Center speaker installation

Wermuth · 03-17-2021, 01:26 PM

Hi All,

I'm quite new here - so i hope you will bear over with me if these questions already been answered previously. I have been searching around the forum trying to find some answers to my questions but without any luck. So please feel free to point me in direction of a thread that already answer my questions

1. Would it possible to install a center speaker when the car is fitted with a base audio from the factory (EU car)
I previously been looking at the Bimmertech AlphaOne system and when choosing it for my car the configurator it suggest to buy a center speaker too.
So I contacted Bimmertech and they claim the wiring should already be there and should just be plug and play. For me it seemed very counter-intuitive. So has anyone any knowledge in this ?

2. I'm about to install a speaker upgrade with tweeters in the front doors from HK. (Yes, i know. Bavsound or Bimmertech e.g. would be a option better. But the HK option is very price efficient buying second hand. and it is WAY better than base audio)
I'm also considering upgrading the rear door too - only the mid-tone as i'm not in favour of drilling holes in the interior. I'm not sure about the sound quality from the speakers - the HK normally is installed together with a tweeter so i'm afraid it would be very bass-heavy. Any experience in this ?

Thanks, Christian

Bcborn59 · 03-17-2021, 04:18 PM

My setup.

The first thing I did was Upgrade the Stock HI Fi Amp to the Match AudioTec Fischer Amp, Model UP 7BMW. You will likely have to run a cable from the head unit for an amp if not already installed.

The next thing I did was upgrade the Under seat Sub woofers with the Match AudioTec Fischer Subs, Model UP W8BMW-S. If your base didn't include subs, you can add a stealth 10" in the rear side pocket of the hatch. Greg did a great job here.

https://f48.bimmerpost.com/forums/sh....php?t=1717151

Front Doors Match UP C42BMW-FRT.2 (Component)

- I ordered the H/K Front Door Frame Moldings to mount the tweeters.

Rear Doors Match UP X4BMW-FRT.2 (Coax)

Center Match UP X4BMW-CTR.3 (Coax)

Once this is all done the Amp will get tuned to the system and car by the Dealer

https://www.audiotec-fischer.de/en/match/

Wermuth · 03-28-2021, 04:21 PM

Hi Bcborn59

Thank you very much for the reply and help

I was both lucky and unlucky this weekend. When I disassembled the dashboard I found the wire for the center speaker. I plugged in a HK speaker but there were no signal to it. A bit of measuring with an Ohm-meter found there was no connecting either. So things are not looking good.

My understanding is that the base audio in the EU version don’t even have an amplifier ? So everything is “driven” from the headunit. Do you have any idea on that.

I have upgrade the front doors with HK tweeter and mid-tone. Major difference 👏🏻

The rear doors are with fabric liner so I’m not up for a drilling a hole in fabric. So can it help just updating to HK mid-tone without tweeters ?

All the best, Christian

Bcborn59 · 03-28-2021, 07:05 PM

Quote:

Originally Posted by Wermuth

Hi Bcborn59

Thank you very much for the reply and help

I was both lucky and unlucky this weekend. When I disassembled the dashboard I found the wire for the center speaker. I plugged in a HK speaker but there were no signal to it. A bit of measuring with an Ohm-meter found there was no connecting either. So things are not looking good.

My understanding is that the base audio in the EU version don’t even have an amplifier ? So everything is “driven” from the headunit. Do you have any idea on that.

I have upgrade the front doors with HK tweeter and mid-tone. Major difference ��

The rear doors are with fabric liner so I’m not up for a drilling a hole in fabric. So can it help just updating to HK mid-tone without tweeters ?

All the best, Christian

Unfortunately H/K uses 2 way components in their systems and the rear door panels would need to be drilled and the tweeter mount installed.

Left Rear Tweeter Mount P/N 51427355463 $8.00US

Right Rear Tweeter Mount BMW P/N 51427355463 $8.00US

I would go with 2 way coax speakers for the Rear Doors such as Match UP X4BMW-FRT.2

As the dash had a wire to the center channel, I wonder if the car had the amp wire from the head unit to the amp in the rear storage area so you just need to install an amp Easy job removing the liner to see.

https://f48.bimmerpost.com/forums/sh....php?t=1610748

https://f48.bimmerpost.com/forums/sh....php?t=1177240

The unfortunate part going with different manufacturers of speakers, they may not match for sound quality.

