Upgrading overall sound while keeping the head unit

A couple of years back you guys mentioned I should change the head unit if I want anything to sound good.

I have educated myself and technology is changing so I have this questions for those who know more than me:

Can a line processer like this be used to 'process' the signal from the stock head unit before it is routed to an aftermarket amplifier and speakers ? Do these processor solve the variable impedance from the stock head unit so that everything downstream can be feed at 4 Ohms impedance ?

https://www.crutchfield.com/p_161LC7....html?tp=70736

This guy never mentions once the impedance settings of the system he is setting up. He talks a whole lot about gain and voltage. Is it the same as adjusting resistance (Impedance) but from the other side of the V=RI formula ?

https://www.youtube.com/watch?v=hGVJcn8lASs

Thanks

I don't know about the aftermarket solutions and systems, but if you're just looking for bluetooth streaming of music / navigation and handsfree phone integration to your stock head unit, check out the BlueBus (link). I think Ted mentioned recently he's taking orders again.

This is the more active thread on the m3 forums by the developer (link)

The sound quality is vastly improved, even over CD quality. Developed by a e46 owner, too.

Here's the developer's site for purchase info: https://www.bluebus.dev

https://www.bavsound.com/pages/build-your-kit?step=1

Its not the same as adjusting gain and power output. The impedance mismatch across speakers that BMW put in our car is perfectly designed to work with the amplifier that is in our trunk and only that one. If you change amplifier, you have to follow the amplifier's recommendation on impedance. If impedance is too high or too low, the amplifier will distort the sound. So matching speaker impedance to amplifier should be your number one concern.

This unit, as far as I can tell (and I am not an electronic engineer) takes line-level signal (low signal that comes from our headunit) and massages it to improve all frequencies output including the bass, matching all frequencies to the same level BEFORE you pump that to the amp. I think it does not care about impedance.
But I am talking from basic knowledge.

No, this low output converter only converts balanced differential 5V signal from the deck to more "normalized" low level that aftermarket amps run on.

Processing power you are after are crossovers, this LOC doesn't have any and it isn't its function any way.

The only impedance you may want to worry about is the impedance of speakers in the chain since many amplifiers cannot go lower than 2ohms per channel - not that there are any speakers like that in e46.

Quote:

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Originally Posted by Frankygoes

A couple of years back you guys mentioned I should change the head unit if I want anything to sound good.

I have educated myself and technology is changing so I have this questions for those who know more than me:

Can a line processer like this be used to 'process' the signal from the stock head unit before it is routed to an aftermarket amplifier and speakers ? Do these processor solve the variable impedance from the stock head unit so that everything downstream can be feed at 4 Ohms impedance ?

https://www.crutchfield.com/p_161LC7....html?tp=70736

This guy never mentions once the impedance settings of the system he is setting up. He talks a whole lot about gain and voltage. Is it the same as adjusting resistance (Impedance) but from the other side of the V=RI formula ?

https://www.youtube.com/watch?v=hGVJcn8lASs

Thanks

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No it will not. The amplifier will start distorting if you overdrive the input section.

Quote:

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Originally Posted by Oli77

If impedance is too high or too low, the amplifier will distort the sound.

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