Which is better between NC1200 vs Purifi?
Can the NC100HF be added to only nCore MP’s?
What happens to the NC100HF if the amp used on speaker that do not support bi-amp? The HF’s terminals will be blank but the amplifier will still be on. Is that a problem?
The Purifi has lower distortion than the NC1200 but the NC1200 has more output power. so which is better is hard to say. Depends on the situation. As both are considered as very fine amps it doesn't matter much I think, but I never have heard both of them. I am also not very good at detecting subtle differences between amps in general.
The NC100HF can only be added to NCxxxMP's and not to other Hypex power supplies, like the SMPS1200A400 of SMPS 1200A700 for example as used for the Purifi (A400) or other NCxxx modules.
Nothing happens as you have a NC100HF connected to a NCxxxMP and not using it for bi-amping,
BTW, I forgot something important. The latest version of the NC100HF has a reduced voltage gain. It's not 26 dB anymore but 20 dB, so 6 dB less than other hypex amps. I don't know for sure why the did it, probably to improve signal/noise ratio, but now bi-amping is less straightforward because you need the same voltage gain. Otherwise your treble level will be to low.
Maybe there is a technical solution for this but I can't tell you. Maybe companies like Nord can help you or other forum members.
Anyway, a small NC122MP module instead of the NC100HF for the tweeter, with it's own power supply, has the right gain (26 dB) but this is not as elegant or cost effective but works for sure.
John