Good Luck

Wermuth · 03-29-2021, 10:44 AM

Quote:

Originally Posted by Bcborn59

Unfortunately H/K uses 2 way components in their systems and the rear door panels would need to be drilled and the tweeter mount installed.

Left Rear Tweeter Mount P/N 51427355463 $8.00US

Right Rear Tweeter Mount BMW P/N 51427355463 $8.00US

I would go with 2 way coax speakers for the Rear Doors such as Match UP X4BMW-FRT.2

As the dash had a wire to the center channel, I wonder if the car had the amp wire from the head unit to the amp in the rear storage area so you just need to install an amp Easy job removing the liner to see.

https://f48.bimmerpost.com/forums/sh....php?t=1610748

https://f48.bimmerpost.com/forums/sh....php?t=1177240

The unfortunate part going with different manufacturers of speakers, they may not match for sound quality.

Good Luck

Thanks a lot for the answer. The drilling is simply to risky and costly if I mess it up.

I have a look at the match speakers. Looks very interesting and both specs and wiring ready to fit.

I pulled the liner to the side - no wiring to amp

. I'm having re-fitted front PDC in a couple of weeks. Let hope we find some wires there and it is just a matter of connecting some plugs for the centre speaker.

Bcborn59 · 03-29-2021, 01:58 PM

Look around and see if you can find a wiring diagram for the base stereo. My first thought is it's a tough upgrade when you have to install all the wiring.

I take it the base model does not have the under seat subs (wiring ????) either as they are powered by the amp.

I'm very surprised the center speaker wires where their and not connected to anything at the other end (Ohm reading). I have read the center speaker is used for the navigation and emergency calling feature too.

But then again I know nothing about the base unit as it is not available in North America. Our base is the Hi-Fi setup.

I believe Match makes the harness to add the Amp, not sure what it does for the wiring to a sub and center. Not an easy task I'm sure, but doable.

I must agree though, adding a tweeter to the front door will make a world of difference, but so does a higher powered amp.

https://www.audiotec-fischer.de/matc...e/adapterIndex

https://www.audiotec-fischer.de/matc...kabel/pp-iso-5

Bcborn59 · 03-29-2021, 04:19 PM

Lots of good info here too.

https://www.motor-talk.de/forum/bmw-x1-f48-b978.html

I Set up translate via google

wcs2229 · 03-29-2021, 09:10 PM

Quote:

Originally Posted by Wermuth

Hi Bcborn59

Thank you very much for the reply and help

I was both lucky and unlucky this weekend. When I disassembled the dashboard I found the wire for the center speaker. I plugged in a HK speaker but there were no signal to it. A bit of measuring with an Ohm-meter found there was no connecting either. So things are not looking good.

My understanding is that the base audio in the EU version don’t even have an amplifier ? So everything is “driven” from the headunit. Do you have any idea on that.

I have upgrade the front doors with HK tweeter and mid-tone. Major difference 👏🏻

The rear doors are with fabric liner so I’m not up for a drilling a hole in fabric. So can it help just updating to HK mid-tone without tweeters ?

All the best, Christian

My understanding is that the base audio has 4 door mid-range speakers and 2 under-seat woofers connected directly to the head unit. Although the wire for a center speaker is there (as part of a common/standard wiring harness), there may not be a port in the head unit to connect it to.

I do not understand how you were testing for that using an ohmmeter, which would send voltage (V) down the wire and measure the current (I) back to calculate the resistance (R) according to R = V/I in ohms. If the wire is not connected to anything, then R would be infinity. If the wire is connected to the head unit, then R may be infinity but the voltage could damage the port.

You may be using a multimeter (or volt-ohm-milliammeter) to try to measure a voltage or current signal, but I do not think many of the inexpensive devices would work for audio frequencies.

