Build Help! what do I need?

[venturejordi]

Hey looking for some advice from some real audiophiles.

I have a 2009 BMW e92 335i equipped with the 825w 16 speaker individual audio system.

Mids and Highs are Amazing, however the bass is lacking. I am looking to add just a little more to the low end.

What should I do. On BMW forms most recommend a Sub in the trunk, or replacing the factory 8" subs that are under the seats. all my inputs to the system is done through a nexus 7, and a fiio e10k dac into the factory 3.5mm in the arm rest.

Question ONE: get RCA out and remote from factory system

I have a wiring harness to add an amp, but it just gives high level outputs(35+ volts so i was told). the cheap line level converter didn't work. I was also told that because the factory amp is class D you cannot get a remote power on for the amps out from those signals.

I am trying to replicate this (https://technicpnp.com/product/premium-harness-wlc2i/) I found a harness used, but dont have the LC2i.

Question TWO! replace under seat subs, or box in the trunk.

With adapters The only under seat subs I know will fit is the SWS-8 2ohm or 4ohm (Link 4ohm) Would also need a 2 channel amp to run them in stereo. has anyone with a trained ear heard these subs? any good?

Or what kind of setup could I do in the trunk. I would Like to keep it small probably a single 10 or even a good 8 is fine. SQ setup. Not looking to blow my ears off, and BMWs are sensitive if you look at it wrong you get a check engine light. would adding a 3rd sub to the environment sound odd? I have a mini DSP 2x4 from a previous build that might help with tuning it. Budget would be around 200-250 usd, but I would probably try to find something used local. (905 Area)

Sorry for the long post, I jump around with my thoughts a lot just ask if you need somthing clarified. lol

Thanks for any help

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[trumpet 5,000+ posts]

CDT Audio now has direct fit BMW underseat subwoofers for this application: http://www.cdtdealer.com/rubyserv/item.php?id=bm8sub12

I can ship these to Canada although it does get costly.

If you have a line out converter or amplifier with high level inputs and DC offset sensing that will do the auto remote on/off on any factory amplifier.

 

[venturejordi]

CDT Audio now has direct fit BMW underseat subwoofers for this application: http://www.cdtdealer.com/rubyserv/item.php?id=bm8sub12I can ship these to Canada although it does get costly.

If you have a line out converter or amplifier with high level inputs and DC offset sensing that will do the auto remote on/off on any factory amplifier.

Thanks, Didn't know about that option.

 

[nbmetalworx]

I have an 08 bmw m3 e93

I have been researching for several weeks on what to do for my car also

I purchased the following after a lot of checking

Jl audio 600 watt sub amp

Jl audio 10w3. 10 inch 2 ohm sub

Audio control lc2i line converter

Plan to install in the next week or so by tapping the lc2i into the sub wires coming out of the factory amp. Box is going to be a thru ski port design that I build myself due to not being able to find a manufactured box that fits that need.

I a, going to build it sealed due to not actually knowing how to calculate a small round port that would work correctly

This is what I plan for it to look like when I am finished , found this on a bimmer site.

Sent from iPad

Nbmetalworx.com

 

[k5james 10+ year member]

I've always had great luck with Navone LOCs.