Comments for page: RCA Dynagroove

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Posted by Steve L. December 10, 2015 - 08:19 am
Hi Bob, I appreciate the report of your issue with the Dynagroove recording and would like to understand that better. To investigate, I've ordered a copy of LSC-2947 and will listen carefully for the low frequency rumble you mentioned. In the mean time, would it be possible for you to make an MP3 file of a short interval demonstrating what you heard? If so, you can email that to me and I can post it here.

The only problem with respect to Dynagroove is that the electronic processing involved would not be expected to cause low frequency rumble unless it was present at the recording venue. It's true though, that the process did include some low frequency boost at low levels. One would think that the RCA recording engineers would have been all over rumble in the studio, since venue acoustics were a key focus of the process. Nevertheless, it appears that you've heard something and I would like to get to the bottom of it.

I haven't noticed such rumble. On the other hand, LPs generally have a significant amount of low frequency noise. That's due in part to the ~20dB of low frequency boost needed for the RIAA equalization. It's often exacerbated by the typical ~10Hz resonance found in the cartridge/tonearm system. Moreover, certain ground loop problems can lead to low frequency boost (even oscillation!) as discussed in our Switching and Grounding article here (p.4). We look forward to hearing from you and getting to the bottom of this. Thank you for your comments.

Posted by Bob December 09, 2015 - 09:47 pm
My system is nothing to get excited about, but I can hear the induced deficiencies in those Dynagroove pressings.
Case in point, LSC-2947, Beethoven's third piano concerto with Arthur Rubinstein, Erich Leinsdorf W/ the B.S.O.
There is a horrible low-frequency rumble, most notably in the quiet passages. (There are many, as I'm sure you know well.)
A fantastic performance, all but ruined by the horrible sound.
I would love to find an LP of it that doesn't suffer from the audio cancer that was Dynagroove.

Posted by Steve L. October 05, 2015 - 01:50 pm
Hi Robert, Your kind words are truly appreciated. It's nice to hear that vintage audio is getting some mainstream exposure. Your comments about why some musicians dislike streaming media are very interesting. Years ago, popular music services were running at just 128kb/s, which really isn't adequate. These days, I see that 256kb/s is common, which helps. However, at least one major streaming provider defaults to (gasp) 96kb/s. Of course, the codec used matters too...

Posted by Robert from NJ October 05, 2015 - 01:05 pm
PS- Thanks for operating this great site!

Posted by Robert from NJ October 05, 2015 - 01:02 pm
Hi Steve, Thanks for the fast reply. I appreciate the links provided. Fascinating that even a digital recording sounds better on vinyl do to more careful mastering and less compression. Also, just today (10/05/15) on NBC there was a segment on the resurgence of cassette tapes, largely fueled by modern artists that dislike the streaming that accounts for how most people get their music today. They see it as a waste of their hard work due to the low quality sound, and a short-lived event since people don't actually buy a physical, tangible item that they will keep for any length of time, such as my old LP's from the 50's and 60's!!!

Posted by Steve L. October 04, 2015 - 07:19 am
Hi Robert, There is little doubt that many or most vinyl releases today were recorded or at least stored in digital form before they were pressed. However, some newly released vinyl records are produced solely on analog equipment. Unfortunately, the SPARS code seen on CDs (e.g. ADD, DDD, etc.) isn't, to my knowledge, used on vinyl records, so it's hard to tell. Presumably though, new, all-analog records would be promoted as such, since that would require unusual workflow. Three modern-day, all-analog recordings are listed here:

Your point about whether intermediate digitization degrades the analog experience goes to the nature of the difference in sound that some believe they hear. Presumably, if digital adds something undesirable to the sound then it would be true that, once digitized, analog reproduction would not be expected to help such a recording. If instead, the difference in sound is because analog adds something desirable to the sound, then reproducing a digital recording with analog technology could provide the alleged benefits. Thank you for your comments.

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