Assess whether amplifiers sound the same? That's not what I'm assessing. I assess which amplifier achieves greater suspension of disbelief and sounds more natural and convincing.
Yes, we get strong smearing. I also own ESL 63 - a completely different sound perspective.
My point is that the way we look at surfaces depends on conditions. For example, we need a significant distance between the sound source and the diffusor before it starts working as a diffusor. In small rooms diffusors do not act as diffusors.
Yes .. depending on frequency of course
I am not a fan of diffusers or absorbers at first reflection points because they mess up phase.
I think distance is the best option .. followed by redirection