[Knuppel]

So I want to buy these to upgrade my wife's E91:
- Eton B100T (speakers + tweeters)
- Pioneer GM-D8604 (4 channel amp)
- door pillar things

She has Base audio now, with Professional iDrive HU. I can recode it to hifi. I'll leave the woofers as they are for now. Rear speakers will remain powered from HU, there's only dogs near those.
I don't want to buy a harness, the car has some milage, so i'm looking to save very penny. My solderingskills are fine, trying to figure out basic wiring.

Can I just cut the wires to the subs, send them to the amp, and then send back the signal to the fronts and subs? Or is there more to it? Maybe someone has a picture where the wires run in the car?

[ctuna]

The front seats are wired in parallel with the front doors.
The parallel connection is made either running along the door
sills or at the under seat speaker location depending on the
year of the car pre/post 3/09 (see page 11 +)Alpine pdf

Specifics on the wiring are shown in the Alpine pdf
its the second or third link down after
base system wiring pre/post 3/09

You should read everything in those links though.
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/showthread.php?t=495855
http://www.e90post.com/forums/attach...1&d=1411521234
http://www.1addicts.com/forums/showthread.php?t=634957
http://www.e90post.com/forums/attach...1&d=1411521234
http://www.1addicts.com/forums/showthread.php?t=634957
http://www.e90post.com/forums/showth...hp?t=495855car for E9x.

https://www.posi-products.com/
the above are the best taps made.

[Knuppel]

Ok so I tap into connectors X9385 till X9388.
What's best practise?
- use this and run a long RCA-RCA cable between it
- strip one side of a long RCA cable en connect it
- lenghten the speaker cable and solder a RCA connector to it.


And am I correct to understand that I can input 2 channel, and output 4 channel from the amp?

[mweisdorfer]

To add an amp like a sub woofer amp, you'd have to buy a technique harness

[ctuna]

Most amp's have a one channel in to two channel out function.
If you don't just use a Y to split one input into two.

You don't have to buy a harness for anything .
But making ones is harder and more subject to failure.
What you don't want to do is hack up your factory harness.

If you split this line you are running speaker outs to the Amp
be sure your amp is capable of running speaker out differential
two sided Inputs in which the outside shield on the RCA is not
common ground but one side of the speaker out.

[Knuppel]

Thanks. The amp has speaker line input, they even supply a cable for this (which I dont have because I bought the amp second-hand).
I’ll be using the connectors stated in the Alpine manual, and connect them using splice connectors to the adapter cable. From there run RCA cables to the amp and speaker wires back to the woofers and doors.

Now to figure out how to safely attach the amp to the battery. Thinking about doing this way, but I can’t understand why BMW would allow 100amps on the distribution block connector, yet supply a connector that can only crimp 4mm2 wire. According to a wire calculator I need 25mm2 (4 gauge) for 80amps. According to the manual I need 8 gauge which translates to 10mm.
Fuse added ofcourse.

[streetpro]

My ghetto way of doing the same... btw - I run Eton 100 up front, rear are stock, under seats Earthquake SWS-8 3 ohm version, amp Eton 4x100W rms powering so far just the underseats (+ 12´´ JL in the trunk in the near future)... front is run by Audiotec Fischer DSP amp mounted under the dashboard... it sounds really clean however since I can not at this moment to split the signal from door to underseats, it is hard to limit the freq going to doors... I will ultimately have to run par of wires to them as well...
Don´t mind the mess in the trunk :-)

[Knuppel]

So i took the plunge and added a Pioneer D8604 amplifier, Eton B100T speakers and tweeters, and wired everything up per Alpine retrofit manual. Stock base subs, but will be exchanged.
Now, the doorspeakers have (too) much bass. I set the HPF and LPF to 80hz per amplifier manual. Is this correct? The Eton B100 manual states 150hz, but that leaves nothing? Or is this a normal value for doorspeakers?
I also still have to code ccc to hifi.