[Snoopy Singh]

Hey folks, I am looking for some clarity regarding $676 Hifi coding.

My headunit is a 2011 CIC Pro Nav with CIC.C1A firmware. Originally my car had the base stereo. I was curious about getting the cleanest possible signal from the headunit to begin my audio install so I took some measurements.

When coded to stereo, Using a 1Khz testone at max volume I measured around 9 to 10 volts (AC) at the Front left speaker output from the headunit.

Coded to Hifi, now I know the coding flattened the eq becasue the difference in sound is very obvious. So same again with the 1Khz test tone at max volume and measured at the Front left speaker output and it was still 9 to 10 volts.

So although my eq curve is now flat, the output is still high level.

Is Low level output only possible on some headunits and not others or am I not doing something right.

If anyone can offer some advice or if they have also come across similar issue's, I would love to hear your thoughts.

Thanks

[ctuna]

Look at entry 59 in this thread .


http://www.e90post.com/forums/showth...=recode&page=3


Also the thread is pretty informative about this subject.

http://www.e90post.com/forums/showthread.php?t=802793

On a 2011 you need and icom cable to do this I have been
told by makkan00 see next link.

http://www.e90post.com/forums/showthread.php?t=704363

Also the coding is not so simple with idrive there are a bunch of modules to change.

The hidden menu in the idrive should be able to display
the status as indicated by the first link

http://www.e90post.com/forums/attach...2&d=1260829447

[Snoopy Singh]

Thanks for your response. The links you posted mostly refer to the headunits without Idrive. Only hidden menu on my CIC is the service option that appears under settings after doing the controller sequence and there's nothing to do with audio output status there.

I was aware that the coding with Idrive was not so simple as there are a bunch of modules to apply the changes too. (CAPPL/CTUNE/CGATE/CAUDI) are these the modules you are reffering too?, but again this applies to the old CCC headunits.

Although my CIC is a 2011 unit, I have coded successfully various different features within its .TRC file using a K+D Can cable. Do you think I still need an Icom cable to code to hifi?

Thanks

[ctuna]

Talk to Makkan00 he is the expert on this.
I think the number of clicks on the volume dial is and
indirect indicator. As displayed in that first link.
I have coded some simple stuff on my car but I have an
06 so Kcan cable works . Makkan00 indicated that around
09 you needed a icom cable to make changes and he does
this stuff to make money.
I know some people in the US have had to go to Bimmertech
to get this done and they send you and icoma cable.

There should be a way to verify Hi Fi through the hidden menu
I just don't know what it is for a idrive.

There is also and idrive sub forum here maybe they could help.
http://www.e90post.com/forums/forumdisplay.php?f=122

I would think the output would really drop if the change
had really worked .
I am also wondering if you measure across the outputs and its a differential signal would -5 and + 5 add up to 10
on a meter.

[bmw325i]

Did you try adding $676 to the VO and resetting those modules? I think it might only work on earlier builds that used kcan.

If I remember corectly vpelectricity said the voltage on the hifi headunit isnt linear and the signal is clipped at max volume.

[Snoopy Singh]

Thanks for your replies guys.

I am also wondering if you measure across the outputs and its a differential signal would -5 and + 5 add up to 10

I never thought about it this way, I will do a bit of research to see if I can confirmn the above.

Also, using NCS to check through various .TRC files all show Hifi in the relavent places. I also used DIS to check CIC system parameters and diagnosis requests. When I click on display results It says Audio system - Hifi. There is also a volume level numeric value in dis that increases/decreases with the volume knob in real time and I have found that with my particular headunit the volume maxes out at 64 clicks.

Using a 1Khz test tone and oscilloscope on the front left headunit output, I found that the signal wave starts to clip/distort after 62 clicks out of 64. So 61 clicks is my max unclipped output. I also checked this with a 100Hz test tone as well as a 50Hz test tone and got the same results, clipping after 61 clicks. This is another reason I'm convinced that the eq has been flattened because the signal is distorting at the same level throughout the frequency range.

[ctuna]

What kind of aftermarket amp are going to put on it?

[Snoopy Singh]

I have an audison bitone.1 that I would like to send the signal into first. I realise that this can accept high level in and de eq the signal, thats the way I'm running it now, but like any car audio enthusiast will tell you, The signal source is the most important thing. Always start with the cleanest possible signal, hence the reason I'm trying to get the headunit to run in hifi mode.

[taibanl]

Originally Posted by Snoopy Singh

I have an audison bitone.1 that I would like to send the signal into first. I realise that this can accept high level in and de eq the signal, thats the way I'm running it now, but like any car audio enthusiast will tell you, The signal source is the most important thing. Always start with the cleanest possible signal, hence the reason I'm trying to get the headunit to run in hifi mode.

From personal experience you may actually find a better s/n ratio at high level.

[Snoopy Singh]

From personal experience you may actually find a better s/n ratio at high level.

Thanks for your advice, I will give a try and see how I get on

Cheers

[torqueisking]

Originally Posted by Snoopy Singh

Coded to Hifi, now I know the coding flattened the eq becasue the difference in sound is very obvious. So same again with the 1Khz test tone at max volume and measured at the Front left speaker output and it was still 9 to 10 volts.

So although my eq curve is now flat, the output is still high level.

Old post but just an FYI for all, my E90 HiFi coded front channel radio output didn't measure flat.

[ctuna]

This post from ages ago is what some others got for charts

https://www.e90post.com/forums/showt...ighlight=graph

More flat than before as they were trying to get rid of the high end peak.

Should only be a +/- 5 volt signal if done correctly . (or if it took)
You do not list voltage. This should be measured at the output of the Radio not the Speaker.
Output of the speaker will be effected or is an amp signal.

I would read your Radio or Idrive files to see if it took.
If you have pro radio the first few lines should look like this

CODIERUNG_ERFOLGT
codierung_erfolgt
CDC
nicht_aktiv
AUDIO_SYSTEM
pl2_hifi
pl3_hifi
SDARS
nicht_aktiv
PDC
nicht_aktiv
ACC
nicht_aktiv
STANDHEIZUNG
nicht_aktiv

Audio system is line indicating Hi Fi there should be something
similar in an Idrive File.

[torqueisking]

Originally Posted by ctuna

This post from ages ago is what some others got for charts

https://www.e90post.com/forums/showt...ighlight=graph

More flat than before as they were trying to get rid of the high end peak.

Should only be a +/- 5 volt signal if done correctly . (or if it took)
You do not list voltage. This should be measured at the output of the Radio not the Speaker.
Output of the speaker will be effected or is an amp signal.

That thread shows Base radio measurements. OP, and my post, are referring to the Hifi radio/coding. They are not the same.

My measurement is in dBV. Yes, as I said in my post, my E90 HiFi coded front channel radio output didn't measure flat.

[ctuna]

I thought they had after coding graphs in there to.