Yes, this is my website. And yes, I am 100% sure: there is no dithering applied. Actually, I did apply dithering first, but the fade out (at the end of the extract) would then fade out into audible noise (with or without shaping). So, it would have been very easy for people to find out which was the 8bit version, by simply listening to the fade out. That's what I wanted to avoid and why I removed the dithering.
I am very aware of what dithering does and how it works. BTW, I wrote the following page, providing audio examples and audible tests:
It shows how dithering, applied to an 8-bit file, increases the dynamic range by 18dB!
Thanks for confirming. I also took a look at the other page. Yeah, fading into audible noise would be more obvious i guess, I was just suprised by how inaudible the quantization noise was in the tracks.
It's an interesting website so thanks, I'm curious to know how many people can tell pass the abx test using those tracks though.