OK. I totally understand why you weren't impressed now.
Actually, you don't.
Without EQing each channel, the various speakers don't mesh properly. The center channel needs to be perfectly matched to the mains, or the soundstage becomes a triangle instead of a smooth left to right handoff. The same is true of the rears. You can't get a phase mesh at your listening position unless the EQ is balanced all around. That's what made it sound like sound coming from all different directions to you. The channels aren't supposed to be separate. They're supposed to seamlessly integrate with each other, creating a clear sound field. Every room requires EQing for a 5:1 setup. No living room is the same acoustic in front as it is behind. The differences in furniture placement and location of walls make that impossible.
It didn't sound like it was "coming from all different directions" to me and I didn't say that. But for the record, I have heard systems with 5 identical speakers and with speakers designed to work together and professionally EQ'ed. For music, my conclusions mostly stand. Mostly? I heard a couple of surround systems in quite large rooms where the effect (with recordings properly recorded for surround reproduction) was useful because one could sit far enough away from the sound sources (like in a concert hall, no?). But those were nowhere near domestic settings. If I ever get a house with a room the size of a ballroom or small theatre (doubtful), I might revist surround for music.
Secondly, when I'm talking about 5:1 for music, I'm talking about 2 channel recordings run through a 5:1 DSP. That accounts for 90% of my music listening. SACDs and blu-ray audio is fine, but that isn't what most people are going to listen to all the time. The 7:1/stereo DSP on my Yamaha receiver makes a bigger improvement in sound than anything else in my system.
I won't say it, it's too easy and obvious.
It takes the normal 2 channel stereo spread and adds an ambience to it that widens the soundstage, gives it three dimensional depth and fills in the rear with just enough sound to feel live, but not so much you can hear it. The ambience fills in the room and makes the sound good from any listening position, not just the main listening position.
Even with a 5:1 recording, there are multiple DSPs for processing the multichannel information. It isn't a "one size fits all" thing. Synthesized environments are *real* environments. My Yamaha has a dozen different ambiences that were taken from measurements of the acoustic in real world venues. It's not a reverb. It's a way to make the acoustics of your living room match those of a real concert hall or nightclub.
But not THE concert hall or nightclub the recording was made in. I would be more impressed if your Yamaha Receiver had thousands of different ambiences taken at most of the major venues where recordings have been made. Of course, you could just use the actual ambience of the particular hall as captured on the recording...
I have the Toscanini box set, and if you are familiar with his recordings, you know that they have been criticized for boxy flat sound. I can take them and adjust the DSPs to find a setting that completely corrects that problem. For historical recordings of classical music, it's a godsend.
They ARE boxy flat recordings because they were recorded in Mono in a studio (8H) rather than a concert hall. And that's how the Toscanini Collection sounds. My aquaintance Seth Winner, who did the original transfers for CD, did the best he could with what he had to work with. Personally, I vote for reproduction. But if it works for you, knock yourself out.
On my receiver, I have a switch called "Direct" that bypasses all the circuitry for equalization and DSPs and patches the 2 channel sound directly unaltered.
Actually, been there, done that on many dozens of surround systems.
When I flick that switch back and forth from bypass to multichannel/EQ/DSP, it's like a light bulb switching on and off. The processing provides a MASSIVE improvement. It isn't subtle, and it isn't sounds coming from all sides. Your description of what 5:1 sounds like to you isn't even close to what I experience every time I sit down to listen. The reason for that is because when you were experimenting, you didn't even scratch the surface of what 5:1 is capable of.
Hey, you like sound effects, that's fine. I like to try and reproduce the original sound as much as is practical. We just have a fundimental difference in our musical goals.