I think that the first thing you have to know is whether your table is currently running at the correct speed. You need to check with a KAB strobe. If it is, I think a speed box will bring relatively little. Most listeners aren't that sensitive to relative pitch, unless it's way off. However, people are more sensitive to wavering pitch, especially if you listen to a lot of solo piano and stuff with sustained chords. IMO, a speed box won't help if you have off-center records or a bad belt or whatever. It does make the motor turn at the correct speed, but it can't control the platter speed if the mechanics of the table are off. But check your table with the strobe and see where you are before doing anything.