Axiom Home Page Forums General Discussion Home Theater HT in-progress

Ok, I think, the weight of the wall pulls the top of the channel down creating a gap with-in the clips top slot. This allows the channel to slide up and down in the clip as the wall vibrates. My thinking is that the channel then whacks into the clip slot’s end and creates the metallic rattle sound. (Note: whack is my official engineering term which comes form slap’in your brother upside his head when he’s annoying you . )

Pict 1 weight of wall creates small gap at top of clip

pict 2 wall vibration causes the top of the channel to slide upward causing the rattle noise


Before moving to solve this … could it be a non-issue as:

• my hand vibration technique may be more extreme then sound vibration would be
• it's behind a sealed wall, so the rattle would not be heard
• It will be masked by the sound that created it
• It must be present at other installations of this system. If it was an issue it would have been taken care of already
  

Let’s play it safe and assume it’s a problem. To show my thinking (so you can run though this with me) the lists below state a theory and in blue my thoughts on it.

• The channel may not have enough spring to keep it fully engaged in the clip when under load. this might be the intent of the clip's design. Supporting this theory is that the channel ends which have less spring are more likely to rattle than the clips in the middle. The problem solving this is that I would have to try a different manufacture’s channel or try to bend the channel I have. Both solutions are not appealing and have risks (not to mention monetary and time impact). I'm also not really sure it's the designer intent
• The clip may be a bit rough causing chatters if the channel moves. clips look pretty smooth. Don't think this is an issue
• The whack is the main cause of the rattle. Very probable
• The slot's top curve pushes the channel back causing channel vibration. possible
• What ever the cause it's the channel's vibration you hear think this is key

Not sure I preventing the whack or movement is the way to go here. The design could be that the channel should move in the slot. I think I'll try to dampen the channels vibration and see if that works ...