Hi Al,
I've been checking in from time to time. Actually, I've been waiting for you to post something because I always learn something from your responses.
The OP's post caught my interest because he tapped [pun intended] into a topic that you, Ralph and I posted about several years ago. Perhaps you could expound on why the OP's solid state amp would be using autoformers at all. In the usual case, solid state amps have very low output impedances. Hence, their damping factor should be high.
I think Ralph may have posted several years ago that a DF of over 8 or maybe 10 isn't all that important. In the OP's case, I am surprised that his DF isn't higher since his amp is solid state. Is there some design feature relating to the output transistors that makes the use of autoformers necessary?
Further, in the OP's case, you posted that his amp is rated at 600 watts and his speakers have a reasonable 88 db sensitivity. So what is the issue? Just curious about the use of autoformers in this application and why the OP perceives that there is a sonic difference between the 4 ohm and 8 ohm taps. I am a little surprised.
BIF
I've been checking in from time to time. Actually, I've been waiting for you to post something because I always learn something from your responses.
The OP's post caught my interest because he tapped [pun intended] into a topic that you, Ralph and I posted about several years ago. Perhaps you could expound on why the OP's solid state amp would be using autoformers at all. In the usual case, solid state amps have very low output impedances. Hence, their damping factor should be high.
I think Ralph may have posted several years ago that a DF of over 8 or maybe 10 isn't all that important. In the OP's case, I am surprised that his DF isn't higher since his amp is solid state. Is there some design feature relating to the output transistors that makes the use of autoformers necessary?
Further, in the OP's case, you posted that his amp is rated at 600 watts and his speakers have a reasonable 88 db sensitivity. So what is the issue? Just curious about the use of autoformers in this application and why the OP perceives that there is a sonic difference between the 4 ohm and 8 ohm taps. I am a little surprised.
BIF