1. Home
  2. digital
  3. 1295323426

CD player vibration from CD's

I was changing a cd and noticed a strong vibration in my Oppo BD83SE cd player. I have had quite a few cd players and have never noticed this kind of vibration before. I found it was not caused by all cd's. With some, the majority, there is very little or no vibration. I am assuming the cd's in question are not round. Anyone else have this happen with your players? I am especially interested in Oppo Players but anyone feel free to chime in.
leatherneck1812

Showing 2 responses by elizabeth

elizabeth
6,726 posts
 
Over on Audio Asylum almost same question today..
The Cd can be slightly warped. Since the machine only grips a CD bt the center hole, and no support around the rest of the disc, if the center hole is not level with the rest of the disc, (warped) the disc will cause vibrations as it rotates.
The miracle here is that the lens has to be really really close to the Cd surface to read the disc, and follows the vibrating discs perfectly. Amazing!
So, if you do not want the discs to vibrate, toss the ones that do it.
Sometimes those aftermrket 'disc stabilizeers' help with this.
Also: here is a perfect 'oppo'rtunity for some tweak genius to make a device to flatten discs that vibrate.
Or, buy a Pioneer with the inverted 'stable platter' which supports the entire disc.
elizabeth
6,726 posts
 
The Cd spins so fast, and the twist in the central area so tiny, you would not be able to see it. The biggest flaw in transport technology is that the CD is held only at the inner 2mm or so of the entire disc. So that central area can be off by only a few hundreths of a millimeter, and it will vibrate, especially if the disc is also very slightly off balance.
Like I mentioned, The one disc player that had a solution to this was the Pioneer Elite "Stable Platter" where the entire disc was supported, and the disc placed into the player upside down on a CD sized turntable.
I wonder why no other manufacturers ever used that?
======
For some of the problem to be an individual players fault also makes sense, as the typical magnet clamp is pretty flimsy, and might have a manufacturing error that makes it more likely to not seat correctly. If this is the problem, opening the top up and checking the little top puck might help. The usual way it is in there the top clamp is held in a plastic holder, that only loosely/approximately lines up the spinning motor and the upper clamp. You can watch it load with the top off and see how it clamps on some of the vibrating discs. Perhaps all you need to do is push/bend the plastic holder of the top puck down a fraction of a millimeter. (I have done this)
More to discover