Planet 9

**His987CS** · #1 06-15-2009, 05:36 AM

Yesterday I was treating the leather in my CS. I was sitting on a stool next to the driver's door and I heard a high frequency hiss. I determined the noise to be coming from the mid-range speaker on the door. The radio was off and the key was not in the ignition. I checked the passenger’s side but did not hear anything. I then checked Her987CS's CS and heard exactly the same thing on the driver's side and again nothing on the passenger’s side.

Has anyone else noticed this, and does anyone know what could be causing it?

Mark

Gator Bite · #2 06-15-2009, 07:12 AM

Originally Posted by His987CS

Yesterday I was treating the leather in my CS. I was sitting on a stool next to the driver's door and I heard a high frequency hiss. I determined the noise to be coming from the mid-range speaker on the door. The radio was off and the key was not in the ignition. I checked the passenger’s side but did not hear anything. I then checked Her987CS's CS and heard exactly the same thing on the driver's side and again nothing on the passenger’s side.

Has anyone else noticed this, and does anyone know what could be causing it?

Mark

Could be a phone interface. Do you have the Bluetooth kits installed? They use the amplifer and the speakers on one side (programmable). This wake up of the amplifier could result in a little noise floor (hiss).

Check the TP button and the programming of your radio.

**His987CS** · #3 06-15-2009, 09:03 AM

Originally Posted by Gator Bite

Could be a phone interface. Do you have the Bluetooth kits installed? They use the amplifer and the speakers on one side (programmable). This wake up of the amplifier could result in a little noise floor (hiss).

Check the TP button and the programming of your radio.

Gator, thanks for the quick reply,

No Bluetooth in either car. I initially thought it might have something to do with the 9500ci install I just completed, but when I also heard the same static comming from my wife's car (her car is totally stock with the same options as mine except I also have PASM) I figured it had to be something from the factory. I suspect if you listen to yours you might hear it also.

Mark

greycroc · #4 06-15-2009, 09:43 AM

Originally Posted by His987CS

The radio was off and the key was not in the ignition.
Mark

Just FYI the radio can be on with out the key in the ignition. Also cigarette lighter has power to it all the time.

**His987CS** · #5 06-15-2009, 10:08 AM

Originally Posted by greycroc

Just FYI the radio can be on with out the key in the ignition. Also cigarette lighter has power to it all the time.

I was aware of this, and my first thought was that I had left it ON but turned way down, however, upon checking, it was in fact OFF.

The mystery persist

Mark

**Blitzkrieg** · #6 06-15-2009, 10:18 AM

Do you have any aftermarket electronics in your car? stereo, radar or otherwise?

Initially when I had my SRX installed the speaker was mounted behind the center console too close to the main power line that runs from the battery down the center of the car, The speaker was picking up feedback and broadcasting an annoying high pitched wine, it's pitch would change with RPM. Moving it a few inches away fixed the issue.

In past cars I've had the same sound due to a bad electrical ground, I believe its called a "ground loop", though never heard of these issues in our cars.

Best of luck with troubleshooting the noise.

saucerman · #7 06-15-2009, 11:38 AM

this happens to me if I have my cell phone on me...

beez · #8 06-15-2009, 12:05 PM

I believe this might have something to do with cell phone signals passing through unshielded wiring in some electronics... did you have your phone on you? Often, if I have my cell phone on a night stand next to a bed while staying in a hotel, I hear intermittent buzzing from the clock radio, even though it's off. In my 996 turbo, I at first put my cell phone in the small cubby-hole under the radio and A/c controls - like the empty spot we have in the Cayman, and got all kinds of interference - when removed, the audio system worked fine - in fact, when I was keeping it there, you actually got advanced warning of a call coming in - the audio system would explode with loud interference, and then the phone would ring a few seconds later. In the newer cars (997/987) they seem to have shielded the wiring better - I keep my phone down there now, and there's no noise.

brad

timbucthree · #9 06-15-2009, 12:28 PM

You should note that there is a delay in your radio turning off completely. When you remove the key and exit the vehicle, the radio receiver electronics will turn off immediately, it will however not completely turn off and will keep the external amplifier powered. The radio itself does not go to sleep immediately. It stays in a standby state for about 5 minutes, with the external amplifier powered on. This will result in some noise coming from the speakers. The noise is at a very low level and difficult to hear unless you are looking for it. I have noticed this if you leave the radio ON button, ON all the time and rely on the removal of the key to turn off the radio. If this is the case, you will find that the external amplifier turns on as soon as you open the drivers side door and you will hear the amplifier noise as well. This external amplifier enablement functionality is controled by pin 5 in the "A" ISO connector on the CDR24.

timbucthree

**His987CS** · #10 06-15-2009, 04:15 PM

Originally Posted by timbucthree

You should note that there is a delay in your radio turning off completely. When you remove the key and exit the vehicle, the radio receiver electronics will turn off immediately, it will however not completely turn off and will keep the external amplifier powered. The radio itself does not go to sleep immediately. It stays in a standby state for about 5 minutes, with the external amplifier powered on. This will result in some noise coming from the speakers. The noise is at a very low level and difficult to hear unless you are looking for it. I have noticed this if you leave the radio ON button, ON all the time and rely on the removal of the key to turn off the radio. If this is the case, you will find that the external amplifier turns on as soon as you open the drivers side door and you will hear the amplifier noise as well. This external amplifier enablement functionality is controled by pin 5 in the "A" ISO connector on the CDR24.

timbucthree

Thanks for this, very informative.