Wermuth · 03-30-2021, 02:22 AM

Unfortunately our government surcharge us up to 150% in tax + 25% VAT on a new car, so everything optional extra in Denmark on BMW

I have the subwoofers under the seat - but again driven purely from the headunit. I guess re-fitting an amp is quite the job to begin with. I as understand all wires for the speakers in the doors need to be rewired and also connected to the headunit again. So it more or less a full interior out --> in again.

I'm seeing a BMW specialist in a couple of week in another matter. I have him looking into the center speaker thing.

Thanks a lot for help and support.

Bcborn59 · 03-30-2021, 02:41 PM

Quote:

Originally Posted by Wermuth

Unfortunately our government surcharge us up to 150% in tax + 25% VAT on a new car, so everything optional extra in Denmark on BMW

I have the subwoofers under the seat - but again driven purely from the headunit. I guess re-fitting an amp is quite the job to begin with. I as understand all wires for the speakers in the doors need to be rewired and also connected to the headunit again. So it more or less a full interior out --> in again.

I'm seeing a BMW specialist in a couple of week in another matter. I have him looking into the center speaker thing.

Thanks a lot for help and support.

I know the speakers are powered by the AMP in the HiFi Units. From my reading the Original wiring at the head unit plugs into the Audiotec Fischer adapter which plugs back into the head unit (T). The audiotec Fisher harness plugs into the Audiotec Fischer adapter harness and then goes to the amp. Would be interested to see if wires actually go to the speakers directly from the amp.

Having said that, laying the harness to the hatch area from behind the head unit should just involve removing the door sill to get access under the carpet edge. I can't see any other upholstery (seats) need be removed.

Send an email to Audiotec Fisher and ask if the installation manual is available for the harnesses and if the speakers require complete rewiring to add an amp to the basic audio.

https://www.audiotec-fischer.de/contact

Seeing the center channel wire is there, I would think the upgrade to HiFi wouldn't require much more than adding the upgrade wires. My next question would be is any coding required to tell the head Unit an amp is now powering the speakers. Rather than the head unit itself

wcs2229 · 04-02-2021, 10:24 PM

Looks like a bit more than just wires from head unit to amplifier:

2018 Speakers High 1.pdf

The head unit for base audio may also not be same. Does anyone know for sure?

Wermuth · 04-03-2021, 07:51 AM

wcs2229 :

Thanks a lot for this - this is really helpful. From the looks of ETK there is no ASD module in F48 system but what is the K-CAN4/BDC module that runs further to the S56, S197 and A95 ?

I seem some thing like control units - are these for the ASD module ?

Bcborn59 · 04-03-2021, 12:26 PM

Quote:

Originally Posted by wcs2229

Looks like a bit more than just wires from head unit to amplifier:

Attachment 2569443

The head unit for base audio may also not be same. Does anyone know for sure?

Good day

That .pdf has tweeters, which means it's likely HK. The HK CAN Buss system is totally different than the Hi-fi. Check the technical documents at the start of the forum. I believe I linked it earlier.

I can not find anything anywhere that sujests the head units are different. High powered amp and tweeters. Unsure if the 1 way coax is different.

Some manufactures use lower ohm speakers in the custom systems ie JBL, not sure about HK.

Anyone confirm the speaker ohms in the HK setup.

wcs2229 · 04-03-2021, 05:51 PM

Quote:

Originally Posted by Bcborn59

Good day

That .pdf has tweeters, which means it's likely HK. The HK CAN Buss system is totally different than the Hi-fi. Check the technical documents at the start of the forum. I believe I linked it earlier.

I can not find anything anywhere that sujests the head units are different. High powered amp and tweeters. Unsure if the 1 way coax is different.

Some manufactures use lower ohm speakers in the custom systems ie JBL, not sure about HK.

Anyone confirm the speaker ohms in the HK setup.

Wermuth is installing the HK speakers, including the HK tweeters.

Here is the wiring diagram for the Base audio:

2018 Speakers Base 1.pdf

There are no CANBUS connections from the HU to BDC and amplifier, which may suggest that head units are different. I did not find any definitive information either way (same or different). I think this is important to verify.

