Sub in the boot stoped working

jharar · 02-06-2018, 08:46 AM

As the title says, I was driving home yesterday listening to the music sub in the boot was working fine, all of sudden Bass stopped coming out from the Subwoofer.

I checked today my Amp which is working as i put the key in, headunit comes on so does the Amp.
It lights up, But Subwoofer is not working.
I took the fuse out from the Amp then the light went off on the Amp , i put the fuse back Amp light cam back on..

I opened the Sub box to check the wiring just in case they came off thay are all good nicely soldered..

What could it be any ideas?

Head unit is Pioneer SPH DA-120
Amp JBL
Sun JL Audio.

ctuna · 02-06-2018, 09:13 AM

jharar · 02-06-2018, 10:08 AM

My mistake i should of mentioned what set up I have got...
I edited the post now..

david in germany · 02-06-2018, 11:47 AM

Do you have another speaker you can test on the amp? If not get a multimeter and check the resistance of the sub. Should read 1, 2, or 4ohm normally. If the sub is blown it will read infinite resistance or no resistance. Another option is pull out the sub and test it on a home stereo to make sure it isn't blown.

Also check the signal to the amp. No signal, no sound but it will power fine.

jharar · 02-12-2018, 03:43 PM

I borrowed multimeter from one of my friend tested the sub , Funny enough this is the first time ever i used the Multimeter in my life, Lol..

Hope I had right settings on the multimeter.
I think Sub is fine more likely Amp is gone..

Attachment 1767517

Attachment 1767518

Attachment 1767519

david in germany · 02-13-2018, 12:07 AM

Yep, sub reads solid.

02-06-2018, 08:46 AM	#1
jharar Lieutenant 64 Rep 478 Posts Drives: BMW F40 M135i xdrive. Join Date: Oct 2012 Location: Essex iTrader: (0)	Sub in the boot stoped working As the title says, I was driving home yesterday listening to the music sub in the boot was working fine, all of sudden Bass stopped coming out from the Subwoofer. I checked today my Amp which is working as i put the key in, headunit comes on so does the Amp. It lights up, But Subwoofer is not working. I took the fuse out from the Amp then the light went off on the Amp , i put the fuse back Amp light cam back on.. I opened the Sub box to check the wiring just in case they came off thay are all good nicely soldered.. What could it be any ideas? Head unit is Pioneer SPH DA-120 Amp JBL Sun JL Audio. Last edited by jharar; 02-06-2018 at 10:07 AM..
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02-06-2018, 09:13 AM	#2
ctuna Lieutenant General 1911 Rep 13,103 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	No stock subwoofers in the trunk in the three major stereo system types for the e9x as far as I know. Do you have an aftermarket system? Identify your system as a first step this does not mean identify the Head Unit unless you have the base system. BMW stereo types http://www.e90post.com/forums/showthread.php?t=352586 http://www.e90post.com/forums/attach...2&d=1266451970 http://www.e90post.com/forums/attach...2&d=1260829447 http://www.bmwmotorsports.org/pdf/e7...%20Systems.pdf http://www.e90post.com/forums/showthread.php?t=343673 http://www.e90post.com/forums/showthread.php?t=138949 http://www.e90post.com/forums/attach...1&d=1209780605 http://www.e90post.com/forums/attach...1&d=1209780865 http://www.e90post.com/forums/showthread.php?t=641323 http://bmwcoders.com/forum/3-er-8/bm...1-e92-e93-291/ http://technicpnp.com/menuDiagrams/d...e90_92_93.html http://www.musicarnw.com/page-2/ http://www.e90post.com/forums/attach...3&d=1169133185 http://www.e90post.com/forums/attach...4&d=1278871872 Hi Fi system has an 6 channel amp Logic 7 has a 9 channel amp Underseat speakers handle the low frequencys Last edited by ctuna; 02-06-2018 at 09:19 AM..
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02-06-2018, 10:08 AM	#3
jharar Lieutenant 64 Rep 478 Posts Drives: BMW F40 M135i xdrive. Join Date: Oct 2012 Location: Essex iTrader: (0)	My mistake i should of mentioned what set up I have got... I edited the post now..
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02-06-2018, 11:47 AM	#4
david in germany Lieutenant Colonel 729 Rep 1,815 Posts Drives: 118i, 335i and 328i Join Date: Nov 2011 Location: Mannheim Germany iTrader: (2)	Do you have another speaker you can test on the amp? If not get a multimeter and check the resistance of the sub. Should read 1, 2, or 4ohm normally. If the sub is blown it will read infinite resistance or no resistance. Another option is pull out the sub and test it on a home stereo to make sure it isn't blown. Also check the signal to the amp. No signal, no sound but it will power fine. __________________ 2009 118i Monaco Blue "Maximillion" 2009 335i Saphire Black M Sport "Leopold" Cobb stage 2 aggressive tune, Mishimoto FMIC, Cobb charge pipe, Cobb catted down pipes, Forge diverter valves, BMS inlets and DCI, Cyba scoops and M Individual Audio retrofit and M3 gauge cluster retrofit. 2011 328i Titan Silver M Sport "Franzel" <--Wife's car
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02-12-2018, 03:43 PM	#5
jharar Lieutenant 64 Rep 478 Posts Drives: BMW F40 M135i xdrive. Join Date: Oct 2012 Location: Essex iTrader: (0)	I borrowed multimeter from one of my friend tested the sub , Funny enough this is the first time ever i used the Multimeter in my life, Lol.. Hope I had right settings on the multimeter. I think Sub is fine more likely Amp is gone.. Attachment 1767517 Attachment 1767518 Attachment 1767519 Last edited by jharar; 02-12-2018 at 03:50 PM..
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02-13-2018, 12:07 AM	#6
david in germany Lieutenant Colonel 729 Rep 1,815 Posts Drives: 118i, 335i and 328i Join Date: Nov 2011 Location: Mannheim Germany iTrader: (2)	Yep, sub reads solid. __________________ 2009 118i Monaco Blue "Maximillion" 2009 335i Saphire Black M Sport "Leopold" Cobb stage 2 aggressive tune, Mishimoto FMIC, Cobb charge pipe, Cobb catted down pipes, Forge diverter valves, BMS inlets and DCI, Cyba scoops and M Individual Audio retrofit and M3 gauge cluster retrofit. 2011 328i Titan Silver M Sport "Franzel" <--Wife's car
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