Alright Kids. Here is Part 1 of the Test. In addition to installing the new Lynx card, I upgraded to Windows XP (I've been using 98SE for the longest time). Long story short, I'm still working out the kinks in my system. One of my biggest problems is the PACE copy protection for my Waves plugins. It seems to be causing major issues with a few of my audio programs after the OS install. Logic (my main sequencer and audio workhorse) couldn't open until tonight. So Chessrock's test of doing several tracks of the same mix though both converters cannot be done until I resolve this issue.
What I have done is this:
1. I set up ~30 second snippets of some commercial mixes (Brandy, Dixie Chicks, Susana Baca, Les Nubiennes, Tool, Usher). Each of these mixes are radically different and will reveal different aspects of this test. I set the files up as
a montage in Wavelab, played them through Wavelab and recorded them into Sound Forge.
2. For the Lynx converters, I just plugged the output of the Lynx card into on of the inputs and recorded that. For the Delta 66, I plugged the Lynx output into the Delta's input. I used a Neutrix adapter/transformer (xlr to 1/4 inch), because the Delta uses 1/4 inch TRS inputs rather than XLR.
2a. I don't think the Neutrix adapter is an issue, because it's Neutrix brand (used on the better cables).
3. Each file was recorded at 24 bit 96 kHz (into Sound Forge) to make sure I got all the high frequency info ... just so the sample rate would not be the issue for any changes in the converters.
4. I tried to encode the 24/96 file as an mp3 at 320 kbps (the highest mp3 rate), but alas no dice. Neither Wavelab (3.0) or Sound Forge 5.0 could deal with this. They both crapped out several times.
4a. I was however able to encode the files at 320 kbps AFTER I downsampled the files to 48 kHz first. I did this in Wavelab and I don't think it's an issue, because the sample rate conversion was a simple one (divide by 2) and because this was done to all of the files... forgot to tell ya that I upsampled the master file to 96 kHz prior to recording. (no change to the file, but necessary for system compatibility in order to record the subsequent file at 96 kHz)
5. What you hear is the product of an mp3 encode of 320 kbps. It's not the actual wave file, BUT it's pretty close and much of the difference between the two converters can still be heard. I'll refrain from expressing my observations untill some responses ensue so I won't color the discussion. Part II of the test (with an existing mix will come later when I get my system issues resolved).
There are three files: 1) The Master file (ripped directly from the CDs), 2) The Lynx II file, and 3) the Delta 66 file. Let the discussion fly. Sorry so long ... progress is tough at times
Sorry Guys, I was under the impression that I could attach mp3s to the post. I have to find some free webspace. I'll let you know the link when I get it.
