Charlie,
The AKSA has a gain of almost 32dB, which is high by amplifier standards, but set deliberately high to enable use with just about any source. Normally we would be concerned with keeping noise down, but on the AKSA this is never a problem, so I decided to go for utility, to permit use with lossy passive preamps.
I know neither the Meta42, nor the CMOY preamp. However, if the gain of the AKSA is too high, it can be reduced with no cost to sonics by replacing R9 with say 3K3 or 4K7.
As long as you have the volume turned low at the outset, there is little chance of damaging the AKSA with high inputs.
Cheers,
Hugh