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Discussion Starter · #1 ·
Simple question.

Just wondering how many people have participated in a REAL ABX test. If so, what were you comparing and how did you fair? If not, why?


I'll go first:

I have participated in two tests. One compared CD vs. MP3 (256kb CBR LAME codec). To my surprise I got 16/16 trials correct I was listening to a short piece with a piano. For some reason the bass was much more prominent in the MP3. Slightly noticable at my normal listening levels, but with the sub volume turned up it was really obvious. I am curious and will probably try to set it up again and this time enocde it using as a VBR.


The next test (series of tests) I performed using a program called PCABX. Basically makes your computer a good ABX tester. Great program, anyone with a high quality HTPC should get it and play around. They offer dozens of different tests. They start out very easy (of course) and then become near impossible. I have yet to be able to hear the difference in the hardest tests. Very interesting stuff. BTW, I have a digital output from my motherboard going to my reciever and listen with headphones when I conduct the tests.


The follow-up question would be:

Do you ever conduct these tests (or at least try to make it less subjective) when you perform tweaks?
 

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Good topic and post!!!


I try to make a test less subjective if the time and effort are reasonable to me!


Often its hard to do any sort of blind test because I'm the one here all the time and my wife just ain't interested (if she knew I was demoing and might buy something I'd be trashed big time)!


Last summer, I had a few friends over, including Don of Granite Audio, one afternoon. I was demoing a Passive Audio Signal Isolator from Great Northern Sound which you connect between the analog audio outputs of my then Sony SCD-777ES SACD player to my Theta Casablanca 2. And my friends were in the blind as I switched the PASI in and out of my system.
http://www.avsforum.com/avs-vb/showt...threadid=38489

Concensus was identical to my prior subjective testing - that the PASI offered no improvement, perhaps degrading the sonics a bit in my system.


Also, as I demod the Granite Audio tube CD player later that evening with only Don, and then later that week again, I sometimes would switch inputs and just call them A and B and Don didn't know which was which, except he did as he identified each time which player sounded better, which I had subjectively determined was also the Granite Audio tube CD player on redbook CD bettering the SACD from the Sony player.
http://www.avsforum.com/avs-vb/showt...threadid=38711
 

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Discussion Starter · #3 ·
Thanks for the reply!


In case anyone is wondering and has a nice sound system hooked up to their computer (HTPC gurus, this means you) here is the link to download PCABX.

http://www.pcabx.com/program/index.htm


The site is poorly designed, took me a while to find that page the first time.

http://www.pcabx.com/product/index.htm


That link is the main page for listening tests. I recommend clicking the first link on that page (training room) to get a good grasp of how the test works and what you need to do as a listener. From there fun stuff comparing sample rates, products, and other great stuff can be compared.
 
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