Home Theater Questions? Ask a Technician for Answers ASAP
The NV-LSA40PD distribution hub is required to provide power to the amplifiers, so the rest of the system won't work without it.
If you want to install the rest of the system, yes, you do need it;
however as you indicate you can indeed power the single amplifier directly from the wall, you just need to go around switching it off and on individually when required.