Loux
Posts: 3
Joined: Sat Oct 27, 2018 6:59 pm

Adding subwoofer to a base non-HK system?

Mon Oct 29, 2018 9:52 pm

Hello, I’ve been looking for a while on how to tap into the audio of a base system i3’s audio for adding a subwoofer. I find loads of information out there for an upgraded system but non for a base one.

Power needs is straight forward just curious about the audio side. Short of taping the wires inside the door itself. :/

Any information or pointing me in the right direction would be awesome! Thanks


TheMK
Posts: 140
Joined: Tue Sep 18, 2018 8:57 pm

Re: Adding subwoofer to a base non-HK system?

Fri Dec 07, 2018 4:04 pm

The "head unit" is underneath the rear seat. I do not know how much that differs in a base vs Harman system. I do not believe there is any pre-out, but you could take a look underneath there.

Star63
Posts: 15
Joined: Mon Sep 10, 2018 12:05 pm
Location: Finland

Re: Adding subwoofer to a base non-HK system?

Tue Feb 12, 2019 10:42 am

I have a non-HK system. It didn't sound good at all and I decided to improve the set up a bit.
Since the space is limited and I only wanted to have a decent bass I ended up with a small Pioneer active subwoofer. I placed it under the dash and took the signal from the speaker lines. From this angle you can see it but normally you wouldn't even notice it's there:

Image
2014 BMW i3 REX

Star63
Posts: 15
Joined: Mon Sep 10, 2018 12:05 pm
Location: Finland

Re: Adding subwoofer to a base non-HK system?

Tue Feb 12, 2019 10:57 am

I also replaced the midrange door speakers with a two-way system from Audison (APBMW).
I used my 3D printer to make housings for the tweeters:

Image

The original head unit is not very powerful (4 x 25W). I installed a small 4-way amplifier under the rear seat:

Image

Not so heavy or expensive modifications but now I'm really pleased with the sound quality :P
2014 BMW i3 REX

meric13
Posts: 2
Joined: Wed Apr 10, 2019 9:45 am

Re: Adding subwoofer to a base non-HK system?

Wed Apr 10, 2019 9:52 am

Hello
I also want to install a small Focal amplifier under the rear seat. But I do not know where to take 12v power in this area. :oops: :oops: :oops:

Star63
Posts: 15
Joined: Mon Sep 10, 2018 12:05 pm
Location: Finland

Re: Adding subwoofer to a base non-HK system?

Fri Apr 12, 2019 12:53 pm

I took the power from the under dash fuse box.
2014 BMW i3 REX

meric13
Posts: 2
Joined: Wed Apr 10, 2019 9:45 am

Re: Adding subwoofer to a base non-HK system?

Tue Apr 16, 2019 12:51 am

Ok Thanks ;)

Good
Posts: 1
Joined: Wed Jul 10, 2019 2:29 pm

Re: Adding subwoofer to a base non-HK system?

Fri Jul 19, 2019 10:22 am

Star63 wrote:
Tue Feb 12, 2019 10:42 am
I have a non-HK system. It didn't sound good at all and I decided to improve the set up a bit.
Since the space is limited and I only wanted to have a decent bass I ended up with a small Pioneer active subwoofer. I placed it under the dash and took the signal from the speaker lines. From this angle you can see it but normally you wouldn't even notice it's there:

Image

Would you be able to explain or post pictures showing how to wire the Pioneer subwoofer?

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