With the TV mount bracket I have, I can get it in 3 studs. If I need 4 studs I will need a bigger TV mount. My TV is 56 pounds and my sound bar (attached to TV) is 5 pounds. So I'm wondering if 3 studs is enough or if I need 4.
With proper anchors 3 studs are fine. One #10 wood screw penetrated 1" into cedar (the least quality of commercial lumber) will resist pull out of about 90 lbs, into most typical framing studs (with a specific gravity greater than 0.45) will hold 150 lbs.