Welcome.
When you say the volume control to 2 or 3, where does it start from, zero? And what is the max, of course that would be without the speakers.
And what source does this happen with? Does it also happen with the AM or FM tuner too?
Are you the original owner of those Sansui receiver and speaker?
Have you had this issue before?
You also mention home audio setup. What else is connected to the Sansui or is there something else being connected to other component?
Perhaps the wrong input is being used hence you are over driving the preamp in that receiver?