i appreciate the input from both of you, thanks.
while i have your attention, I'd like to ask another cable/connection question if you don't mind: hopefully this post won't be too long or confusing I'm just trying to learn what I can 
Set-up #1
I listen to music from headphones and 2 sets of speakers (1 set of desktop, 1 set unpowered through my receiver).
This is the way that I have it ALL connected. Is this the best set-up, or does it not really matter?
Macbook > Fiio e10 via USB.
e10 line out SPLIT. 1 side to desktop speakers & 1 side to the Fiio e9 line in.
e9 RCA line out to receiver tape/video in (to power other speakers).
would the splitter on the e10 DAC cause sound quality issues?
I could instead split the e9 line out, or use the e9's pre-out for the desktop speakers (but i don't like the way that sounds)
this whole things seems messy, yet sounds ok - am wondering if I'm doing it all wrong though.
Set-up #2
LASTLY, I'd like to listen to my turntable vinyl on my cans (since i'm not loving the headphone jack on the receiver).
would i split the e9 line in, and run the turntable into it - with a phono pre-amp in the middle of this connection?
something like either of these?
http://www.amazon.com/gp/product/B00025742A/ref=ox_sc_act_title_1?ie=UTF8&m=ATVPDKIKX0DER
http://www.amazon.com/gp/product/B000AJR482/ref=ox_sc_act_title_2?ie=UTF8&m=A3CLJYQ8X1E8Z4
or to simplify it all a bit and try out that tube sound i could get the HiFiman EF2A, and connect the turntable to the above pre-amp, and then into the EF2A line in.