Bass going pop

TripleD · 08-10-2012, 04:36 AM

Think I found a flaw with the audio system, not sure if it's just my car, or a general issue.

Was driving to work this morning and noticed that the bass started to making a pop sound when going at speed. Not sure if it was the air pressure from the sun roof being on tilt, or just because the bass speakers are located under the seats so are subject to some pressures from under the car?

when slowing down it went back to normal.

makkan00 · 08-10-2012, 06:36 AM

It should not happen like that.
Subs are fixed in tight enclosures and they open to side skirts.
If there is any air gap / opening into your side skirts, then it may be possible as you mentioned.

Experiment again to see if it is happening or you are just getting anxious about it.

m3gtr · 08-10-2012, 03:33 PM

Were you listening to DAB radio by any chance? I get the same but only on DAB and I think it is the signal and not the audio system.

TripleD · 08-10-2012, 04:18 PM

Na, had some prodigy on the iPod.

I did it twice and it made the sound both times, just thought it was strange.

mob17 · 08-10-2012, 08:38 PM

I used to have the exact same problem. Whenever i went over 50-60mph with a window down the woofers popped. Windows closed then no problem. But ever since replacing my underseats its never happened.

AdrianSi · 08-12-2012, 03:48 AM

Are you sure its not due to an increase in volume due to speed sensitive volume settings? Or is this on low volume anyhow?

mob17 · 08-12-2012, 06:00 AM

Nope mine was always set to minimum, not sure about OP

TripleD · 08-12-2012, 08:36 AM

Yeah it was reasonable now massively loud.

mob17 · 08-12-2012, 09:00 AM

The only solution i can suggest is taking your enclosures out and making sure the woofers are sealed properly.

B33M3R · 08-12-2012, 12:30 PM

I suspect to be able to hear your stereo with the window down at speed you have it pretty much on max, especially if you're hoping to hear any bass from the OE under seats. It's probably just clipping (volume up so loud the HU has run out of steam)

You're probably just on the limits of your stereo. I also second the possibility of the speed dependant volume tipping the scales.

08-10-2012, 04:36 AM	#1
TripleD Captain 148 Rep 706 Posts Drives: Audi S4 Avant Join Date: Jan 2012 Location: Suffolk, UK iTrader: (0)	Bass going pop Think I found a flaw with the audio system, not sure if it's just my car, or a general issue. Was driving to work this morning and noticed that the bass started to making a pop sound when going at speed. Not sure if it was the air pressure from the sun roof being on tilt, or just because the bass speakers are located under the seats so are subject to some pressures from under the car? when slowing down it went back to normal.
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08-10-2012, 06:36 AM	#2
makkan00 Major General 886 Rep 9,097 Posts Drives: F83 and F36 Join Date: Dec 2011 Location: Essex iTrader: (56)	It should not happen like that. Subs are fixed in tight enclosures and they open to side skirts. If there is any air gap / opening into your side skirts, then it may be possible as you mentioned. Experiment again to see if it is happening or you are just getting anxious about it. __________________ F36 Xdrive for her - HUD, park assist, heated steering wheel, rear camera, Apple car play F36 RWD for him - HK, M sports pack, GTS tail light, Apple car play
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08-10-2012, 03:33 PM	#3
m3gtr New Member 2 Rep 25 Posts Drives: E92 335d Join Date: Jan 2012 Location: Midlands iTrader: (0) Garage List 2007 BMW 335d [10.00]	Were you listening to DAB radio by any chance? I get the same but only on DAB and I think it is the signal and not the audio system.
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08-10-2012, 04:18 PM	#4
TripleD Captain 148 Rep 706 Posts Drives: Audi S4 Avant Join Date: Jan 2012 Location: Suffolk, UK iTrader: (0)	Na, had some prodigy on the iPod. I did it twice and it made the sound both times, just thought it was strange.
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08-10-2012, 08:38 PM	#5
mob17 Major General 400 Rep 5,623 Posts Drives: E92 335D Join Date: Mar 2012 Location: East Midlands, UK iTrader: (5)	I used to have the exact same problem. Whenever i went over 50-60mph with a window down the woofers popped. Windows closed then no problem. But ever since replacing my underseats its never happened.
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08-12-2012, 03:48 AM	#6
AdrianSi Second Lieutenant 9 Rep 228 Posts Drives: E90 330d LCi MSport Join Date: Jul 2011 Location: Midlands, UK iTrader: (1)	Are you sure its not due to an increase in volume due to speed sensitive volume settings? Or is this on low volume anyhow? __________________ E90 330d - N57 Prof Nav - 6FL - Visability Pack - Alpine Hi-Fi Upgrade - L7 Subwoofers - L7 rear mids + tweeters - 6FL
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08-12-2012, 06:00 AM	#7
mob17 Major General 400 Rep 5,623 Posts Drives: E92 335D Join Date: Mar 2012 Location: East Midlands, UK iTrader: (5)	Nope mine was always set to minimum, not sure about OP
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08-12-2012, 08:36 AM	#8
TripleD Captain 148 Rep 706 Posts Drives: Audi S4 Avant Join Date: Jan 2012 Location: Suffolk, UK iTrader: (0)	Yeah it was reasonable now massively loud.
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08-12-2012, 09:00 AM	#9
mob17 Major General 400 Rep 5,623 Posts Drives: E92 335D Join Date: Mar 2012 Location: East Midlands, UK iTrader: (5)	The only solution i can suggest is taking your enclosures out and making sure the woofers are sealed properly.
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08-12-2012, 12:30 PM	#10
B33M3R Captain 96 Rep 831 Posts Drives: F31 335d XD M Sport Join Date: Oct 2010 Location: Cambridgeshire iTrader: (0)	I suspect to be able to hear your stereo with the window down at speed you have it pretty much on max, especially if you're hoping to hear any bass from the OE under seats. It's probably just clipping (volume up so loud the HU has run out of steam) You're probably just on the limits of your stereo. I also second the possibility of the speed dependant volume tipping the scales. __________________ F31 335d M Sport XD - Mineral Grey - Coral Red - 19" 442M - HK Audio - M Sport Plus Pack - Heated Seats Check out my E90stereo install guide - http://www.e90post.com/forums/showthread.php?t=540954
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