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16, many of those graphs are from JL and are not quite straight.
The worst graph is from VWs with Monsoon.
There are 4 OPs, F and R, L and R. All are identical.
The FR is flat above setting 15 or so on the volume knob and below that it has an auto loudness feature with a slight bass bump (around 3db at its worst, IIRC) that is hardly an issue based on Fletcher Munson hearing studies.
The S/N of ANY CD player is better than anything else in the signal chain. It's not that great in my experience, it's kind of lame for an OEM HU (low signal level), BUT it's NOT bad enough to not use - it can do quite well. While amthar used NO LOC, I tend to use a Soundgate LOCPREA or an Iso Max CL2RR if I can. (Hey! My analyzer will measure THD +N and we have an input on geeman's HU for an aux in from the sig generator! Hm...)
On the non-Bose HU, I have not had one in to RTA yet (still an open invite...). But I suspect it is not very dynamically EQd and if anything it's probably that auto loudness again.
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