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Pro-Ject Debut III USB Preamp Advice
Engelsstaub
post May 10 2012, 16:13
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I have the turntable mentioned in the title. I suppose it's no big news that the USB-out is sometimes too loud (no gain adjustment) with some vinyl (which results in clipping,) especially nearly every double-LP I own. Much to my dismay it also happens with a few regular ones like my mint original-pressing Black Sabbath "Mob Rules." For about 70% of my LPs it's fine, though "limited" to 16-bit resolution for recording.

My questions are these:

Would it be feasible to use something like the M-Audio Firewire Solo Amazon to record my needledrops from the preamp's RCA-outs to my Macintosh? (I'm using VinylStudio and it's pretty great IME.) If so, would I be able to effectively do so at 24-bit? (I don't imagine I hear any difference, but would like to do so for editing purposes.)

Any recommendations/good advice is greatly appreciated. (I wish I had researched this TT before I bought it. I'm considering trading it in later and getting a regular Debut III or something else in their line-up for under 800 USD...that's just not going to happen anytime really soon. I'm otherwise pleased with this TT's performance, so I wouldn't mind coming up with a good workaround. I get great results with many records and the hardware/software combingation.)

Pretty new to digitizing vinyl, so please forgive my ignorance.


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The Loudness War is over. Now it's a hopeless occupation.
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AndyH-ha
post May 11 2012, 04:55
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"it would have to be a VERY hot phono pre"

That is not the case. I've recorded about 750 albums (times some factor of LPs for all the double and triple LP albums and boxed sets, up to 10 LPs each). Except for a few large pops and clicks, nothing has ever clipped. Some albums have had maximum peaks only 0.1 or 0.2 dB below maximum, so I know the possibility exist that I will someday meet that hotter LP, but my cartridge, phono preamp, and soundcard inputs specs work together quite well. The ADC inside the TT is probably nothing special in terms of it's input specs.

However, over the past 8 years that I have been workin gwith LPs I have read a number of posts, on this and other audio forums, about people having virtually every LP they try clip -- using the same soundcard. That means either their phono cartridge put out a significantly higher signal than mine (not uncommon) and/or their phono preamp had more gain than mine.

Just to be clear, I made no recommendation for modifying anything inside the TT, only possibly exchanging the cartridge.

Using the level control of a built in soundcard to lower the recording level will not protect against clipping. Except for a microphone input gain, there are very few such controls that are not acting in the digital domain. That is, the audio is already digitized before it reached the soundcard control panel. If the analogue input level is too high, the signal is already clipped by the time the soundcard's level control gets it.

The level received by a recording program could be down 1dB or 50dB, but the audio will still be clipped. The soundcard control cannot effect that. The adjustment must be made in the analogue domain, between the phono preamp and the soundcard input. This is normally done by adding another piece of analogue equipment, not by modifying anything in the TT.

This post has been edited by AndyH-ha: May 11 2012, 04:55
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Posts in this topic
- Engelsstaub   Pro-Ject Debut III USB Preamp Advice   May 10 2012, 16:13
- - Apesbrain   Absolutely, so long as you run the TT line level o...   May 10 2012, 20:30
- - mixminus1   @Apesbrain: The OP's turntable has a preamp bu...   May 10 2012, 20:35
- - Engelsstaub   Thanks for the replies. Apesbrain: yeah, this part...   May 10 2012, 22:46
- - AndyH-ha   Clipping via the USB connection is caused by the a...   May 11 2012, 01:54
|- - Engelsstaub   QUOTE (AndyH-ha @ May 10 2012, 19:54...   May 11 2012, 03:09
- - mixminus1   No, Andy's saying that the outputs of the inte...   May 11 2012, 03:42
- - AndyH-ha   "it would have to be a VERY hot phono pre...   May 11 2012, 04:55
- - Engelsstaub   mixminus1: my Mac is a late 2010 13" MacBook ...   May 11 2012, 16:45
- - AndyH-ha   I can be of only limited help here but you should ...   May 11 2012, 20:53
- - AndyH-ha   The possibility also exist that you might not have...   May 11 2012, 20:59
- - Apesbrain   @OP, I now understand and I'm sorry for the mi...   May 11 2012, 21:06
- - Engelsstaub   Well, I do have a RCA-to1/8" cable that I use...   May 12 2012, 02:28
- - AndyH-ha   "I adjusted the volume to max out at around 9...   May 12 2012, 03:18
- - Engelsstaub   Nah, I had it turned all the way up on the Mac...   May 12 2012, 04:09
- - AndyH-ha   It seems rather strange that a recording applicati...   May 12 2012, 06:55
- - punkrockdude   What cartridge is it on the turntable? Just asking...   May 12 2012, 14:39
- - Engelsstaub   punkrockdude: it's the stock Ortofon OM5e that...   May 12 2012, 14:57
- - AndyH-ha   QUOTE I'm gathering from everything you've...   May 12 2012, 20:52
- - Engelsstaub   Alright. Thanks for your reply and your patience, ...   May 12 2012, 21:39
- - AndyH-ha   Have you determined that you get clipping using yo...   May 12 2012, 23:16
- - Engelsstaub   Yes, this and a few other records seem to clip in ...   May 13 2012, 00:18
- - Arnold B. Krueger   QUOTE (Engelsstaub @ May 10 2012, 11:13) ...   May 14 2012, 12:59
|- - Engelsstaub   QUOTE (Arnold B. Krueger @ May 14 2012, 06...   May 14 2012, 15:18
- - dhromed   QUOTE Audacity has a clipping indicator. I'm w...   May 14 2012, 15:33
- - Engelsstaub   Oh, ok, Thanks, dhromed. I think I understand how...   May 14 2012, 16:27
- - AndyH-ha   If you were looking at music that had been mastere...   May 15 2012, 03:18
- - Engelsstaub   Hey, AndyH (or anybody else reading) ...as long as...   May 15 2012, 18:05
- - AndyH-ha   According to the manufacturer's literature, th...   May 15 2012, 21:36
- - Engelsstaub   Great. Thanks for your help, Andy (and also everyo...   May 16 2012, 01:19


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