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having worked on dozens of E90s 3 series, it was a nice step forward to see a new F30 3 series for us to play with. A big thanks to Ken AKA VPelectricity of MusicarNW for providing valuable insight into the car, its similarities and differences from the E90 to help make this build a smooth one week affair 
The oem system, sad to say, is a step DOWN from the E90's comparable design, it sounds okay at low to moderate volume, with of course, VERY little bass response below 100hz, but when pushed even a little, the system really falls flat on its face and starts distorting...this made more sense when Ken told me the new OEM amp is a much cheaper chip amp, compared to before and cheaper drivers are used throughout...kinda sad for a new and improved model...but cest la vie
the goals were simple:
1. achieve a much improved overall sound quality than the oem system
2. maintain a totally oem appearance in the interior
3. maintain a mostly oem look in the trunk, with the only space allowed to be taken up being the side cubby space and the infloor storage bin (car has no spare tire oem)
lets get started:
with the mosconi 6to8V8 providing tuning for the system, all adjustments can be done from the front seat using a BT enabled laptop:
the front door midrange and tweeter was replaced with a set of Morel Hybrid 4" two way components, first, two sets of speaker wires were run into the doors, it is of note that unlike the E90, the F30 does not have a big gap around the molex opening in the door to run wires into, instead, it has a round cutout in the molex for that purpose. our man jesse did most of the wiring work in the interior and i took care of the trunk
the wires were ziptied to the oem bundles and run to their respective places:
every cable in the car was run down the driver side, to ensure it stays away from the oem power cable between the alternator and the battery, traditionally a EMI hotbed, it is ziptied and organized every few inches:
to mount the morel hybrid midrange in the stock location, i fabricated this custom spacer, it matches the shape of the oem midrange at the moutning flange, with a rabetted ring ontop to allow the morel to snap direct into, the were then coated with several layers of truck bedliner to protect them against the elements:
the midrange was then installed into the door and the edges sealed with 3m strip caulk, a bit of damper was then used around the midrange to help with resonance. the morel tweeters, just like on the E90s, were a pretty good oem fitment to the stock sail panels:
for the underseat oem woofers, we used a pair of the new and improved gladen oem fitment 8" drivers, these have a different basket and design and also comes with an integrated grille, to prevent debris from falling into the the woofer cone and causing a buzz. the oem underseat enclosures were removed, taken apart and sound proofed, and the gladen drivers installed:
they were then bolted back into the car, wired up using the oem wires (whcih are of pretty significant gauge) and the oem grille installed back in place for seamless stock look:
so thats it for the interior, moving to the trunk. here you see the wiring bundle entire into the trunk and ziptied to the stock bundle:
the oem amp was rmoved, and in its place, i fabricated this simple moutning baffle for the Mosconi 6ot8DSP
this was then installed and wired up:
the customer allowed us to take up the entire storage well so all the wires were then routed into the well, signal on one side, and power/ground from the other side, it should also be noted that we used one of Technic's (a well known provider of bmw integration harnesses on various forums) F30 adapter harness and it worked great
The oem system, sad to say, is a step DOWN from the E90's comparable design, it sounds okay at low to moderate volume, with of course, VERY little bass response below 100hz, but when pushed even a little, the system really falls flat on its face and starts distorting...this made more sense when Ken told me the new OEM amp is a much cheaper chip amp, compared to before and cheaper drivers are used throughout...kinda sad for a new and improved model...but cest la vie
the goals were simple:
1. achieve a much improved overall sound quality than the oem system
2. maintain a totally oem appearance in the interior
3. maintain a mostly oem look in the trunk, with the only space allowed to be taken up being the side cubby space and the infloor storage bin (car has no spare tire oem)
lets get started:
with the mosconi 6to8V8 providing tuning for the system, all adjustments can be done from the front seat using a BT enabled laptop:
the front door midrange and tweeter was replaced with a set of Morel Hybrid 4" two way components, first, two sets of speaker wires were run into the doors, it is of note that unlike the E90, the F30 does not have a big gap around the molex opening in the door to run wires into, instead, it has a round cutout in the molex for that purpose. our man jesse did most of the wiring work in the interior and i took care of the trunk
the wires were ziptied to the oem bundles and run to their respective places:
every cable in the car was run down the driver side, to ensure it stays away from the oem power cable between the alternator and the battery, traditionally a EMI hotbed, it is ziptied and organized every few inches:
to mount the morel hybrid midrange in the stock location, i fabricated this custom spacer, it matches the shape of the oem midrange at the moutning flange, with a rabetted ring ontop to allow the morel to snap direct into, the were then coated with several layers of truck bedliner to protect them against the elements:
the midrange was then installed into the door and the edges sealed with 3m strip caulk, a bit of damper was then used around the midrange to help with resonance. the morel tweeters, just like on the E90s, were a pretty good oem fitment to the stock sail panels:
for the underseat oem woofers, we used a pair of the new and improved gladen oem fitment 8" drivers, these have a different basket and design and also comes with an integrated grille, to prevent debris from falling into the the woofer cone and causing a buzz. the oem underseat enclosures were removed, taken apart and sound proofed, and the gladen drivers installed:
they were then bolted back into the car, wired up using the oem wires (whcih are of pretty significant gauge) and the oem grille installed back in place for seamless stock look:
so thats it for the interior, moving to the trunk. here you see the wiring bundle entire into the trunk and ziptied to the stock bundle:
the oem amp was rmoved, and in its place, i fabricated this simple moutning baffle for the Mosconi 6ot8DSP
this was then installed and wired up:
the customer allowed us to take up the entire storage well so all the wires were then routed into the well, signal on one side, and power/ground from the other side, it should also be noted that we used one of Technic's (a well known provider of bmw integration harnesses on various forums) F30 adapter harness and it worked great