The ball I play has a meter speed rating of 3.5, and the ball apparently sets the meter speed base.
My driver and wedges have the same rating - 3.5, and deliver the slowest meter speed I get
My 3-wood has a rating of 3.0, and I get a slightly faster meter speed than my driver/wedges deliver.
My irons have a rating of 2.5, and a slightly faster meter speed than the 3-wood.