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Samples from USB Turntables: Audio-Technica AT-LP2D-USB
Knowzy
post Feb 18 2009, 08:22
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Turntable Details
Audio-Technica AT-LP2D-USB
Street Price: $100 (US)
AT3600L Moving Magnet Cartridge
Belt Drive
Fully Automatic
Wow and Flutter: <0.25% (WRMS)
S/N: 50dB unweighted
Platter: Aluminum
Tracking force: 4.54g (Measured personally)
More in turntable guide


Photos











The Sample Clips
For background on the clips, see the "Preparation" thread.

All samples are FLAC and under 30 seconds.
Music
  • CD LP Peg, Steely Dan, Aja
  • CD LP On the Run, Pink Floyd, Dark Side of the Moon
  • CD LP Dare, Gorillaz, Demon Days
  • CD LP Dum Diddly, The Black Eyed Peas, Monkey Business
  • CD LP Rhiannon, Fleetwood Mac, Self-titled Album (Dusty, scratched and skipping album)

Test Tracks


I eagerly await your opinions and analysis on the samples.


This post has been edited by Knowzy: Apr 23 2009, 22:09
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Axon
post Feb 21 2009, 23:58
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Those are pretty, but they're not remotely resolving enough. 99% of that wave might be due to the pressing being off-center - that will be easy to spot if all the other turntables show the same thing. Most of the width of the spectrogram is due to FM sidebands which distract from the carrier wave. Measurable flutter (that we care about) can extend well into the 200-300hz range and beyond. Your frequency and time resolution should both be at least a hundred times more greater to get useful results, and that level of detail is simply impossible with spectrograms.

The reference for interpreting wow/flutter is Poul Ladegaard's legendary 1977 paper on mechanical resonances. Specifically look at Fig. 18 on page 7. Those are the sorts of charts you ought to be displaying/interpreting.

The "right" thing to do here is demodulation of the 3150hz tone into a wow/flutter signal followed by DC removal and amplitude spectrum. Don't spend much time playing with the spectrograms for any kind of analytical use - they're good for visualization but not for analysis. I've been meaning to cook up a good quadrature demodulation program for some time, and now is the perfect time.

This post has been edited by Axon: Feb 22 2009, 03:19
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Posts in this topic
- Knowzy   Samples from USB Turntables: Audio-Technica AT-LP2D-USB   Feb 18 2009, 08:22
- - donnie   The 1 kHz test sample and Dum Diddly (LP) don...   Feb 18 2009, 10:32
- - Axon   Also the links for the Gorillaz and Black Eyed Pea...   Feb 18 2009, 16:34
- - Axon   Hey: I looked at one of your close-up pics and tha...   Feb 18 2009, 16:47
|- - krabapple   QUOTE (Axon @ Feb 18 2009, 10:47) Hey: I ...   Feb 18 2009, 18:29
|- - tiptoe   QUOTE (Axon @ Feb 18 2009, 11:47) Hey: I ...   May 15 2009, 16:54
- - Axon   Bad news, krab... they're already level-matche...   Feb 18 2009, 19:12
|- - krabapple   QUOTE (Axon @ Feb 18 2009, 13:12) Bad new...   Feb 19 2009, 16:49
|- - Axon   QUOTE (krabapple @ Feb 19 2009, 09:49) ED...   Feb 19 2009, 20:37
- - Knowzy   QUOTE (donnie @ Feb 18 2009, 01:32) The 1...   Feb 18 2009, 19:28
|- - krabapple   QUOTE (Knowzy @ Feb 18 2009, 13:28) That ...   Feb 19 2009, 16:59
|- - Axon   QUOTE (krabapple @ Feb 19 2009, 09:59) QU...   Feb 19 2009, 17:54
- - Axon   I only own Aja on LP, not CD. On The Run is a bett...   Feb 18 2009, 19:34
- - Axon   New pics up for Pink Floyd and Steely Dan samples,...   Feb 19 2009, 17:49
- - Axon   I'd also like to point out that even though an...   Feb 19 2009, 20:36
- - Knowzy   QUOTE (Axon @ Feb 18 2009, 10:34) Magic E...   Feb 20 2009, 05:27
|- - Axon   QUOTE (Knowzy @ Feb 19 2009, 22:27) I did...   Feb 20 2009, 05:53
- - Knowzy   QUOTE (Axon @ Feb 19 2009, 20:53) QUOTE (...   Feb 20 2009, 06:28
- - Axon   Don't deal with the server - put up a tracker ...   Feb 20 2009, 08:36
- - Knowzy   The Ultimate Test LP FLACs are up. See the origina...   Feb 20 2009, 21:34
- - Axon   Yeah that was a sucky mastering decision with HFNR...   Feb 20 2009, 21:57
- - Knowzy   I ran the Wow & Flutter test tone through Spec...   Feb 21 2009, 02:14
- - Axon   Those are pretty, but they're not remotely res...   Feb 21 2009, 23:58
- - Knowzy   The Hi-Fi News FLACs are up. QUOTE (Axon @ F...   Feb 22 2009, 04:30
- - Knowzy   The last sample is up: Fleetwood Mac's Rhianno...   Feb 23 2009, 00:34
- - Knowzy   I told you the LP was dusty... After Playing E...   Feb 23 2009, 01:06
- - Axon   Fun times. I told you to get a carbon brush That...   Feb 23 2009, 01:10
- - Knowzy   QUOTE (Axon @ Feb 22 2009, 16:10) That...   Feb 23 2009, 07:29
- - Axon   Just a status update - I got most of the demodulat...   Feb 26 2009, 01:22
|- - Arnold B. Krueger   QUOTE (Axon @ Feb 25 2009, 19:22) Just a ...   Feb 26 2009, 14:18
- - Axon   Thanks for the cheerleading. Demodulating AM is tr...   Feb 26 2009, 21:29
|- - Knowzy   QUOTE (Axon @ Feb 26 2009, 12:29) Thanks ...   Feb 27 2009, 06:54
|- - Arnold B. Krueger   QUOTE (Axon @ Feb 26 2009, 15:29) Thanks ...   Feb 27 2009, 14:15
- - Axon   Post is up: http://www.hydrogenaudio.org/forums/i...   Feb 28 2009, 14:29
- - Knowzy   Strange- I didn't get a reply notification whe...   Jun 9 2009, 23:07


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