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Samples from USB Turntables: Grace Digital Audio Vinylwriter (AVPUSB01
post Jan 22 2010, 08:41
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Turntable Details
Grace Digital Audio Vinylwriter (AVPUSB01S)
Street Price: $70 (US)
Ceramic Cartridge
Belt Drive
Wow and Flutter: Not published
S/N: >50dB
Platter: Plastic
Tracking force: 6.75g (Measured personally)
in turntable guide


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

All samples are FLAC and under 30 seconds.

  • 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

This is the last USB turntable with a ceramic cartridge I'm planning to test for a while. Next, I plan to move up the ladder and get samples from DJ USB turntables.

I felt it was important to demonstrate a second ceramic to show that the Crosley's poor performance was not an anomaly.

And boy do I have some poor performance to demonstrate!

I picked this turntable because several companies sell the same record player under different brand names. Grace Digital Audio, Memorex, Technical Pro, firstStreet and Innovative Technology have all claimed this USB turntable as their own.

I traced the turntable back to a Chinese manufacturer called Leetac Electronics. If you order at least 1,000 of them, you can slap your own logo on this USB turntable. I attempted to get pricing from Leetac but no one returned my e-mails.

The Grace AVPUSB01S arrived with a bent stylus and ruined my 30th anniversary presses of Aja and Dark Side of the Moon. Read about the long journey to getting a working Grace turntable in the previous post, "Proof That a Ceramic Cart Damages Record with Single Play*."

The sound quality from the Grace is predictably poor, roughly on par with the Crosley. What surprised me was how badly it skipped.

Several music tracks I played skipped at least once. But the Gorillaz track was comically bad: It finished the four minute song in a minute and 8 seconds, skipping forward on every beat.

The Crosley had trouble with the Gorillaz track as well. It's turning out to be an excellent test case. The combination of an album recorded hot and bursts of low frequencies seem to make a perfect recipe for skipping.

I had a second, new stylus, so I tried the Gorillaz track with it. Same result.

Tracks 6 9 on HFN002 play a 300Hz tone at increasing volume levels- +12dB, 14, 16 and finally +18dB. The Grace handled the 12dB fine. Anything louder and it skips to the end of the track almost immediately.

Also notable (maybe related?)- The turntable exerts a whopping 6.75 grams of vertical tracking force on the record. As mentioned in the previous post, I believe the max for this cartridge is 5 grams.

Turntable folklore would have you believe this extra force would reduce skipping- the equivalent of taping a penny to a headshell holding a gentler cartridge. The pressure didn't seem to be an asset with the Grace turntable.

After spending all this time near the bottom, I am very much looking forward to moving up the turntable food chain.

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post Jan 22 2010, 19:50
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Joined: 28-June 03
From: CA, USA
Member No.: 7426

I would also like to commend you for your superb, absolutely invaluable (and apparently indefatigable!) efforts Knowzy.
The lack of rigorous testing of USB turntables is scandalous given the resurgence in interest in vinyl.
If your testing is more widely disseminated perhaps we'll witness manufacturers producing products of acceptable quality!
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Posts in this topic
- Knowzy   Samples from USB Turntables: Grace Digital Audio Vinylwriter (AVPUSB01   Jan 22 2010, 08:41
- - Fedot L   Concerning the test disks, Ive listened only to t...   Jan 22 2010, 16:51
- - Canar   Thanks for your detailed tests, Knowzy. I always l...   Jan 22 2010, 16:57
- - Knowzy   QUOTE (Fedot L @ Jan 22 2010, 08:51) But ...   Jan 22 2010, 19:20
- - Audible!   I would also like to commend you for your superb, ...   Jan 22 2010, 19:50
|- - Arnold B. Krueger   QUOTE (Audible! @ Jan 22 2010, 13:50)...   Jan 25 2010, 13:29
- - blueacid   I am certainly glad Knowzy takes the time to do th...   Jan 23 2010, 12:09
- - Knowzy   Thanks everyone. QUOTE (blueacid @ Jan 23 20...   Jan 23 2010, 21:35
- - Arnold B. Krueger   QUOTE (Knowzy @ Jan 22 2010, 02:41) [*]LP...   Jan 25 2010, 13:22
|- - 2Bdecided   QUOTE (Arnold B. Krueger @ Jan 25 2010, 12...   Jan 25 2010, 13:32
|- - starchoice   Hi Just joined - not sure if this is best spot fo...   Feb 22 2011, 20:29
- - [JAZ]   What I don't understand is why people think th...   Feb 22 2011, 20:43
|- - starchoice   QUOTE ([JAZ] @ Feb 22 2011, 12:43...   Feb 23 2011, 20:10
|- - mixminus1   QUOTE ([JAZ] @ Feb 22 2011, 11:43...   Feb 23 2011, 20:59
|- - Arnold B. Krueger   QUOTE ([JAZ] @ Feb 22 2011, 14:43...   Feb 24 2011, 01:01
- - goofball   More here Regards, Goofball.   Apr 2 2011, 22:07
- - _komodo_   Thanks, Knowzy. I'm looking into turntables fo...   Jul 13 2011, 02:53
- - [JAZ]   QUOTE (mixminus1 @ Feb 23 2011, 21:59) No...   Jul 13 2011, 21:08
- - polemon   Can you control the USB interface on the turntable...   Oct 8 2011, 04:11
- - kraut   QUOTE This is the last USB turntable with a cerami...   Oct 9 2011, 02:35

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