I normally keep the radio off and so I do not think that this is what is occurring. But just to be sure, tonight when I get home I will open the driver’s door, ensure that the radio does not come on, and check for the noise again.

The other issue is that I am only hearing it out of the driver’s side. There is no noise coming out of the passenger’s side. I would assume that if the amp is up and active I would hear noise floor levels out of both sides (the speaker balance is centered).

Also no cell phones anywhere around the car.

Mark

**Santa Fe** · #11 06-15-2009, 05:18 PM

Very interesting. Mark I can assure that in time your ears will not hear that faint noise (I just tried various scenarios described above and heard nothing but it would have to be pretty loud to compensate for ears subjected to the R&R habits of my youth)...it may require another 20 or 30 years but what the heck.

***Greywolf*** · #12 06-15-2009, 07:56 PM

I've noticed the same sound and theorized that part of the sound system is used to make the assorted chimes used for warnings both useful and others not so much. Seat belts, lights on, key in the ignition etc. Using the existing sound system would negate the need for separate noise makers. I've no proof one way or the other though.

**His987CS** · #13 06-16-2009, 05:28 AM

Originally Posted by Santa Fe

Very interesting. Mark I can assure that in time your ears will not hear that faint noise (I just tried various scenarios described above and heard nothing but it would have to be pretty loud to compensate for ears subjected to the R&R habits of my youth)...it may require another 20 or 30 years but what the heck.

I love this! Santa Fe you are right. I just need to be more patient and give it some time.

Originally Posted by Greywolf

I've noticed the same sound and theorized that part of the sound system is used to make the assorted chimes used for warnings both useful and others not so much. Seat belts, lights on, key in the ignition etc. Using the existing sound system would negate the need for separate noise makers. I've no proof one way or the other though.

This makes sense to me. I did another check yesterday and there is hiss coming out of the passenger’s side but at a much lower level. I suspect the warning/alarm system is tied into the sound system and so the speakers are always in a quiescent active state. The noise floor for the system does seem a bit high however. But I guess for a stock car audio system this is to be expected.

Mystery solved. Thanks everyone!

Mark

***Greywolf*** · #14 06-16-2009, 02:04 PM

Actually the real solution is for one of us to get ambititious enough to do more than armchair experiments to verify. Shouldn't be hard. An ear by the speaker and make it sound some warning. The key in ignition, lights on or similar should be easy. I've just always had something with more priority while in the CS.

**His987CS** · #15 06-17-2009, 05:53 AM

Originally Posted by Greywolf

Actually the real solution is for one of us to get ambititious enough to do more than armchair experiments to verify. Shouldn't be hard. An ear by the speaker and make it sound some warning. The key in ignition, lights on or similar should be easy. I've just always had something with more priority while in the CS.

Tried this this morning and the alarm chime seems to be coming from behind the instrument cluster. Nothing coming from the door speaker.

Mark

solrac6262 · #16 09-29-2009, 06:34 PM

hello guys,
anyone heard some air noise like buzzing coming out from the speaker(bose system)? I noticed this on the door speaker I went inside and I closed the door, after locking the car a few secods later the noise was gone.. but if I don't lock the car the noise is there..

solrac6262 · #17 09-29-2009, 07:16 PM

door locked with alarm- noise gone
door locked - noise
door unlocked - noise
both speakers

Professor MSP · #18 09-29-2009, 09:27 PM

Originally Posted by solrac6262

door locked with alarm- noise gone
door locked - noise
door unlocked - noise
both speakers

I have not noticed any sounds like you describe, but a little more information might help me reproduce the sound, as I have the Bose system.

Is the power on for the Bose when you hear the sound? If so, what is the volume, and does this occur while playing the radio or a CD?

solrac6262 · #19 09-29-2009, 09:35 PM

Originally Posted by Professor MSP

I have not noticed any sounds like you describe, but a little more information might help me reproduce the sound, as I have the Bose system.

Is the power on for the Bose when you hear the sound? If so, what is the volume, and does this occur while playing the radio or a CD?

ok on your door speakers the small ones.. if you open your door.. this is with the car shut off and the stereo off.. there is a sound,coming from the speaker, you need to put your head in the speaker and it sounds like when you are listening to the AM radio stations and you change stations and there is static sound.. thats the kind of sound I am getting like the bizzzzzzz sound
untill you lock the car is gone like some sort of fuse shuts down you hear the click and the sound also goes off

Professor MSP · #20 09-29-2009, 11:06 PM

Okay, I went out to my car and confirmed that the noise is present in it too, and just the way you describe it. It emanates from the smaller of the two speakers in the doors (and from no other speaker in the car), and is a little louder in the driver's door speaker. The buzz/hiss stops a few seconds after the alarm is engaged. When I disengage the alarm the buzz/hiss does not return until I open the door.

I suspect this is normal seeing as you and I have confirmed its presence. Maybe somebody that fully understands the electrical interaction between the Bose and the alarm system can explain why this occurs.

If you don't mind, would you read the thread I started in the electronics subsection, titled "TP and Popping Sound?" I am curious if your Bose makes the same occasional sound that mine does. I had only one reply and that fellow said his did not make the sound I have heard.