Hu-850 audio cutting out at high volume

r16hdj · Nov 9th, 2015, 20:22

I have an 06 S60 with HU-850 head unit, the pro logic one with amp under drivers seat. The problem is that when I turn it up quite loud, the audio cuts out completely. The HU still functions, just no audio. If I turn the volume down, a few seconds later the audio returns.

I understand that the HU internal amp drives the centre speaker with the under seat amp driving the rest. When the audio cuts out, all the speakers including the centre one cut out. This suggests that the problem is with the head unit. However......

Last week I changed the head unit for an aftermarket one but I still have the same problem.

Anyone have any suggestions please?

Dzega · Nov 10th, 2015, 11:23

does this behaviour is dependant on wether engine is running or not?

Brendan W · Nov 10th, 2015, 11:53

Can't resist this.
Are you sure it's not your ears cutting out

r16hdj · Nov 10th, 2015, 19:01

Brendan, I am getting on a bit but I dont think so!

Dzega, it does it when driving, never tried without engine running. Shall I? What are your thoughts?

reggit · Nov 11th, 2015, 11:54

Does it cut out immediately or after a certain duration?

Is there crap under the seat preventing the amp from cooling?

blueacid · Nov 11th, 2015, 14:04

if you're in dolby pro logic mode does the centre speaker keep working? Does it ever produce sound?

r16hdj · Nov 11th, 2015, 17:32

It will cut out on the first or second loud bass beat after ive turned up the volume to a high level.

Theres nothing under the seat (other than the amp).

With the oem head unit fitted, the centre speaker would also cut out so no sound at all. This is why i thought it might be a problem with the head unit. Ive replaced the HU with an aftermarket one (so ive lost the use of the centre speaker completely now) but the sound still cuts out if I turn it up above 20 (volume goes up to 30)

Nov 9th, 2015, 20:22	#1
r16hdj New Member Last Online: Nov 28th, 2015 20:32 Join Date: Nov 2015 Location: Fareham	Hu-850 audio cutting out at high volume I have an 06 S60 with HU-850 head unit, the pro logic one with amp under drivers seat. The problem is that when I turn it up quite loud, the audio cuts out completely. The HU still functions, just no audio. If I turn the volume down, a few seconds later the audio returns. I understand that the HU internal amp drives the centre speaker with the under seat amp driving the rest. When the audio cuts out, all the speakers including the centre one cut out. This suggests that the problem is with the head unit. However...... Last week I changed the head unit for an aftermarket one but I still have the same problem. Anyone have any suggestions please?

Nov 10th, 2015, 11:23	#2
Dzega Junior Member Last Online: Aug 5th, 2016 09:12 Join Date: Jul 2015 Location: Riga	does this behaviour is dependant on wether engine is running or not? __________________ S80 2.4 AT 2002MY

Nov 11th, 2015, 11:54	#5
reggit Premier Member Last Online: Yesterday 16:49 Join Date: Feb 2012 Location: Preston	Does it cut out immediately or after a certain duration? Is there crap under the seat preventing the amp from cooling? __________________ 2009 Volvo V70 D5 (Polestar 225bhp) r-design 180,000 miles

Nov 10th, 2015, 11:53	#3
Brendan W Premier Member Last Online: Apr 2nd, 2024 19:50 Join Date: Dec 2007 Location: Wexford	Can't resist this. Are you sure it's not your ears cutting out

Nov 10th, 2015, 19:01	#4
r16hdj New Member Last Online: Nov 28th, 2015 20:32 Join Date: Nov 2015 Location: Fareham	Brendan, I am getting on a bit but I dont think so! Dzega, it does it when driving, never tried without engine running. Shall I? What are your thoughts?

Nov 11th, 2015, 14:04	#6
blueacid Senior Member Last Online: Yesterday 12:02 Join Date: Oct 2013 Location: Manchester	if you're in dolby pro logic mode does the centre speaker keep working? Does it ever produce sound?

Nov 11th, 2015, 17:32	#7
r16hdj New Member Last Online: Nov 28th, 2015 20:32 Join Date: Nov 2015 Location: Fareham	It will cut out on the first or second loud bass beat after ive turned up the volume to a high level. Theres nothing under the seat (other than the amp). With the oem head unit fitted, the centre speaker would also cut out so no sound at all. This is why i thought it might be a problem with the head unit. Ive replaced the HU with an aftermarket one (so ive lost the use of the centre speaker completely now) but the sound still cuts out if I turn it up above 20 (volume goes up to 30)

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