Bcborn59 · 04-03-2021, 06:47 PM

https://f48.bimmerpost.com/forums/sh....php?t=1177240

Good info here,

From the last .pdf, you have two speakers in the rear doors???

Your going down the right road, step one is the Base HU different or the same as the Hi-Fi and HK system??

From the document the HK uses the Can Buss to flow to the amp the HiFi does not.

Look at it this way, the Base Unit speakers are wired directly from the head unit plug (+/- wire per speaker. The Hi-Fi Unit has a cable running from the Head Unit to the Amp which then feeds the speakers. For the basic HiFi there are 14 wires going from the head unit to the amp then to the speakers. Aftermarket (Audiotec Fischer) harness's could very well have wire's going bi directional to tie into the OEM speaker harness (unpluded from headunit) at the front and then fed from an added amp. The aftermarket harness plugs into the Head Unit.

Think of the old days two RCA cables were ran from the head Unit to an amp and then you wired the speakers to the amp.

The base unit has all the same speakers as the HiFi less the center dash (but you have center speaker wires).

Have you reached out to Bimmer-tech and Bavsound for input.

wcs2229 · 04-03-2021, 07:03 PM

Here is speaker wiring diagram for HiFi audio:

08_F48 Speakers HiFi 1 .pdf

wcs2229 · 04-03-2021, 07:07 PM

Quote:

Originally Posted by Bcborn59

https://f48.bimmerpost.com/forums/sh....php?t=1177240

Good info here, there must be a European version of this document showing the basic wiring diagram (no amp)

I did not find wiring diagram for Base audio, but I think the 2018 Speakers Base 1.pdf is for the Base audio.

There is only 1 speaker in each door for Base audio. I believe the diagram shows "OR symbol" on the rear speakers.

Bcborn59 · 04-03-2021, 07:22 PM

Quote:

Originally Posted by wcs2229

I did not find wiring diagram for Base audio, but I think the 2018 Speakers Base 1.pdf is for the Base audio.

There is only 1 speaker in each door for Base audio. I believe the diagram shows "OR symbol" on the rear speakers.

If you look at the head unit wiring on that .pdf, there are only 4 pairs. The front doors are fed from the subs. Kind of like HK where the tweeters are fed from the main door speaker. I wonder if their is a resister in the wire from the sub to the door of your car, so the doors act as tweeters and the under seat provides the mid and low range.

This leads me to believe and aftermarket harness tied in at the head unit to the amp may do the trick.

The hi-Fi wiring also has 4 pairs and the 5th wire could be the signal wire to the amp (all will be included in the aftermarket harness.

https://www.bimmer-tech.net/speakers...r-for-bmw/#buy

https://www.bavsound.com/pages/build-your-kit?step=3

Also if you look into the technical documents the only difference on the back of the two Head Units is the GPS Antenna input on the cars with Navigation.

wcs2229 · 04-03-2021, 09:04 PM

Quote:

Originally Posted by Bcborn59

If you look at the head unit wiring on that .pdf, there are only 4 pairs. The front doors are fed from the subs. Kind of like HK where the tweeters are fed from the main door speaker. I wonder if their is a resister in the wire from the sub to the door of your car, so the doors act as tweeters and the under seat provides the mid and low range.

This leads me to believe and aftermarket harness tied in at the head unit to the amp may do the trick.

The hi-Fi wiring also has 4 pairs and the 5th wire could be the signal wire to the amp (all will be included in the aftermarket harness.

https://www.bimmer-tech.net/speakers...r-for-bmw/#buy

https://www.bavsound.com/pages/build-your-kit?step=3

Also if you look into the technical documents the only difference on the back of the two Head Units is the GPS Antenna input on the cars with Navigation.

There are only 4 pairs of wires because the front door speakers are connected to the respective woofers, like in 2-way speakers, with or without simple crossovers (capacitors).

I do not disagree that a wiring harness may work, as long as all the correct connections including the amplifier signal wire. The 12V power cabling should to be checked to see if it is already in place in the rear compartment, or needs to be installed.

