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Post Your Subjective experiences for Data Base - Page 3

post #31 of 32
7/19/09 at 1:16pm
Quote:
Originally Posted by Currawong View Post
I've decided that I will at some point get an SPL meter and test some things. I seriously doubt it will change the obvious tonal differences audible between, say, OPAMPs. I might try hooking my amp back into the computer using the pre-amp outputs to see if I can measure some tonal differences though. If only I could justify an oscilloscope.
A 16 bit ADC is easily as sensitive as any sub $1000 scope. I find recording the analog outputs to be a pretty sensitive method for uncovering real differences. Generate a white noise sample and run it through a spectrum analyzer, export the analysis to a spreadsheet, this is the reference point. Burn the sample to CD or export it to whatever digital source you have.

Run the analog output back via an ADC to a PC and record it in something like Audacity, repeat 10 times to get over random variations, trim and align all 10 samples, run the recorded samples through the spectrum analyzer, export the analyses to spreadsheet average the results and compare against the reference.

repeat as necessary for chages in variables...

It is a touch tedious but the results will be pretty solid.
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post #32 of 32
7/21/09 at 3:22pm
Thread Starter 
Not a lot of data yet.

Maybe this needs to be in the "Cable" forum?

USG
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