You can update the SX52B section. It has only been reported that the SX52B does not work in the ZA3 or V3 stereo amplifier. It has been reported that the SX52B does work correctly in the V3 mono's, ZD3 DAC, ZP3 preamp and P4 preamp. I personally am using them in both the V3 mono's and the ZP3...