I do not disagree that the head units may be the same for Base audio and HiFi audio, only that this should to be checked.

I am not sure bimmer-tech and bavsound would support their amplifiers with the HK speakers he has already bought, instead of their own matched speakers. Custom equalization may be necessary for really good sound.

I hope that Wermuth now has more information and points to consider before spending a lot of money, time and frustration. Unfortunately, I have gone through a lot of DIY experiences in previous cars during my younger days, which is why I now leave my X1 as stock.

Bcborn59 · 04-03-2021, 09:49 PM

Quote:

Originally Posted by wcs2229

There are only 4 pairs of wires because the front door speakers are connected to the respective woofers, like in 2-way speakers, with or without simple crossovers (capacitors).

I do not disagree that a wiring harness may work, as long as all the correct connections including the amplifier signal wire. The 12V power cabling should to be checked to see if it is already in place in the rear compartment, or needs to be installed.

I do not disagree that the head units may be the same for Base audio and HiFi audio, only that this should to be checked.

I am not sure bimmer-tech and bavsound would support their amplifiers with the HK speakers he has already bought, instead of their own matched speakers. Custom equalization may be necessary for really good sound.

I hope that Wermuth now has more information and points to consider before spending a lot of money, time and frustration. Unfortunately, I have gone through a lot of DIY experiences in previous cars during my younger days, which is why I now leave my X1 as stock.

Well said, do your research before doing anything.

I upgraded my Hi-fi system as it was an easy upgrade and lots of documentation on it. I would put it up against any untouched HK system in an x1 and I'd blow it away.

There have been many write ups on OEM systems loosing ground in the audio world to aftermarket upgrades. Many of them very simple.

wcs2229 · 04-04-2021, 08:41 AM

The HiFi audio amplifier has 7 separate pairs of wires to the 7 speakers. The Base audio head unit only has 4 pairs of wires to the 6 speakers, with the front door speakers connected to the under-seat woofers. Additional speaker wiring may be necessary when adding an amplifier.

Bcborn59 · 04-04-2021, 11:41 AM

Question is, does the aftermarket harness take that in to account. Easy fix; remove the 4 leads from each under seat sub, joint the wires together and you have individual direct lines to all doors. Now the subs need power, Would the aftermarket harness have dedicated leads that feed from the amp to reconnect the subs?

Or does adding an amp (plus wiring to amp) and better speakers (leaving everything intact), connected as they are, provide better sound presentation.

If this upgrade is possible, someone in Europe has done it. We in North America will not experience this as the basic stereo is not available here.

