Flaws in this chain?

I use an Apple TV in my system and I can't tell the difference between it and an Airport Express, which does not resample my signal.  When I plug in my laptop directly to the DAC it still sounds the same to me.  Of course, I am limited to 16/44.1, but unless I am using headphones I can't really tell the difference between the set ups.  So I leave the Apple TV in the system and have moved on to other things.

As far as hi-res, I struggle to find a difference between it and 16/44.1.  Now I CAN hear the difference in mastering, and a lot of the hi-res music out there has been re-mastered, and it does sound better, but the same remastered hi-res files sound just as good (to me) when downsampled in my system to 16/44.1.

As far as jitter goes, I have yet to figure out what that sounds like.  I've run directly from my MacBook Pro into a Benchmark DAC 3, and it sounds the same to me as when I run the same DAC using an Airport Express (didn't have the Apple TV for comparison).  Still using 16/44.1 files, maybe it is a hi-res thing.  I dunno.  I figure if I can't hear it, it's not worth going down that rabbit hole.  I probably need better equipment if I really want to hear jitter.

Apple TV>Schiit BiFrost MB>Odyssey Candela>Odyssey Khartego>Harbeth P3esr.  Groneberg interconnects, Kimber 4TC speaker cables.

AEX>Schiit Modi MB>Schiit Vali>Sennheiser 650 headphones.  Also run Grado 325e headphones with Little Dot 1+ (that combo is a blast)!

kahlenz I think you hit the nail on the head from everything I have read about jitter on engineering and pro audio sites it's another blown out of proportion worry any jitter produced is outside the audible range and if you are using a well built dac no need to concern yourself with it. 

listen to the wind blow, down comes the night
running in the shadows,  damn the DAC damn the interconnects
break the silence, 

Yes, jitter was the #1 issue which is why I'm glad they have figured it out in well designed modern dacs that have been made in the last 20 years or so.  Actually longer than that but I believe dacs have improved in the last number of years but that's just a belief if I had to pick a well designed dac from the 80's from a newer one in a blind test I doubt I could. I have listened to files that have jitter in them which can be found at various sites like hydrogen audio, AES etc.. and I have never heard jitter in my system.  So if I don't hear it, I don't worry about it.