How do you store and catalog your vinyl?

No I’m not saying that at all. But reflection doesn’t equate to diffusion. That’s is actually why I said they act as resonators, though. Everything in the room reflects. Also, even if the CDs were stored horizontally they would still reflect. But the sound would be worse.

You can control the experiment to eliminate obvious causes like diffusion and reflection. Like covering the CDs with a thick blanket. Besides, I just gave the big secret away. Don’t tell anyone. 🤫 I said all media behaves this way, I.e., store vertically.  It doesn’t have anything to do with room acoustics, well, except for the resonator part which you can eliminate with paper sleeves.

Good points, all of which I agree with of course.

I catalog my music, vinyl, cds, sacd, DVD’s on an Excel spreadsheet on my laptop and then download it to my phone. That way I have it with me when I’m buying new vinyl. Prior to doing that I was repurchasing albums I already owned. I list them alphabetically by artist, album name, media. I store my albums alphabetically as well using the Boltz LP shelves. They are very well built, easy to add additional shelves and have sturdy wheels. I think each shelf holds 180 albums. 

Lost track but that might be the first example of cataloging on Excel which is what I initially had in mind to do.

I have a problem shelving my CD box sets such as Mercury, RCA Living Stereo and Deccas with 60 CDs per box.  Also, I have many Warner and other 15 to 40 CD box sets.  The latter box sets generally fit better in my CD rack/Can-Am metal cases as they are packed into flip type boxes which are narrow and can be more easily manipulated than the long or pull up/open boxes of Mercury, RCA and Decca.  Yikes, too many CDs in long boxes.  Same with my Elvis box sets, really long and difficult to shelve.