A New A/B Comparison Technique

[Κώστας Φ.]

"The essence of the process is this: Record the output of an audio component when playing any piece of music, or even a test signal. Then change something in the system—a cable, an amplifier, any other component, or apply an audiophile tweak of any kind. Next, record the output again with the same piece of music or the same test signal. Then, using Bill Waslo’s “Audio DiffMaker” software (which has not been commercially released yet but can be downloaded in a trial version), align the two recorded tracks to the same gain level and timing. Finally, subtract one from the other and listen to the difference recording. If it is basically silent, then the change has clearly done nothing. No sound in the difference recording means that the change has made no difference. If the track is not silent, then a difference may have been made by the change, and further investigation is warranted."

The Audio Critic

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[Κώστας Φ.]

Απάντηση: A New A/B Comparison Technique

Hi,

Just a note that Audio DiffMaker has been revised to version 1.26, and the included Help file has been rewritten and additional examples have been added. As before, Audio DiffMaker is freeware, so feel free to download it and work with it yourself. You can also use Audio DiffMaker to listen to "difference recordings" made by others, some of which are posted at the Liberty Instruments' web site.

Download from:
http://libinst.com/Audio DiffMaker.htm#DiffMaker Download

Available difference recordings ("Dyf" files) on the site are

- the effect of changing the IC type in an outboard DAC
- the effect of painting the edge of a CD with a green Sharpie pen!
- The difference between sound from using a ceramic disk capacitor and a film capacitor
- more to come, particularly if some of you send in dyf files you've made!

Audio DiffMaker is a program for demonstrating the possible effectiveness of changes (tweaks, etc.) on audio signals going through components. It works by recording the signal from audio gear before and after a change is made. The two recordings are aligned and subtracted to leave any difference (other than starting time or volume level) that may exist, and you can then listen to JUST the difference that was made. Useful for checking whether tweaks have any real effects on audio signals or whether circuit modifications are changing anything.

Audio DiffMaker is for Windows2000 or WinXP (sorry Mac and Linux users) . It is also usable with Vista, though a bit more complicated.

Also, watch for an upcoming article on Audio DiffMaker in AudioXpress magazine.

Πηγή: audiocircle.com