The only way to keep the factory controls is to use analog connections from the factory head unit to the processor. But once you get to the processor, there is a two step conversion that goes from Analog to Digital, PROCESS, then from Digital to Analog. So no matter what you get to use the DAC that comes with the processor. To step that up, You have to use either the JL audio piece the Fix 82, which is analog into the fix 82 from the factory speaker wires, then it has a toslink connection that can get you to a myrid of processors. But In doing this you lose the factory steering wheel controls.
To use your Oppo, the best method is to use the Mosconi, run the speaker wires from the factory head into the mosconi, and then plug your phone into the oppo and the oppo into the aux input of the mosconi.
Now, with all of that said. I need to make some stipulations. Standard audio on a CD is recorded at 44.1Mhz 16 bit audio for Red Book Standards. Anything above 16 bit is corrective up to 24 bit the oversampling in the CD mechanism rereads the disc and uses the number of bits above 16 to correct clocking errors to reproduce 20hertz to 20,000hertz.
It is funny to note that you can buy a record player that will do the exact same thing without the clocking errors. Moving on......
24bit and 32bit are DSD level recordings. Another word for DSD is SACD or Super Audio recordings. Same format. There is physically more information there to be read. These recordings have more detail, are louder, and have more impact amongst other things. Think of the difference between a DVD and BluRay. Not the same technology but you get the meaning of what I am saying.
If you have an iTunes recording, what is happening is the song is compressed using an algorithm. Most importantly, and you can see this on any digital spectra graph, is ITunes is removing a lot of information from the recording about 17K. The higher the frequency the more information. That is how a majority of the space is saved, and as we struggle to perceive above 16K let alone hear it, we perceive that there is nothing missing, and in fact our brains end up making most of the correction, especially if we have heard the song before. Want to put that to the test? Take a song that you really know the words to, turn the radio on while your going down the road, windows down, you can hear something on the radio, but cant quite make it out. So you turn up the volume figure it out and then turn it back down, Now for some reason you can clearly hear the song and can follow along with it.
Small diversion for a moment....Tuning a vehicle works the same way. You can only sit and tune a car for about 20 minutes at a time. Why? Because your brain starts to make corrections without telling you, so you end up hearing stuff that isn't there. That's why you have to get out of the car, and come back later. These people that say they stayed up all night tuning their car. BIG MISTAKE. Anyway
If you spent the money on the Oppo Dac, thinking you would improve the situation by running the iTunes stuff through it, you can, but it was a waste. What you want to use that DAC for is to take a CD, run it through the factory system, into the JL Audio Fix 82, come fiber out of that into the Oppo piece then analog out into the aux input of the mosconi piece. This would give you the absolute best sound possible.
option 2, would be come out of factory head unit into mosconi piece with factory speaker wires. Then come out of phone into Oppo piece, then to AUX input on mosconi piece. Pretty sure you could still control volume through steering wheel controls. But, you need to store songs on your phone in WAV format not ITunes format.
The magic of the TEAC player, is it is a DSD player for your phone. Most DSD converted songs are like a gigabyte in size. But, the TEAC player will take a ITunes, flac, AIFF, WAV song and upconvert to DSD while playing. I have made the argument many times that you cannot get something out of something if it was not there to begin with, but whatever the TEAC Player is doing in the conversion it make a big difference in the output. Enough to get my attention. My quest started with getting all of my music in the car. The first system I competed with had 4 12 disc changers. Today with Terabyte harddrives, and tablets the technology exist to allow me to load my music onto a portable multiterabyte drive with songs in WAV format, and control them through a Windows Tablet, coming out of the tablet into the AUX input of the Alpine head unit, thus why I picked that head unit.
another nice feature of the Mosconi piece is you can buy a Dedicated Blutooth adapter that plugs into the Mosconi processor, and can connect directly with the blutooth from the phone. It is a much better connection if you have to go wireless.
1/8 jack is analog. USB is digital.
PM me your phone number, and I will call you and I will walk you through it.