That's not surprising because Stan Curtis was involved in the 800/900 series of Rotel amps. One of the main keys in these Rotel amps were ensuring that the power supply could dump current for breif transients in the bass guitar region. This made it really good for rock/modern music.
In fact the 820 - first design of Curtis at Rotel - really established Rotel as a budget esoteric brand, which continues through to today along side with 3020 from Nad.
I love their tight smooth sound.