I'm guessing that you know that you aren't arguing on point and you are afraid if you answered, you wouldn't come out on top. That's the wrong way to approach a forum like this. Talking with people in sound science isn't about winning or losing. It's about sharing information. I have information you might not have, and I invited you to share information that might show me a different side. The fact that you can't focus your argument and discuss things straightforwardly is kind of sad for you. Oh well.
We've already addressed this. You mean sounds the same on the same equipment when you say audibly transparent, I don't think I would pass an ABX test with 256 Kbps AAC, even on my best equipment - I'm not even interested in that because I just explained why it's not the full story, you didn't pick that up because you're focused on getting me in a box where you can't be challenged.
I challenged your logic on dynamic range and you ignored it - it's impossible for AAC to have as large a dynamic range as CD - that's just basic logic
I said AAC is a fantastic lossy codec, it's one of the best, go back and check.
I don't think it's reasonable to say that no one could ever tell the difference between AAC 256 and CD, yet you seem to pointing at that as if it's fact, like there is no evolution of sound systems at all.
Honestly, it seems absurd to me that while I'm trying to make the best out of the sound equipment I have, I would deliberately reduce the quality of the source material because some research said I couldn't possibly hear the difference.
The only reason I used AAC in the past is due to limitations on storage at the time.
If I'm going to audition different sound equipment, do you think it's sound science that I would reduce the digital representation to barely adequate deliberately? I would be just introducing new ways to prevent revealing flaws in my equipment.
Transparent means the same as without a sound system.
Because transparent means more than comparing just 2 sound system scenarios, it's about being able to close your eyes and see if your senses can be tricked by a sound system into feeling like it isn't there.
I don't know about you, but I've never encountered a sound system that actually did that fully - partly it's because that standard of transparent requires fooling subconscious mechanisms that are extremely good at piecing together a model of what is happening around our ears, so even if we can't verbalise what's happening and distinguish differences consciously, we can certainly tell that it's not real and that's sufficient to show that ABX is simply not enough to actually trick us.
Don't rely on ABX, rely on careful, considered listening many many times over and possibly never reaching a definite conclusion, because you can already tell it's a sound system and not real.
I don't think you're ever going to get that, your own definition of audibly transparent won't allow it.
In conclusion, I don't store files in AAC any more because I don't need to, it would be absurd to reduce the representation in any way unless it was the only way things could work.
Why not mention something about audibly transparent in case I missed it.