https://www.audiotec-fischer.de/en/m...#compatibility

https://www.audiotec-fischer.de/en/m...s/pp-iso-2-pro

03-17-2021, 01:26 PM	#1
Wermuth Enlisted Member 16 Rep 45 Posts Drives: BMW iX3 LCI Join Date: Mar 2021 Location: Denmark, Europe iTrader: (0)	Center speaker installation - Base audio EU Hi All, I'm quite new here - so i hope you will bear over with me if these questions already been answered previously. I have been searching around the forum trying to find some answers to my questions but without any luck. So please feel free to point me in direction of a thread that already answer my questions 1. Would it possible to install a center speaker when the car is fitted with a base audio from the factory (EU car) I previously been looking at the Bimmertech AlphaOne system and when choosing it for my car the configurator it suggest to buy a center speaker too. So I contacted Bimmertech and they claim the wiring should already be there and should just be plug and play. For me it seemed very counter-intuitive. So has anyone any knowledge in this ? 2. I'm about to install a speaker upgrade with tweeters in the front doors from HK. (Yes, i know. Bavsound or Bimmertech e.g. would be a option better. But the HK option is very price efficient buying second hand. and it is WAY better than base audio) I'm also considering upgrading the rear door too - only the mid-tone as i'm not in favour of drilling holes in the interior. I'm not sure about the sound quality from the speakers - the HK normally is installed together with a tweeter so i'm afraid it would be very bass-heavy. Any experience in this ? Thanks, Christian
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03-17-2021, 04:18 PM	#2
Bcborn59 Private First Class 18 Rep 104 Posts Drives: BMW X1 Join Date: Jan 2021 Location: Canada iTrader: (0)	Match Setup My setup. The first thing I did was Upgrade the Stock HI Fi Amp to the Match AudioTec Fischer Amp, Model UP 7BMW. You will likely have to run a cable from the head unit for an amp if not already installed. The next thing I did was upgrade the Under seat Sub woofers with the Match AudioTec Fischer Subs, Model UP W8BMW-S. If your base didn't include subs, you can add a stealth 10" in the rear side pocket of the hatch. Greg did a great job here. https://f48.bimmerpost.com/forums/sh....php?t=1717151 Front Doors Match UP C42BMW-FRT.2 (Component) - I ordered the H/K Front Door Frame Moldings to mount the tweeters. Rear Doors Match UP X4BMW-FRT.2 (Coax) Center Match UP X4BMW-CTR.3 (Coax) Once this is all done the Amp will get tuned to the system and car by the Dealer https://www.audiotec-fischer.de/en/match/
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03-28-2021, 04:21 PM	#3
Wermuth Enlisted Member 16 Rep 45 Posts Drives: BMW iX3 LCI Join Date: Mar 2021 Location: Denmark, Europe iTrader: (0)	Hi Bcborn59 Thank you very much for the reply and help I was both lucky and unlucky this weekend. When I disassembled the dashboard I found the wire for the center speaker. I plugged in a HK speaker but there were no signal to it. A bit of measuring with an Ohm-meter found there was no connecting either. So things are not looking good. My understanding is that the base audio in the EU version don’t even have an amplifier ? So everything is “driven” from the headunit. Do you have any idea on that. I have upgrade the front doors with HK tweeter and mid-tone. Major difference 👏🏻 The rear doors are with fabric liner so I’m not up for a drilling a hole in fabric. So can it help just updating to HK mid-tone without tweeters ? All the best, Christian
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03-29-2021, 01:58 PM	#6
Bcborn59 Private First Class 18 Rep 104 Posts Drives: BMW X1 Join Date: Jan 2021 Location: Canada iTrader: (0)	Base Stereo Look around and see if you can find a wiring diagram for the base stereo. My first thought is it's a tough upgrade when you have to install all the wiring. I take it the base model does not have the under seat subs (wiring ????) either as they are powered by the amp. I'm very surprised the center speaker wires where their and not connected to anything at the other end (Ohm reading). I have read the center speaker is used for the navigation and emergency calling feature too. But then again I know nothing about the base unit as it is not available in North America. Our base is the Hi-Fi setup. I believe Match makes the harness to add the Amp, not sure what it does for the wiring to a sub and center. Not an easy task I'm sure, but doable. I must agree though, adding a tweeter to the front door will make a world of difference, but so does a higher powered amp. https://www.audiotec-fischer.de/matc...e/adapterIndex https://www.audiotec-fischer.de/matc...kabel/pp-iso-5 Last edited by Bcborn59; 03-29-2021 at 02:28 PM..
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03-29-2021, 04:19 PM	#7
