"Arny Krueger" wrote in message
...
"Robert Morein" wrote in message
"Pooh Bear"
wrote in message ...
wrote:
As a sign of integrity from a magazine supposedly
helpful to audiophiles. Believe it or not there are
people who might actually think a Shakti stone might
acutally do something for their stereo, just like there
are people who think that damping factor is an
important specification for amplifiers.
Damping factor *is* important albeit the the typical
numbers quoted for SS amps are so high as to be beyond
worrying about from the perspective of choosing one over
another based on that parameter.
For small signal conditions, yes.
For large signal conditions, yes as well.
But have you experienced the condition where one
amplifier which is rated nearly flat to 20 Hz provides
noticeably inferior bass to another with similar specs?
Obviously you haven't reliably experienced *anything* relevant to your
claims, Robert. A lot of your strange perceptions seem to be related to
the observable fact that you hate doing listening tests where relevant
variables are maintained as stable as is reasonbly possible. For evidence
of your hatred for controlling relevant variables during amp tests,
anybody can see all your ranting and raving here ABX.
ABX is just about basic experimental controls.
In addition Robert, I seriously doubt you are controlling other relevant
parameters, momentarily putting bias controls aside. Things like level
matching and checking frequency response with real-world loads. If you
were actually monitoring these parameters, your posts would loose their
profound aroma of ignorance of real-world facts.
The reason is that damping factor is not reported for
large signals.
Don't know about that, but every time I've measured amp source impedance
at its output terminals with large signals, nothing changes appreciably
from the small signal numbers.
Hi Arny. This DF business is something that interests me in
trying top find out why amplifiers that have similar FR and
PBW perform differently into a less-than benign load.
I made up a resistive box of 4R and 12R in series, with a switch
across the 12R to short it out. I then measured the voltages
across R1 and R2 (calling them V1 and V2)
Then using the formula: (V1-V2) / ((V2/16) - (V1/4))
I calculated the output impedance Zo of the amplifiers
in which I was interested. From this, using 8 / Zo, I
could calculate the DF.
I am told that various companies measure Zo at 400Hz
700Hz or 1kHz. I got very similar figures at all these frequencies.
I also found that there was no variation with power either
which confirms what you have stated.
Iain