+1, CORRECT. Spectral amps require you to use MIT cables. Do not even think about using any other cables.
”MIT cable is specified because it ensures that the amp will see a stable load at all operating points. The reactive charactaristics of the load can cause these wideband amps to become unstable (oscillating at above-hearing-range frequencies so you don’t even know about it) until the amps’ output devices fail”.