The information I found below provides additional facts about this speaker connection requirement.
“The specific arrangement of connecting speakers to the Naim Supernait 3, where the left speaker cables are connected to the right side inputs and vice versa, does not inherently provide direct sonic benefits. Instead, this setup is primarily due to the design and layout of the amplifier’s rear panel, which aims to optimize space and maintain compliance with safety regulations.
Naim’s design philosophy focuses on minimizing mechanical noise and interference, which may indirectly contribute to improved sound quality. The inputs are individually decoupled and hand-wired to reduce noise, and the amplifier uses ultra-low-noise components to enhance performance. However, the specific reversal of speaker connections is more about accommodating the physical layout rather than providing a distinct audio advantage.
Overall, while the connection method itself does not offer direct benefits, the meticulous design and engineering of the Supernait 3 contribute to its overall high-quality sound performance”.