[bytterga]

So i checked polarity on all the speakers in my 2015 f34 and they are all negative exept the tweeters.
Is this a problem?
Wierd that the factory get this wrong.
I have the option to reverse polarity with the DSP tool but then the tweeters go negative.
Leave it as it is or reverse it in the dsp?

[Billfitz]

If they're all the same it doesn't matter. Since the connectors are polarized I wouldn't assume that they're not as they should be.

[Encanto]

Originally Posted by bytterga

So i checked polarity on all the speakers in my 2015 f34 and they are all negative exept the tweeters.
Is this a problem?
Wierd that the factory get this wrong.
I have the option to reverse polarity with the DSP tool but then the tweeters go negative.
Leave it as it is or reverse it in the dsp?

If these are the OEM speakers then tweeters are wired in parallel with the mids, so if the mids are reversed wired then so are the tweeters.

[bytterga]

Originally Posted by Encanto

If these are the OEM speakers then tweeters are wired in parallel with the mids, so if the mids are reversed wired then so are the tweeters.

The front speakers and tweeters are not oem but plug and play from Match with passive crossover to the tweeters. Both speakers and tweeters have bmw connectors so it cant be innstalled wrong.
I was thinking it was the Match speakers that was wired wrong inside but checking the rear oem speakers they also had negative polarity .
Wierd 😒

[bytterga]

Originally Posted by Billfitz

If they're all the same it doesn't matter. Since the connectors are polarized I wouldn't assume that they're not as they should be.

So it does not matter as long as all speakers are negative? What about the tweeters that are plus?
They have passive crossovers so they will be negative when speakers are positive and vice versa 🤔
This cant be good for the sound quality or?

[Billfitz]

You said that there's a passive crossover. If that crossover consists of a 2nd order lowpass on the mids and 2nd order high pass on the tweeters the total phase shift between the mids and tweeters is 180 degrees, which would result in a response dip centered at the crossover frequency. Wiring the tweeters with reverse polarity eliminates the phase shift, and along with it the response dip. While on the subject, most loudspeaker designers avoid using 2nd order/2nd order crossovers for just this reason. A 2nd order low pass/3rd order high pass doesn't give a 180 degree phase shift, so there's no response dip, and the additional 6dB/octave roll off of the signal to the tweeter below the corner frequency offers better protection to the tweeter and lower THD.

[bytterga]

Originally Posted by Billfitz

You said that there's a passive crossover. If that crossover consists of a 2nd order lowpass on the mids and 2nd order high pass on the tweeters the total phase shift between the mids and tweeters is 180 degrees, which would result in a response dip centered at the crossover frequency. Wiring the tweeters with reverse polarity eliminates the phase shift, and along with it the response dip. While on the subject, most loudspeaker designers avoid using 2nd order/2nd order crossovers for just this reason. A 2nd order low pass/3rd order high pass doesn't give a 180 degree phase shift, so there's no response dip, and the additional 6dB/octave roll off of the signal to the tweeter below the corner frequency offers better protection to the tweeter and lower THD.

Thanks for the reply.
After hours of googling i think i get this now 🙂
Sent a message to the shop and they said the same as you.
Had no idea but then again i am a newbie at the audio stuff.