Originally Posted by IIDexII
Who change the cables??? YOU?
don't make me laugh.
In my proposed test you would listen to your favorite music file, ripped from a CD by me (or you) using Exact Audio Copy (creating a perfect, bit accurate file just like it appeared on the CD itself) and you listen to it through your best USB cable you think will sound the most different from a freebie USB cable, through whatever audio system you want/have access to.
This, above, is "A" in the Foorbar ABX test.
"B" is my recording of the same file after it has traveled through many
stages of (possible) degradation, including a cheapo, freebie USB cable which "colors" the sound according to people who believe they sound different.
Off the top of my head, here are all the degrading stages:
Digital sound file, "A", is played from my laptop's hard drive and exits through a USB port.
2. Digital signal travels through a cheapo, freebie USB cable to my cheapo DAC.
Digital signal gets converted to an analog signal with my cheapo ($79.99) DAC [it is actually a combination DAC, ADC, headphone amp, and a stereo XLR mic preamp unit, so I guess the DAC part, by itself, might be $20? ]
The analog signal travels out of the DAC through a 6ft (~2 meters) $1 RCA stereo wire.
The signal arrives at the analog input
of the same $79.99 combo unit so it can be re-digitized by the unit's ADC [analog to digital converter]
The now digital signal travels back to the laptop through the exact same freebie USB cable [i.e. the cable is being used heavily during the test since it is simultaneously sending and receiving data, in both directions]
The raw signal is recorded on my computer's hard drive by me pressing "start recording" and and "stop recording", by hand, and unfortunately humans like me have delay times in our response when we hit buttons [actually clicking a mouse button], plus DACs and ADCs have latency, so the recording of the song will need to have some silence before the music starts and some silence after the music ends, acting as safety buffers, so I don't miss any of the song.
The raw signal recording is retrieved from my hard drive in Audacity [DAW] editing software and the silent beginning buffer and silent ending buffer parts are cut off, precisely, so the newly created file will play in sync with the original, untouched file, "A", and the level of the new file is verified/corrected to be the same as the master source file, "A".
This new file created is "B" in the Foobar ABX test and if any of the above eight steps degrades the sound, even just a little, this will make it sound ever so slightly different (or perhaps very different) than file "A", the completely untouched master file. I contend "B" will not sound different than "A".
The two files are uploaded to Dropbox, a cloud based storage company, so you can download them for the test at your leisure. You can practice before the test by listening to the two files by whatever means you want and for however long you want. You can take however long you want to perform the test, too.
The entire creation of the test files will be filmed by me with a video camera to verify the authenticity of the files, proving they are as I claim. I will include their SHA-1 digital fingerprints for authentication purposes so you can verify the files I upload to Dropbox are indeed the ones I show in the video.
You can verify the digital fingerprint identity of the SHA-1 status of the files I upload by checking them with a verification program such as the free one here
, or whichever one you prefer.