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In Reply to: PS. Gain miust be applied before AD conversion... posted by Frank on April 28, 2004 at 05:06:39:
So what did you do exactly? You set your player to play a specific section, amplify it by 40dB (or just below clipping) and record the output from your receiver or preamp into your soundcad?Are you not recording / measuring distortion from the receiver if you do that?
Follow Ups:
Yes, you are including all the analog noise and distortion too if you capture from the player.With the Lynx you should be able to capture low sound levels with a good microphone and get raw pcm audio directly.
I used a 24/96 external usb interface M-Audio I had on loan.
I'm thinking of buying a Motu 896HD.
When I do I will put together a DVD Audio sampler with various tracks as example for various technologies. (SBM HDCD DVDA CD sacd)I also found a way to demonstrate the effect of dither.
I downrezzed a PCM recording with a bit crusher plugin to the point where bit resolution is 4 bits. By mixing in white noise through another channel before it is bitcrushed you can easily demonstrate the effect of adding dither noise.
Hey Frank,No wonder you've been so quiet :)
If you publish your tests, you should post it on this board...
With the Lynx, I was thinking of capturing through balanced inputs directly from my preamp, why would a microphone be better? (don't have mic preamps, either).
About the Motu 896HD: it looks cool, with so many inputs, I guess you can do multichannel recording and all kinds of cool stuff... but I heard their technical service is not always reliable so be careful where you buy it.
BTW, did you double-check your USB IRQs? I had some problems with that issue, and it clearly affected CE Pro (Adobe Audition) recording and playing at high resolution rates. I found that reserving one IRQ to the recording device helps a lot.
Best
Eric
You can use a microphone to capture low level sounds to test the low level sound quality of your dac. You can record familiar sounds to check if it sounds natural if you record with low gain setting.If you capture the output of a sacd or DVD Audio player you need a device with sufficient gain.
I didn't experienced problems with the usb(2) device.
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