One Systems PM4-M V4 User Manual
Page 9
FIGURE 5
UNDER NO CIRCUMSTANCES SHOULD THE LOUDSPEAKER DOWN TILT
EXCEED 35 DEGREES FROM VERTICAL!
4. Now the Link must be installed.
INSTALLING THE PM4-M WITHOUT THE LINK IS NOT ALLOWED!
The Link (see figure 3) consists of a stainless steel quick links, a stainless steel
turnbuckle, and several links of stainless steel chain.
DO NOT SUBSTITUTE ANY PART OF THIS LINK ASSEMBLY!
The Link should be tightened by rotating the turnbuckle until there is very slight
tension on the Link assembly. Do not over tighten. The purpose of the Link is to
provide support for the main PM4/M tilting bracket at the bottom of the assembly.
ONLY VERY SLIGHT TENSION SHOULD BE APPLIED WITH THE
TURNBUCKLE!
Warning: If the turnbuckle assembly is turned and the loudspeaker enclosure
angle begins to change (if the down tilt angle begins to move toward 0 degrees
vertical) then the turnbuckle has been OVER TIGHTENED. Turn the turnbuckle
until there is VERY slight tension on the Link assembly and the down tilt of the
enclosure is set by the tilt bolts on the PM4-M.
Make sure to use the appropriate combination of Link parts to insure proper
connection between the PM4/M and the specific One Systems enclosure. The
required combination of Link parts is determined by the down tilt angle of the
enclosure, but the turnbuckle must always be used.