Underseat subs not working

BimwaPSR · 04-13-2020, 03:31 PM

Hi Guys

I bought a e93 330D a few months ago now and I love the car overall - great driving experience, enough power for what I need and looks amazing. The only thing that is letting it down for me is the sound system & some how I only noticed today after poking my head under the seat that the underseat subwoofers are not working.

My knowledge is fairly basic but have searched the forums and watched a fair few videos but wanted to get some help before I start ripping the car apart to try and fix the fault.

The system I have is the Base BMW Professional. From what I have read as there is sound coming from the front/rear speakers its unlikely to be the fuse? & as this is the poverty spec sound system I think I am right in saying there isn't an Amp as it draws power directly from the HU.

Are there any basic areas for me to check first that I might be missing?

Thanks in advance.

PSR

ctuna · 04-13-2020, 05:21 PM

BimwaPSR · 04-13-2020, 05:43 PM

Quote:

Originally Posted by ctuna

Hi - thanks for the reply.

I have read most if not all of those links at this point and know the Base system is pants and what my options are to upgrade but I want to get the underseat speakers working again before thinking about upgrading tbh.

I have had a look inside and both appear to be plugged in correctly so unsure what is going wrong considering all the other speakers are working fine. Before I go ahead and get some used replacements from eBay is there anything else you would suggest checking over or testing?

Thanks

PSR

ctuna · 04-13-2020, 06:20 PM

Depending on the year of the Car and build date the parallel connection is made
either right at the under seat speaker connector or in the door sill.
If the previous owner modified the car there is a possibility they may
not be connected.
Use and Ohm meter to ohm them out or check the connection.
There was one case on there where a guy wondered why he
wasn't getting sound and it turned out there were no speakers
in some locations.

base system wiring pre/post 3/09
https://www.google.com/url?sa=t&rct=...tDpLJPcGkw_ui_

streetpro · 04-14-2020, 05:55 AM

Unbolt the seat (4 torx), undo plastic covers (6 philips) and examine the enclosure/speaker... there is a joint/connector (either 2 or 4 wires) that powers them... while you are there, run a speaker cable down to the boot for later upgrade to an amp... as it will surely follow anyway... and do not buy any used other than L7 or Jehnert 8'' to skip the disappointment...

BimwaPSR · 04-28-2020, 05:00 PM

Hi guys

Turns out both subs were unplugged by the previous owner which explains the lack of sound.. I plugged them both back in and 1 is broken so will need to replace.

The one that did work however wasn't moving much air at all - I turned up the sound but its like they weren't even there. I know the base unit is crap but is it really THAT bad?

As I am going to have to buy at least 1 new sub is there any speakers I can just drop straight in to replace that are better than the OEM? or is it not worth replacing these speakers if I am not going to also install an amp etc?

E92x7z · 04-28-2020, 06:07 PM

say how much money is given to you for 2 speakers under the seats and only until there will you stop this audio upgrade

if you buy new aftermarket speakers without an amplifier it makes no sense not only basic is a horror to me all variants without an individual are a horror if you don't spend money just replace the speakers with such 2 hands for me and if they replace those on the front doors it will make a difference + and not those under the seats)

ctuna · 04-28-2020, 06:31 PM

"The one that did work however wasn't moving much air at all - I turned up the sound but its like they weren't even there. I know the base unit is crap but is it really THAT bad?"

Yes it's that bad and next system up is pretty bad to especially if
you are expecting even normal bass.
It's like the under seats aren't even there.

Base system in no pants
Hi Fi is pants down.

04-13-2020, 03:31 PM	#1
BimwaPSR New Member 2 Rep 14 Posts Drives: e92 330i Join Date: Apr 2020 Location: Surrey iTrader: (0) Garage List 2007 330i [0.00]	Underseat subs not working - Base system Hi Guys I bought a e93 330D a few months ago now and I love the car overall - great driving experience, enough power for what I need and looks amazing. The only thing that is letting it down for me is the sound system & some how I only noticed today after poking my head under the seat that the underseat subwoofers are not working. My knowledge is fairly basic but have searched the forums and watched a fair few videos but wanted to get some help before I start ripping the car apart to try and fix the fault. The system I have is the Base BMW Professional. From what I have read as there is sound coming from the front/rear speakers its unlikely to be the fuse? & as this is the poverty spec sound system I think I am right in saying there isn't an Amp as it draws power directly from the HU. Are there any basic areas for me to check first that I might be missing? Thanks in advance. PSR
	Appreciate 0 Tweet Quote

