Custom order options:

Option 1:Custom order replace the ACSS output by RCA outputs, price is USD10.

Option 2: Custom order higher gain model for the HE6 and low sensitivity headphones:
        The unit default had 13DB on low gain for drive the headphone which has over 95DB sensitivity, and 26DB on high gain, already enough to drive the HE6 which has around 85DB sensitivity headphones. If customer want to boost +6DB gain, in total 19DB and 32DB gain, price is USD15.

Option 3: Custom order EC version firmware built in .
        The R-27 MK2 can assemble the EC version firmware before shipping that allow the IN2 BNC input become the 75 ohm 10MHz clock input . That is free. User also can update the EC version firmware after purchase. User also can update back to the standard firmware let the IN2 back to standard BNC coaxial input.