Bcborn59 Private First Class 18 Rep 104 Posts Drives: BMW X1 Join Date: Jan 2021 Location: Canada iTrader: (0)	European Forum Lots of good info here too. https://www.motor-talk.de/forum/bmw-x1-f48-b978.html I Set up translate via google
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03-30-2021, 02:22 AM	#9
Wermuth Enlisted Member 16 Rep 45 Posts Drives: BMW iX3 LCI Join Date: Mar 2021 Location: Denmark, Europe iTrader: (0)	Unfortunately our government surcharge us up to 150% in tax + 25% VAT on a new car, so everything optional extra in Denmark on BMW I have the subwoofers under the seat - but again driven purely from the headunit. I guess re-fitting an amp is quite the job to begin with. I as understand all wires for the speakers in the doors need to be rewired and also connected to the headunit again. So it more or less a full interior out --> in again. I'm seeing a BMW specialist in a couple of week in another matter. I have him looking into the center speaker thing. Thanks a lot for help and support.
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04-02-2021, 10:24 PM	#11
wcs2229 First Lieutenant 171 Rep 313 Posts Drives: 2018 BMW X1 F48 xDrive28i Join Date: Mar 2019 Location: Toronto, Canada iTrader: (0)	Looks like a bit more than just wires from head unit to amplifier: 2018 Speakers High 1.pdf The head unit for base audio may also not be same. Does anyone know for sure?
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04-03-2021, 07:51 AM	#12
Wermuth Enlisted Member 16 Rep 45 Posts Drives: BMW iX3 LCI Join Date: Mar 2021 Location: Denmark, Europe iTrader: (0)	wcs2229 : Thanks a lot for this - this is really helpful. From the looks of ETK there is no ASD module in F48 system but what is the K-CAN4/BDC module that runs further to the S56, S197 and A95 ? I seem some thing like control units - are these for the ASD module ?
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04-03-2021, 06:47 PM	#15
Bcborn59 Private First Class 18 Rep 104 Posts Drives: BMW X1 Join Date: Jan 2021 Location: Canada iTrader: (0)	Technical Documents https://f48.bimmerpost.com/forums/sh....php?t=1177240 Good info here, From the last .pdf, you have two speakers in the rear doors??? Your going down the right road, step one is the Base HU different or the same as the Hi-Fi and HK system?? From the document the HK uses the Can Buss to flow to the amp the HiFi does not. Look at it this way, the Base Unit speakers are wired directly from the head unit plug (+/- wire per speaker. The Hi-Fi Unit has a cable running from the Head Unit to the Amp which then feeds the speakers. For the basic HiFi there are 14 wires going from the head unit to the amp then to the speakers. Aftermarket (Audiotec Fischer) harness's could very well have wire's going bi directional to tie into the OEM speaker harness (unpluded from headunit) at the front and then fed from an added amp. The aftermarket harness plugs into the Head Unit. Think of the old days two RCA cables were ran from the head Unit to an amp and then you wired the speakers to the amp. The base unit has all the same speakers as the HiFi less the center dash (but you have center speaker wires). Have you reached out to Bimmer-tech and Bavsound for input. Last edited by Bcborn59; 04-03-2021 at 07:06 PM..
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04-03-2021, 07:03 PM	#16
wcs2229 First Lieutenant 171 Rep 313 Posts Drives: 2018 BMW X1 F48 xDrive28i Join Date: Mar 2019 Location: Toronto, Canada iTrader: (0)	Here is speaker wiring diagram for HiFi audio: 08_F48 Speakers HiFi 1 .pdf
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04-04-2021, 08:41 AM	#21
wcs2229 First Lieutenant 171 Rep 313 Posts Drives: 2018 BMW X1 F48 xDrive28i Join Date: Mar 2019 Location: Toronto, Canada iTrader: (0)	The HiFi audio amplifier has 7 separate pairs of wires to the 7 speakers. The Base audio head unit only has 4 pairs of wires to the 6 speakers, with the front door speakers connected to the under-seat woofers. Additional speaker wiring may be necessary when adding an amplifier.
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04-04-2021, 11:41 AM	#22
Bcborn59 Private First Class 18 Rep 104 Posts Drives: BMW X1 Join Date: Jan 2021 Location: Canada iTrader: (0)	Question is, does the aftermarket harness take that in to account. Easy fix; remove the 4 leads from each under seat sub, joint the wires together and you have individual direct lines to all doors. Now the subs need power, Would the aftermarket harness have dedicated leads that feed from the amp to reconnect the subs? Or does adding an amp (plus wiring to amp) and better speakers (leaving everything intact), connected as they are, provide better sound presentation. If this upgrade is possible, someone in Europe has done it. We in North America will not experience this as the basic stereo is not available here. https://www.audiotec-fischer.de/en/m...#compatibility https://www.audiotec-fischer.de/en/m...s/pp-iso-2-pro Last edited by Bcborn59; 04-04-2021 at 03:33 PM..
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