From ChatGPT:
The term "mono" comes from the Greek word "monos," meaning "single" or "one." In audio terminology, "mono" is used to describe a single audio channel, as opposed to stereo, which involves two separate channels for left and right audio.
The word "block" in this context refers to a self-contained unit or component. In the case of monoblock amplifiers, they are often designed as compact, single-channel units that can be easily installed or integrated into audio systems.
So, when these two terms are combined, "monoblock" essentially means a self-contained amplifier unit dedicated to powering a single audio channel, typically used in mono audio setups or in multi-channel systems where individual amplifiers are used for each channel to achieve higher power output or more precise control over speaker performance.
Regards,
barts