Hum/hiss when audio off? (BRZ) - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

MysteryMachine · 02-12-2014, 10:52 PM

Hello everyone,

I have a buzz/hiss/hum coming from the speakers whenever the head unit is on (about half way through the splash screen it starts). Its not noticeable when actually driving. Its a constant so not tied to volume. Its not a big deal but I still want to troubleshoot if its normal since OEM Audio Plus told me it should be completely silent.

Can anyone comment if they have buzz/hiss? Especially those with aftermarket amp/speaker but stock head unit? I also notice its tied to the day/night setting of the nav display. In night, with the much darker UI, its just a slight hiss and not noticeable but when in day mode it has quite a buzz.

EDIT: I swapped back to stock temporarily just to test... exact same buzz/hiss except quieter (which makes sense since the amp is more powerful hence louder hiss/buzz). Crappy stock head units... grumble grumble

Chimera · 02-17-2014, 02:51 PM

I have the exact same thing in my frs when I upgraded the amp. Tried everything. I used a ground loop isolator, which quieted it to about the same as before amp upgrade.. About to do hu upgrade.. Hopefully this will solve permanently

sshole · 02-17-2014, 02:53 PM

I've had the same thing since day 1 of ownership. No idea how to make it go away, but it really doesn't bother me since most of my time in the car is at 70+ mph...

MysteryMachine · 02-17-2014, 05:44 PM

Quote:

Originally Posted by Chimera

I have the exact same thing in my frs when I upgraded the amp. Tried everything. I used a ground loop isolator, which quieted it to about the same as before amp upgrade.. About to do hu upgrade.. Hopefully this will solve permanently

Thanks much, Can you give some more details on your ground loop isolator?

Chimera · 02-18-2014, 09:19 AM

It's a.. Bad.. Fix, I did it to see if it would work, but I spliced mine directly into the input of the amp.. I'll take a photo later this week

labskaus · 02-19-2014, 02:51 AM

I have the same poblem ... I think the leyless system is resonsable for the dissortion

SirBrass · 02-19-2014, 03:19 AM

Haven't heard it yet. Driving a Limited, so it's keyless.

kludger · 02-20-2014, 12:02 AM

I have the same hiss on a BRZ limited with OEM Audio+ and similarly I only notice it when listening with loud volume while the car is stopped and the music is some acoustic music with quiet section.

Not a deal breaker for me since I don't notice it most of the time and the systems sounds awesome otherwise, but would be cool if there was a reasonable fix.

rdrdtheta · 12-12-2014, 01:42 AM

Did changing out the head unit solve any of the hissing issue?

Chimera · 12-13-2014, 08:58 AM

Quote:

Originally Posted by rdrdtheta

Did changing out the head unit solve any of the hissing issue?

Primary culprit for me was too much gain. I don't have this anymore, but I also replaced speakers, amp and hu.

02-12-2014, 10:52 PM	#1
MysteryMachine Senior Member Join Date: Oct 2013 Drives: 2014 SWP BRZ, 2002 Bugeye OBS Location: Austin Posts: 255 Thanks: 204 Thanked 121 Times in 85 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	Hum/hiss when audio off? (BRZ) Hello everyone, I have a buzz/hiss/hum coming from the speakers whenever the head unit is on (about half way through the splash screen it starts). Its not noticeable when actually driving. Its a constant so not tied to volume. Its not a big deal but I still want to troubleshoot if its normal since OEM Audio Plus told me it should be completely silent. Can anyone comment if they have buzz/hiss? Especially those with aftermarket amp/speaker but stock head unit? I also notice its tied to the day/night setting of the nav display. In night, with the much darker UI, its just a slight hiss and not noticeable but when in day mode it has quite a buzz. EDIT: I swapped back to stock temporarily just to test... exact same buzz/hiss except quieter (which makes sense since the amp is more powerful hence louder hiss/buzz). Crappy stock head units... grumble grumble __________________ MysteryMachine's build Last edited by MysteryMachine; 02-13-2014 at 12:59 AM.

02-17-2014, 02:51 PM	#2
Chimera Senior Member Join Date: Dec 2013 Drives: FRS Location: Atlanta Posts: 1,181 Thanks: 575 Thanked 291 Times in 216 Posts Mentioned: 17 Post(s) Tagged: 1 Thread(s)	I have the exact same thing in my frs when I upgraded the amp. Tried everything. I used a ground loop isolator, which quieted it to about the same as before amp upgrade.. About to do hu upgrade.. Hopefully this will solve permanently __________________ Car Journal: http://www.ft86club.com/forums/showthread.php?p=1513783

02-18-2014, 09:19 AM	#5
Chimera Senior Member Join Date: Dec 2013 Drives: FRS Location: Atlanta Posts: 1,181 Thanks: 575 Thanked 291 Times in 216 Posts Mentioned: 17 Post(s) Tagged: 1 Thread(s)	It's a.. Bad.. Fix, I did it to see if it would work, but I spliced mine directly into the input of the amp.. I'll take a photo later this week __________________ Car Journal: http://www.ft86club.com/forums/showthread.php?p=1513783

02-19-2014, 02:51 AM	#6
labskaus Member Join Date: Dec 2012 Drives: Toyota GT86 Location: Germany Posts: 94 Thanks: 6 Thanked 17 Times in 15 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	I have the same poblem ... I think the leyless system is resonsable for the dissortion __________________ Building Thread: Competition Sound Installation for GT86

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02-17-2014, 02:53 PM	#3
sshole Banned Join Date: Jan 2014 Drives: BRZ Location: VA Posts: 594 Thanks: 201 Thanked 389 Times in 195 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	I've had the same thing since day 1 of ownership. No idea how to make it go away, but it really doesn't bother me since most of my time in the car is at 70+ mph...

02-20-2014, 12:02 AM	#8
kludger Senior Member Join Date: Oct 2012 Drives: '13 Boxter S, '13 BRZ(gone) Location: SE PA Posts: 235 Thanks: 309 Thanked 103 Times in 57 Posts Mentioned: 9 Post(s) Tagged: 0 Thread(s)	I have the same hiss on a BRZ limited with OEM Audio+ and similarly I only notice it when listening with loud volume while the car is stopped and the music is some acoustic music with quiet section. Not a deal breaker for me since I don't notice it most of the time and the systems sounds awesome otherwise, but would be cool if there was a reasonable fix.

12-12-2014, 01:42 AM	#9
rdrdtheta Member Join Date: Feb 2014 Drives: 2017 Subaru BRZ Limited 6MT Location: Colorado Posts: 13 Thanks: 0 Thanked 2 Times in 2 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Did changing out the head unit solve any of the hissing issue?

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