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In Reply to: Re: OK Christine, but I think you are right posted by Christine Tham on June 23, 2004 at 14:27:42:
Chris,You are correct, I plan to record at 24/96 also to be able to match your charts and measurements (and I can record the entire album that way).
The Lynx card is very good (better than any digital source I have, that's for sure), but I have this problem with unstable results which are probably related to my PC (sometimes missing samples, sometimes not, sometimes worse, etc) hopefully that should be eliminated this weekend. I had done many recordings but your research has forced me to look more carefully into the technical results, I think this is good.
Building a gain control is something i could not do myself (I dropped out of anything math very early :) but I could buy one in kit from an electronics company, I have seen those in the shops, I will look into it.
You'll get the whole thing after the weekend :)
Cheers
Eric
Follow Ups:
Sounds good. I'm currently experimenting with comparing my recordings of LPs with their CD, SACD and DVD-A equivalents, and will have some interesting results to post soon too!I would strongly encourage you to build or buy a gain control, if you can.
To give you some sort of perspective on the difference it will make, look at it purely from a resolution/dynamic range perspective.
From memory, your soundcard has a dynamic range of around 117dB. That corresponds to a resolution of around 19.5 bits - very good and pretty close to state of the art.
In contrast, my soundcard has a dynamic range of 102dB - corresponding to a resolution of 17 bits (hardly better than 16 bits!).
However, if you record at -14dB FS, you will lose the extra resolution and bring your card down to a dynamic range of 103dB - around 17 bits. In other words, by not using a gain control and not setting gain optimally, you have reduced the resolution of your sound card to the same resolution as my sound card.
So I don't agree that not using a gain control and adjusting/normalizing after the recording doesn't make a difference. (that's a triple negative!) It makes all the difference in the world.
Thanks for the explanations Christine, I didn't realize that the loss in gain is the equivalent of a loss in resolution, I should have thought of that.I'll try to catch one of those gain control thingies tomorrow.
But in case I can't, do you think using my preamp would be OK?
Cheers
Eric
if your preamp offers gain control, sure, use it - it should be okay.if you do build your own gain control, make sure you use the highest quality parts. noise is a problem with any analog circuit, and if you are not careful you could easily lower the dynamic range to 80dB or worse, in which case you are better off not using a gain control.
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