Audio Asylum Thread Printer
Get a view of an entire thread on one page
|For Sale Ads|
I created a short needle drop comparison between 2 re-pressings of the same title. I then compared the spectrum analysis for the same section of the song. Donald Byrd Fuego; 90's Japanese Toshiba on the left and 70's Black B Blue Note on the right. Captured at 24/96 and analyzed in Audacity.
What am I seeing ?
Edits: 04/19/17Follow Ups:
..these charts measure silent portions of the groove? The decible levels range from -30db to -84db. Actual signal should graph with positive decibles, I'd think.
If I'm right then I could comment further.
Those "Black B" pressings are often pretty decent. I'd like to see/hear an original pressing of that deep groove and all, and try and make some sense of it all.
The newer pressing looks like the master was digitally altered..... How it was altered, the possibilities are endless. (The "upped" response between 10 kHz and 20 kHz suggests it may have been optimized for CD playback.)
Cartridge is Shure V15-Vmr / MM
Phono stage is a Musical Fidelity A3.2 integrated amp, wide bandwidth
RIAA eq done in above
Converted by Asus Xonar U7 ADAC at 24/96
Captured by Vinyl Studio with additional EQ
Saved as a FLAC file
Viewed in Audacity without any conversion
The spectral plots are following RIAA equalization, I assume?
MM or MC cartridge? I would have assumed its unlikely to get that much ultrasonic garbage from an MM- just considering the filter formed by the cart coils and the input capacitance)
The left screen shows a sizeable spike around 18kHz and a few lesser ones above 20 kHz; these seem totally absent on the right screen. Whatever that is, it ain't music.
Too much ultrasonic energy could have an effect in some amps, causing distortion in later stages assuming that high frequency stuff gets passed through the RIAA stage without much attenuation (I'm thinking about slew-rate limitations, in the power amp).
That HF energy crept in seemingly on the vinyl itself - since the right plot looks so "well-behaved." Or am I misunderstanding something bout the nature of these plots?
Different mastering EQ and compression.
Have Fun and Enjoy the Music
"Still Working the Problem"
The Japanese pressing has more compression?
Post a Message!
This post is made possible by the generous support of people like you and our sponsors: