ANNEX III DETERMINATION OF SEAT REFERENCE POINT

2. DETERMINATION OF SEAT REFERENCE POINT
2.2. The seat must be set at the mid point of the range allowed for vertical adjustment, this adjustment being independent of the horizontal adjustment. For purposes of determining the microphone location referred to in section 3 of Annexes I and II, the seat must be at or as near as possible to the mid point of the horizontal adjustment range.