It's far worse when pro audio equipment is used- it's not about pro power, it's about the pro audio source's signal, which is very different from what comes from a typical audio device. Anyone who has plugged an electric guitar into the mic input of a stereo with one or a tape deck knows that it doesn't sound anything like an electric guitar plugged into a guitar amp- this is because a guitar amp doesn't need flat frequency response or 20-20KHz response and most of a guitar's sound is between >100HZ and >5KHz, if even that wide of a response range.
Depending on the pro amp, it might have binding posts, 1/4" jacks or SpeakOn jacks, which can also be used with 1/4" jacks. Commercial amplifiers often have Euro-style connections, also known as Phoenix Connectors because the pro/commercial equipment integration industry doesn't give a rat's butt about fancy cable BS, unicorns and stories about how special the cables are, even when someone who's well-known says they deliver chocolaty midrange.