As promised -

The method I took this time was more rigorous, so it can be duplicated again exactly by someone with the same setup:
laptop - MacBook Pro c. Feb 2009
Software - Garageband for the audio sample, and iSpectrum for the graphs/data
microphone - blue snowflake USB mic. (pretty cool little mic)

I do have an audio sample, but the limit on size doesn't allow me to post.

As for the rest, each thumbnail is labeled.

The takeaway is that 1. yes, there is an anomaly 2. the level does increase slightly with RPM, but not by much. 3. we have some pretty quiet cars, other than at 10 kHz.

 

I am going to replicate punker's experiment - i have the same equipment.

 

Now if we could only get someone from Infiniti headquarters to understand how serious we are about this issue and send them the data you guys gathered, maybe they would get a fix for this.

 

Nice job. The first graph shows there is definitely a problem at 10kHz that shouldn't be there, and is loud enough to be noticeable when present. We need to figure out how to post a soundclip so that others, including Infiniti can hear what we are hearing, or at least test their hearing to see if they can hear at 10kHz.

 

Newbie here. Purchased a new G37xS during July. Recently hit 5K miles. On way to work suddenly heard what sounded like a draft coming through the window. Or so I thought. I then wondered if it was emanating from the top of windshield. I even mentioned this to my co-worker. THEN I saw this thread! Comes and goes. To me it sounds like an old tea kettle wit the water starting to boil.

 

My ECU noise has actually gotten louder. I hate the noise so much, I am currently trying to unload the car for a huge loss. It (and the lack of attention from infiniti) has ruined my Infiniti experience (whatever that was supposed to be). I cannot and will not recommend the purchase of an Infiniti to anyone ever.

 

Did you ever try to duplicate Punker's experiment? Was curious if you got the same results. The noise in my car was unbearable on Saturday, then completely gone today, so there still may be something very simple that is setting off the noise. We need to record the noise and send it to the CEO of Infiniti before anyone dumps their cars for this issue.

 

No, not yet, but still intend to - I am curious to see if I can replicate it. To me, it sounds higher than 10k, but we will see...

 

I downloaded a sound generator from the web and tried to match the ringing I had in my ears and it came out about 8500 -9000 or so, but it's so hard to tell by just experimenting that way. I'd be curious to know how your test pans out. The noise in mine yesterday was extremely loud. Does your every NOT make the noise?

 

My sentiments exactly! I hate to sound like a crybaby, but this has totally ruined the Infiniti brand for me. This was my first Infiniti purchase and will definitely be my last. All the positive attributes of this car don't outweigh me having to hear that noise every day. In my car the noise is not intermittent. I hear it every day, although I notice it more on certain days. Good luck getting rid of your car. I can't stand the thought of losing all that money so I guess I'm stuck!

 

yeah, they are actually selling pretty cheap on ebay - Journeys with sunroof no other packages are 27 to 31k used. average is a little above 29k. And frankly, not many people are biting. I'd lose like 4 grand.

 

okay, went and dropped 30 bucks on a spectrum analyzer for the iphone - it's a professional tool, and is a lot more convenient than luggin my laptop around. I can use it to tune car stereos and rooms in the future, I suppose. Guess I'll need to buy the pink noise generator for the iphone now as well lol. I'll give it a whirl tomorrow. I recorded the sound tonight with my laptop, garageband and an sm57 microphone, but I picked up a lot of other weird electrical noise - I think it was some sort of interference - but I could definitely hear the ecu noise come and go as per the RPMs - it was very noticeable on tape, despite the other interference.

 

Okay, using my new app, I recorded some great, very telling audio with great screenshots. These are going straight to infiniti. Will post pics later ( on iPhone)

 

Okay here are my audio tests. Both images are from car at rest, engine revved to 1200 rpm. Gain set to +20 db. You can clearly see the peak at 9,905/9,9115 hz The light-colored peak in one of the images is a reference tone at 11,000 hz. The lower frequency peaks are the engine and exhaust noise, with a peak at 183-194 hz.

My thoughts:

1. As per the other poster, there is CLEARLY a narrow-band audio anomaly at right around 10 k hz.

2. The anomaly is essentially a sine wave.

3. The anomaly is clearly **almost** as loud as the exhaust/engine rumble.

4. The anomaly is high enough in the frequency spectrum to appear much quieter than it actually is (as per the SPL readings) and may appear inconsequential to older individuals or those with hearing loss.

5. This is bull**** that I have to ride around listening to this GD noise.

6. I found that my gym bag, in the footwell of the passenger side of the car, significantly decreased the perceived (and possibly the actual) noise level.

 

Looks like you've duplicated the results of the earlier test and proven that those of us complaining are not crazy and that there's definitely an issue. Need to send these results to Carlos Ghosn - CEO of Nissan. He's definitely a car guy and will jump their technical department to get this fixed. A real soundclip would be the trick since they could analyze and reproduce your results. Any way to record the sound on your app?