Can you clarify what you mean, please?
"Medium volume" refers to the piano's Master Volume fader?
What about the Bluetooth input level (Menu), or the output volume from the connected device?
Summing up, I think...
- master volume (on the right side of the piano) was around 80%
- bluetooth input level 50% (unchanged)
- output volume on input device (iPhone) was what I was changing
Up to around 50% on the input volume was fine, anything beyond around 70% distorted enough that even a relatively inexperienced listener like myself could not possibly miss it.
Audio level... at 50% you'd still be able to talk to each other, 70% requires raising voices to be heard, I guess? So it got around to room-filling, but not house-party loud. These are very subjective measurements, obviously.
I'm assuming that there's nothing wrong with the audio output, I just tried to use it for something it's not designed to handle. Even the deepest strings on a piano don't need to move nearly as much air as the base&drum at the intro of undisclosed desires.
I merely got curious after remembering that the capability exists and it's advertised as 2x50W (whatever that actually means), so I wanted to see what it can do.
In case anyone got curious about the specs of the speakers I own (to compare with the stated specs on the CA79 or otherwise):https://www.hifi-wiki.de/index.php/Canton_Karat_20https://www.hifi-wiki.de/index.php/Canton_CT_800