I ended up running this stuff from the back of the receiver along the baseboard to the left corner, up the corner, back along the left wall/ceiling (to the L surround), then along the back wall to the R surround.
btw, the flash on the pics exaggerates the shadow around the casing in some places.
going up the back/left wall:
close-up:
left surround: (forgive its crappiness)

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2002 A4 1.8T 5M. 128k miles and counting
teh mod list: BW KKK K04-015, GIAC K04-FX s/w, Genesis 380cc injectors, Fast Intentions 300-cell metallic HFC, Milltek exhaust, Racetec FMIC, S4 e-codes, USP front lip retrofit w/custom RS-type mesh, Zender trunk lip, Koni FSDs + Eibach pro-kit, Neuspeed 21mm rear sway bar, Moven SP-10 wheels w/custom finish and caps, B6 S4 black/nogaro alcantara front seats, nogaro alcantara shift boot with Euro knob, AMS shortshifter, RS4 pedals, RNS-E dvd nav, IDQ 10" sub w/JBL BP-300 amp, B5 S4 front calipers, DBA 4000 slotted rotors
AIM/Gamertag: denimA4turbo