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Old 20th May 2004, 12:35 PM   #1
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Default Frequency Dependant Damping?

marshall amps, claim that they add a circuit to some of the amps, called Frequency Dependen Damping.
they claim this:

"FDD (Frequency Dependent Damping) is a radical new feature that is exclusive to Marshall Amplification and accurately mimics the way an all-valve amplifier interacts with a loudspeaker. As a result of FDD, your amp will give you a sound and feel never before thought possible in such an affordable, non-valve amp."

is this possible?
is it true?
is it simple?
can i build it?
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Old 20th May 2004, 12:51 PM   #2
dimitri is offline dimitri  United States
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>can i build it?
yes you can. This is a simple combination by voltage and current feedback (see components in red boxes).
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Old 20th May 2004, 07:59 PM   #3
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"FDD (Frequency Dependent Damping) is a radical new feature that is exclusive to Marshall Amplification and accurately mimics the way an all-valve amplifier interacts with a loudspeaker. As a result of FDD, your amp will give you a sound and feel never before thought possible in such an affordable, non-valve amp."

They are always trying to emulate tube sound, but I don't think
they ever do.
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Old 20th May 2004, 09:41 PM   #4
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I challenge that FDD is exclusively to Marshall amps. EVERY amp ever made has FDD. In every amp, damping decreases as frequency increases.
They probably thought, hey, if we can't beat it, let's make it a FEATURE!

Reminds me of that ad, where the sales manager tells his sales man, " What? They offer 360degrees dispersion? Well, we'll give them 400 degrees!"

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Old 20th May 2004, 09:57 PM   #5
SY is offline SY  United States
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Well, more than that, that resistor in series with the speaker return increases the output Z, which certainly causes "variable damping" in any speaker load that has a non-constant Z vs. frequency (i.e., 99% of all the speakers on Earth).

BTW, Jan, that new avatar looks like Diana Krall. I preferred the last one.
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Old 8th October 2015, 01:09 AM   #6
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Default Use the VST plugin?

Now that SofTubes have made a plugin of the Marshall Plexi, they could build that into a solid state amp to give it a valve sound.
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