Theoretical question about how CD's work

kosst_amojan
Folks, I don’t think anything more needs to be said after Geoff’s last post. How can you possibly top that list of ridiculous snake oil solutions to problems nobody has ever had?

And who cares how round the edge of the CD is? That doesn’t fix track concentricity issues. CD don’t spin on their outer edge. They spin from that hole in the middle. DUH. R

>>>>>The reason out of round CDs are bad for the sound is because they wobble and flutter during play due to their mass not being uniformly distributed. Thus, the laser servo mechanism is overloaded trying to keep the laser on the nanoscale track.

That is why a few CD manufacturers have created clamping/isolation devices for the CD wherein the vibrations from an out of round CD are greatly or completely diminished.  Even my EAR Acute has a flimsy CD tray and internal puck to hold it while it spins.  This is a basically a design error by most manufacturers in eliminating non-concentric and floppy discs.  Same with DVDs, Blu-Rays.

I just moved and set-up one of my video rooms. Yes, the IC to the receiver was high end as is the speaker wire (left overs from prior audio systems). Using an HDMI cable from an $85 blu-ray player, my CDs sound fantastic (in terms of tonality, dynamics, PRAT and imaging) using a Yamaha CR620 receiver and ADS 620 speakers. Also, 4 SR HFTs on the TV and front glass stand.  No, it doesn’t have the ambiance retrieval or bass slam (but goes down to probably 40Hz). I can’t believe how good it sounds (the room is also 18’ vaulted ceiling and about 48’ wide X 30’ deep). Even my wife commented on how good music sounds on it (it will take me some time to set up my audio rooms and I've just moved about 27,000 LPs/78s and 7,000 CDs-I never want to do that again).  So, a cheap ass blu-ray player can sound amazing. I have a collection of about 30 CD players like Denon, Sony, HK, Sharp, etc. from the 1980s and 1990s because I was so dissatisfied with the sound back then. Now, even a cheap player can sound miles better.  I might as well donate them and take the write-off.  Only a post 2000 DAC or high end CD player sounds better.