E90 E92 BASIC audio Subwoofer install WITHOUT HIFI LOGIC 7. Help? Very quiet sound

MCCoding · 08-07-2022, 04:35 PM

Hi all, first time posting a question/thread here. I normally find what im looking for but it seems no1 is having a similar issue like me????

E92 WITHOUT hifi or logic 7 amp nor the wiring and harness in the boot/trunk area.

So i tapped into the front under seat subwoofers - i couldn't find a wiring diagram anywhere so for anyone else who is looking....:

Only 2 wires for each of the 2 subs

Front left
BLUE BLACK +
BLUE BROWN -

Front right
BLUE BLACK +
BLUE BROWN -

I then connected all 4 wires to a high to low frequency control thingy which rca out to the amp and box.

The issue is that the sound is VERY quiet!
Ive done all the tweaking still nothing...

To confirm its not the tweaking of the controls, I swapped the the rca input from the car to a rca lineout from my phone via a 3.5mm jack... and the sub was pounding the air as it should

So what is the issue/solution?

Thanks in advance

E92Danny · 08-07-2022, 06:06 PM

What year is your e9x

MCCoding · 08-08-2022, 10:02 AM

Quote:

Originally Posted by E92Danny

What year is your e9x

2007

ctuna · 08-08-2022, 12:04 PM

MCCoding · 08-09-2022, 06:48 AM

Yes you're right, sorry.

E92 UK model - basic system with no harness or wiring in trunk area

Tbh i did just want to add a sub rather than change out the whole system to L7. Im lowkey impressed with the stock sound system despite the lack of bass

I DID find a solution to my problem btw, i changed out the LOC converter to a slighlty better one (still a unbranded one). It seemed to fix my *very low sound* issue. So maybe others in a similiar situation could try that..

My current issue atm is trying to find a good remote source. I wired the remote wire to fuse 31 which is the stereo fuse which only turns on when the key is inserted. However the power light on the subwoofer remains on even after the bmw electrics timeout/cut out period. I may try wiring it to the 12v lighter socket fuse instead. Not sure why it stays powered on connected to fuse 31 though 🤔

MCCoding · 08-09-2022, 06:49 AM

08-07-2022, 04:35 PM	#1
MCCoding Programmer and occasional 2 stepper with the ting 0 Rep 19 Posts Drives: E90 N47N, E92 M57, E71 M57 Join Date: Oct 2020 Location: West Midlands iTrader: (0)	E90 E92 BASIC audio Subwoofer install WITHOUT HIFI LOGIC 7. Help? Very quiet sound Hi all, first time posting a question/thread here. I normally find what im looking for but it seems no1 is having a similar issue like me???? E92 WITHOUT hifi or logic 7 amp nor the wiring and harness in the boot/trunk area. So i tapped into the front under seat subwoofers - i couldn't find a wiring diagram anywhere so for anyone else who is looking....: Only 2 wires for each of the 2 subs Front left BLUE BLACK + BLUE BROWN - Front right BLUE BLACK + BLUE BROWN - I then connected all 4 wires to a high to low frequency control thingy which rca out to the amp and box. The issue is that the sound is VERY quiet! Ive done all the tweaking still nothing... To confirm its not the tweaking of the controls, I swapped the the rca input from the car to a rca lineout from my phone via a 3.5mm jack... and the sub was pounding the air as it should So what is the issue/solution? Thanks in advance
	Appreciate 0 Tweet Quote

08-07-2022, 06:06 PM	#2
E92Danny Private 14 Rep 99 Posts Drives: 2010 E92 335i M-Sport Join Date: Nov 2018 Location: West Hartford, CT iTrader: (0)	What year is your e9x __________________ 2010 e92 Alpine white 335i
	Appreciate 0 Quote

08-08-2022, 12:04 PM	#4
ctuna Lieutenant General 1911 Rep 13,103 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	You should also post that you are not in the US. subwoofer threads(As which systems and options are different from country to country) http://www.e90post.com/forums/showpo...2&postcount=66 http://www.e90post.com/forums/showth...t=Ultimate+Sub http://www.e90post.com/forums/showth...ight=subwoofer Base system is extra terrible so with a working subwoofer it wil be a subwoofer with and extra terrible system. But maybe that is what you want. 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/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 https://www.bimmerfest.com/threads/e...n-752.1275694/ base system wiring pre/post 3/09 https://www.google.com/url?sa=t&rct=...tDpLJPcGkw_ui_ Base System Guide http://www.e90post.com/forums/attach...5&d=1493273253
	Appreciate 0 Quote

08-09-2022, 06:48 AM	#5
MCCoding Programmer and occasional 2 stepper with the ting 0 Rep 19 Posts Drives: E90 N47N, E92 M57, E71 M57 Join Date: Oct 2020 Location: West Midlands iTrader: (0)	Yes you're right, sorry. E92 UK model - basic system with no harness or wiring in trunk area Tbh i did just want to add a sub rather than change out the whole system to L7. Im lowkey impressed with the stock sound system despite the lack of bass I DID find a solution to my problem btw, i changed out the LOC converter to a slighlty better one (still a unbranded one). It seemed to fix my very low sound issue. So maybe others in a similiar situation could try that.. My current issue atm is trying to find a good remote source. I wired the remote wire to fuse 31 which is the stereo fuse which only turns on when the key is inserted. However the power light on the subwoofer remains on even after the bmw electrics timeout/cut out period. I may try wiring it to the 12v lighter socket fuse instead. Not sure why it stays powered on connected to fuse 31 though 🤔
	Appreciate 0 Quote

08-09-2022, 06:49 AM	#6
MCCoding Programmer and occasional 2 stepper with the ting 0 Rep 19 Posts Drives: E90 N47N, E92 M57, E71 M57 Join Date: Oct 2020 Location: West Midlands iTrader: (0)	[QUOTE=ctuna;29198338]You should also post that you are not in the US. subwoofer threads(As which systems and options are different from country to country) http://www.e90post.com/forums/showpo...2&postcount=66 http://www.e90post.com/forums/showth...t=Ultimate+Sub http://www.e90post.com/forums/showth...ight=subwoofer Base system is extra terrible so with a working subwoofer it wil be a subwoofer with and extra terrible system. But maybe that is what you want. 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/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 https://www.bimmerfest.com/threads/e...n-752.1275694/ base system wiring pre/post 3/09 https://www.google.com/url?sa=t&rct=...tDpLJPcGkw_ui_ Base System Guide BTW thanks for this
	Appreciate 0 Quote