04-13-2020, 05:21 PM	#2
ctuna Lieutenant General 2045 Rep 13,364 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	The front door speakers are wired in parallel with the doors , no fuse. The output of the whole system it terribly weak even the next level Hi Fi system is pretty bad. http://www.e90post.com/forums/attach...5&d=1493273253 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.e90post.com/forums/showthread.php?t=138949 http://www.e90post.com/forums/attach...1&d=1209780865 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...1&d=1209780605 http://www.e90post.com/forums/showthread.php?t=641323 http://www.e90post.com/forums/attach...4&d=1278871872 http://www.e90post.com/forums/showthread.php?t=343673 Base System Upgrades http://www.e90post.com/forums/showthread.php?t=1378833 base system wiring pre/post 3/09 https://www.google.com/url?sa=t&rct=...tDpLJPcGkw_ui_ http://www.e90post.com/forums/attach...1&d=1411521234 http://www.e90post.com/forums/showth...ghlight=Dotech http://www.bimmerfest.com/forums/sho...d.php?t=550771 http://www.e90post.com/forums/showthread.php?t=445266 http://www.e90post.com/forums/showthread.php?t=581379 http://www.e90post.com/forums/showthread.php?t=494299 http://www.e90post.com/forums/showthread.php?t=451941 http://www.e90post.com/forums/showth...ht=amp+upgrade http://www.e90post.com/forums/showthread.php?t=540954 http://f30.bimmerpost.com/forums/sho....php?t=1003810 http://www.e90post.com/forums/showth...1#post16679904 http://www.e90post.com/forums/showthread.php?t=822366 http://www.diymobileaudio.com/forum/...morel-jbl.html http://www.e90post.com/forums/attach...1&d=1411521234 http://www.1addicts.com/forums/showthread.php?t=634957 http://www.e90post.com/forums/showthread.php?t=495855 http://www.e90post.com/forums/showthread.php?t=495855 http://www.e90post.com/forums/attach...1&d=1411521234 http://www.1addicts.com/forums/showthread.php?t=634957
	Appreciate 0 Quote

04-13-2020, 06:20 PM	#4
ctuna Lieutenant General 2045 Rep 13,364 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	Depending on the year of the Car and build date the parallel connection is made either right at the under seat speaker connector or in the door sill. If the previous owner modified the car there is a possibility they may not be connected. Use and Ohm meter to ohm them out or check the connection. There was one case on there where a guy wondered why he wasn't getting sound and it turned out there were no speakers in some locations. base system wiring pre/post 3/09 https://www.google.com/url?sa=t&rct=...tDpLJPcGkw_ui_
	Appreciate 0 Quote

04-14-2020, 05:55 AM	#5
streetpro Second Lieutenant 88 Rep 239 Posts Drives: e92 335iA Join Date: Nov 2018 Location: Prague iTrader: (0) Garage List 2006 Bmw e92 335iA [0.00]	Unbolt the seat (4 torx), undo plastic covers (6 philips) and examine the enclosure/speaker... there is a joint/connector (either 2 or 4 wires) that powers them... while you are there, run a speaker cable down to the boot for later upgrade to an amp... as it will surely follow anyway... and do not buy any used other than L7 or Jehnert 8'' to skip the disappointment... __________________ "If everything seems under control, you're not going fast enough.” Mario Andretti
	Appreciate 0 Quote

04-28-2020, 05:00 PM	#6
BimwaPSR New Member 2 Rep 14 Posts Drives: e92 330i Join Date: Apr 2020 Location: Surrey iTrader: (0) Garage List 2007 330i [0.00]	Hi guys Turns out both subs were unplugged by the previous owner which explains the lack of sound.. I plugged them both back in and 1 is broken so will need to replace. The one that did work however wasn't moving much air at all - I turned up the sound but its like they weren't even there. I know the base unit is crap but is it really THAT bad? As I am going to have to buy at least 1 new sub is there any speakers I can just drop straight in to replace that are better than the OEM? or is it not worth replacing these speakers if I am not going to also install an amp etc?
	Appreciate 0 Quote

04-28-2020, 06:07 PM	#7
E92x7z Private First Class 21 Rep 131 Posts Drives: BMW e92 330 Join Date: Mar 2020 Location: Bulgaria iTrader: (0)	say how much money is given to you for 2 speakers under the seats and only until there will you stop this audio upgrade if you buy new aftermarket speakers without an amplifier it makes no sense not only basic is a horror to me all variants without an individual are a horror if you don't spend money just replace the speakers with such 2 hands for me and if they replace those on the front doors it will make a difference + and not those under the seats)
	Appreciate 0 Quote

04-28-2020, 06:31 PM	#8
ctuna Lieutenant General 2045 Rep 13,364 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	"The one that did work however wasn't moving much air at all - I turned up the sound but its like they weren't even there. I know the base unit is crap but is it really THAT bad?" Yes it's that bad and next system up is pretty bad to especially if you are expecting even normal bass. It's like the under seats aren't even there. Base system in no pants Hi Fi is pants down.
	Appreciate 0 Quote

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search