John, I'm curious whether this is really true...
"Better amplifiers, more refined digital section. The 4308 is larger. I bought the 4308 over the 3808 because it ad AL24 across all 7 channels."
Better amps - I don't think we know that, it has slightly higher RMS power, and even more peak output (similar to the 3806 vs. 4606). Outside of that, is the amp section and power supply truly better? What's the difference in residual noise, SNR, hum, crosstalk, etc?
More refined digital section - if your comment is tied in to the AL24 feature, then I guess you could say it's more refined. That said, there are many reviewers that believe AL24 is a negative. But more importantly, is the digital front end more linear and decode accurately? I'd also like someone to dig into the receiver as the decoder of HD codecs vs. the source.
The 4308 is larger - well I won't argue that one. But the issue is really does that larger chassis translate into better components (power supply, analog output stages). Many times that change to a larger unit does indicate that the internals are different - but it's more of a clue, not proof.
The only professional review of the 3808ci that I've seen is from the UK's HifiNews. They're looking at the 4308ci in the next issue, and they do objective testing of the units. That's going to be the first real comparison that I know of between these two units. Outside of the features, I'm waiting for someone to dig in and tell us if there are truly core differences between the two.