I've spent some quality time with my SL-CT570 and have some thoughts that I need to flush from my mind so that I can listen to music in peace
. The first two observations below carried over from my old SX300, so I'm assuming that it also applies to the S650.
1. I'm guessing there's some echo/reverb going on in the Live EQ setting, in addition to the aforementioned treble boost and crossfeed. There is no dynamic compression that I can hear.
2. The Bass EQ works by diminishing higher frequencies (turn the volume up: you get more bass!). It's a wierd, flat bass -- for lack of a better description -- very uncomfortable to listen to through my TAH and 600's. The Train EQ attenuates only the treble, so by the time you reach the Live EQ, it's BRIGHT! Yechhh.
3. 10-sec lossless antishock is ever so slightly dynamically compressed compared to no antishock (NOT quieter, that's different. What I mean is that loud noises are less loud, but soft noises are also less quiet). It's still pretty good, but it definitely sounds altered if you listen closely. There might even be a frequency tilt or roll-off somewhere: I'll have to find the disc I heard this on, but I remember hearing a very slight back-to-front shift in the position of some instruments when switching between the 10-sec and no antishock settings. End result is that acoustic instruments, live recordings, etc. sound more realistic with antishock off, although the 10-sec setting is punchier. I was pretty dissappointed when I discovered this, but the fact is that the 10-sec antishock is still perfectly adequate and the compression makes some things sound better, e.g. rock/pop and not classical.
By the way, if you care at all, my theory is that the 10-sec antishock is truly lossless from the data standpoint but the analog output is changed somehow to accomodate the activation of antishock. That's the image I have in my mind, anyway. Probably total BS, but I'm not kidding about what I heard.
4. The 40-sec lossy antishock has an edgy sound which makes it the most exciting of all the other settings. Of course, it has many other failings.
Sorry for a long and partially irrelevant post. At least now that I've decided to go antishock-less, I can listen without anxiety to my system, comfortable in the knowledge that I've maxed out my system. Or have I ...?