Originally Posted by fuzzysig
the sound quality is definitely not perceived...
are you one of those people who cant tell a difference?
Holy crap, do you have to lace an insult into every response???
I never said it was "perceived" and I don't doubt you that the old one sounded much better. Most people don't go through the effort to research something if the area they are concerned about isn't real. It's good that you are now sharing information so we have some idea for what you are using, have used, and what problem you are trying to solve.
As far as amplifier quality, most 2-channels amps are going to have better internal amplifiers than any AVR just based upon logistics. That's not certain, depends on manufacturer design decisions, but likely.
In my experience, the far bigger factor for sound quality of 2-channel music out of AVR's is the digital processing
(or hopefully lack thereof) of the signal that happens before
the internal AVR amplifier. That difference in processing the signal is usually much larger than any differences in the internal amps themselves.
I have strongly disliked the sound quality of music through all of my AVR's for 2-channel music. I am including Rotel, Krell, and Sunfire AV preamps driving a McIntosh amplifier in those I disliked. It wasn't the preamp section of the Rotel/Krell/Sunfire or the McIntosh amp, but the digital processing (converting analog to digital, processing that signal, and then converting back to analog) that took every bit of expression out of music in my experience. That digital processing, as great as it is for movie content, does exactly what you describe of changing silk to newspaper for analog sources.
My guess is that your old Pioneer was operating in direct mode for your 2-channel music so that it bypassed digital processing. It could be that receiver had a different default or that pure direct mode had been switched on. What was the data source you were using on the Pioneer where you heard the huge difference? Was it an external source or streamer/DAC connected via RCA analog inputs, an external source connected via digital coax/optical, or was it internal Pioneer content/streaming? Understanding the data source and connection type is necessary to determine what is happening to the signal before
it hits the internal amp.
What is the signal source for your Teac that you like the sound of and how is it connected?
The difference between pure direct and digital processing is never subtle for 2-channel music in my experience, while the difference between the actual amplifiers themselves is usually very subtle (not nonexistent, but subtle). Equalization cannot restore what digital processing takes away from 2-channel music in my experience.