i did a rough/fast video with my mobile phone just for a small sound sample as heard in my room.
i used the normal channel & low input. volume was from 1 to 10 at just 1. higher volume would cause a lot of rattle in my room. bass at 3 and treble at 0. then i boosted treble at 6 and finally with the same settings i pulled back a little my tone control (halfway) on the p-bass. strings are labella flats.
the cab plays its best at higher volume (aprox 3 to 4) with some bass boost.
i want to thank you all for your advices and info!!