I had a local DIY customer let me borrow an NC2K with an SMSPS3KA700 combination. In this configuration, there is no input buffer the audio goes directly into the NC2K's input.
Here are the measurements that I was able to take. Please see the legend to see what color represents what amplifier as I had measurements of multiple amplifiers that I added for comparison.
8-ohm load measurements
4-ohm load measurements
Here are the measurements that I was able to take. Please see the legend to see what color represents what amplifier as I had measurements of multiple amplifiers that I added for comparison.
8-ohm load measurements
4-ohm load measurements