If the noise floor is low enough 57 db might be fine.
But the phono gain isn't the whole thing. The gain in the line section, the gain in the amp and finally the efficiency of the loudspeakers all make a difference!
So if you have 57 db, a passive volume control and 89db speaker it won't work in most cases. So you need to add up the gain in the electronics and see if that will give you enough sound pressure.
But the phono gain isn't the whole thing. The gain in the line section, the gain in the amp and finally the efficiency of the loudspeakers all make a difference!
So if you have 57 db, a passive volume control and 89db speaker it won't work in most cases. So you need to add up the gain in the electronics and see if that will give you enough sound pressure.