On 10/26/2013 10:57 PM, Grant Saviers wrote:
You're the audio expert, but didn't Bob Carver figure out some clever
variable supply voltage tricks with his big Sunfire amps? I have two
and my "Signature" stereo is rated 2 to 16 ohms (1250w/ch 4 ohms) and
runs stone cold even when delivering big power. No other amp I've
tried had the headroom needed for my B&W 801Fs to generate max
orchestral peaks at concert hall levels.
So isn't what you are suggesting been done before in the audio domain?
For at least four decades, solid state audio power amps have been
contstant voltage sources with VERY low output Z (typically 0.1 ohms or
less) , so the voltage is constant with load Z, and power out increases
as load Z decreases (P=I squared R, or E squared /R))
There are good reasons for this -- the low output Z of the amp damps
mechanical oscillation in the loudspeaker to clean up the sound (so that
the bass isn't "floppy." The "damping factor" is the ratio of the
nominal loudspeaker Z to the amp output Z (plus the resistance of the
loudspeaker cable) . The loudspeaker Z is a a very complex function,
with a dip in the midrange of each driver, rises above that point due to
inductnace of the equivalent circuit, and at low frequencies, encounters
resonances with the physical structure of the loudspeaker driver and
addition resonances of the loudspeaker enclosure. In other words, it
ain't simple. :) The nominal Z of a loudspeaker is the minimum value
of Z in the midrange.
I am not familiar with Bob Carver's work, so cannot comment. Bob worked
primarily in home systems, and I worked in pro systems.
73, Jim K9YC
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