I think people need to relax and just plug your schiit together and enjoy the music. Rob knows what he's doing and as far as I know, the supplied BNC cables have 75 Ohm connectors (without all the plastic crap seen in 50 ohm connectors), the cable itself should be an RG59 (doesn't seem to be thick enough to be RG6), and thus I'm sure there is fantastic impedance matching between the HMS and TT2 or DAVE, and that the TT2 and DAVE are highly capable in terms of input jitter rejection.
Ultimately if the supplied BNC cables are not transmitting data bit-perfect to the TT2 or DAVE that's a different story, but I've just been using the cables supplied in the box and I am well impressed with what I hear.
If you still can't sleep at night then get yourself:
https://www.wavehighfidelity.com/storm-1/wave-storm-bnc-cable
Will this one work well for $18 USD?
Canare CACSDI6
Highlights
- 20 AWG Solid Copper Center Conductor
- 100% Aluminum Foil; 93% TAC Braid
- Foam PE Dielectric (Insulation)
- 75 Ohm Impedance
- 2.9 dB per 328 ft Attenuation at 10 MHz
- 17pF / ft Capacitance
This is a 6 ft Canare HD-SDI Cable, featuring Canare's L-4CFB RG59 coaxial cable.
- 20 AWG, solid copper center conductor
- 100% aluminum foil / 93% TAC braid shielding
- Foam PE, 1000 VAC / min dielectric
- 75 ohm
- 2.9 dB per 328 ft Attenuation at 10 MHz
- 17pF / ft capacitance