Yes, I suppose. Obviously, an amplifier from a portable radio or an IPOD woudn't suffice to drive a good sounding stereo system. I understand that boom boxes aren't going to sound as good as a decent home stereo. But for the most part it is true, if we're talking about hi fi components made for the purpose. The difference between the sound quality of the amplification in my $199 receiver and my former $5500 tube amp is trivial, as an example. The difference between my old HK CD player and a former $3500 one is zero. No difference in sound at all. The $3500 was built better but the HK is still going strong after 10 years so it is apparently built well enough. Hopefully, you get my meaning. With that addition, I'll stand by my statement.
Im always curious as to the order of importance of components. Through my countless hours of forum reading and asking persons directly, it usually comes up as this, with variations:
1. recording 2. room 3. speakers 4. source 5. preamp 6. amp 7. wires
Anyways, my limited experiences lead me to believe that there IS a difference between components, and a very audible one. My $800 cdp is so much better than my $150 universal player its not even funny. Drastic reduction of sibilance and easily improved separation of the midrange. My former $200 Onkyo has no chance in hell to drive my speakers that drop to 0.7 ohms. Trust me if I though it could, I would have saved my money. Even with my surrounds that drop to only 4ohms sound much better with a 1k amp than an entry level receiver. Better transients, less compression, more volume before clipping.
I still agree about the importance of the room however. I'd like to get a nice version of Audyssey someday in the near future to help out overhang.
I am not a big fan of the Lsi15/25 either. All due respect to mazer and Mark. I should say I never heard them on quality separates, but run through a Pioneer Elite. I thought that they were very veiled, and quite the opposite of detailed and clear. I have also once read that someone else found them to open up after a little time into the audition. I was so quickly disappointed, maybe I didn't give them enough time to "open up". I might not be a fan of that Vifa ring tweeter either. Just my opinion/experience.