially at highway speeds -- you can talk to someone in a normal voice at 100 MPH, no can do with ASD enabled!

The fuse does take the stereo with the ASD. You can also just unplug the ASD module (which also disables all audio).
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      05-21-2016, 05:56 PM   #16
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Do you think there is any difference in comfort mode without ASD?
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      05-21-2016, 09:46 PM   #17
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Quote:
Originally Posted by mfritz View Post
Do you think there is any difference in comfort mode without ASD?
Without ASD the sound level does not change when switching modes.

In comfort mode, comparing ASD to non-ASD, I estimate the cabin is 6 dB quieter with ASD disabled. Just do it!
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      05-21-2016, 10:03 PM   #18
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Quote:
Originally Posted by Kantalias
Quote:
Originally Posted by mfritz View Post
Do you think there is any difference in comfort mode without ASD?
Without ASD the sound level does not change when switching modes.

In comfort mode, comparing ASD to non-ASD, I estimate the cabin is 6 dB quieter with ASD disabled. Just do it!
Agree.
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      05-22-2016, 12:17 AM   #19
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Thanks. I plan to disable Asd ASAP.
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      05-22-2016, 11:59 AM   #20
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Guys, I want to film it someone when I have time, but I do not know how to do it. If I come up with an option to find a decent comparison I will make one. First need to order that cable and install it.

MR
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      05-22-2016, 12:54 PM   #21
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Quote:
Originally Posted by Kantalias View Post
you can talk to someone in a normal voice at 100 MPH, no can do with ASD enabled!
That is broken! F BMW for doing that.
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      05-31-2016, 09:28 PM   #22
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Does the ASD amplify the engine noise even at idle? Have noticed the engine is noisy in the cabin, in a bad rattly type of way.
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