Damping Factor - Interesting article

According to Pass the SIT-1 damping factor doesn’t change with frequency. The Cube is a single driver speaker, looking at the standard vertical scale at 50dB there’s a lot of axial variation from 20 -300 hz, below 100hz it looks a little strange. It’s probably bumping the bass below 100hz and above 10khz with distortion and then rolling off at about 15khz. Looks like it would sound good paired with the SIT-1 not sure DF would have anything to do with it.

The frequency and phase response is flat, distortion
harmonics are consistent in amplitude and phase relationship, and the damping factor remains the same.

@djones51  Thank you!

@david_ten asked: " Reaching out to those that know this stuff: does damping factor play a role with (influencing) perceived scale (image size)? If so, how? Thanks. " 

Not directly, to the best of my knowledge, but imo it can indirectly. 

My understanding is that low damping factor generally calls for high amounts of global negative feedback, which in turn can obscure low-level detail.  And soundstage size and depth, along with a sense of immersion or envelopment, benefit from preserving low-level detail. 

That being said I'm not an amplifier guy, but as a dealer for both types and as a speaker manufacturer and dealer, I've had a fair amount of experience in driving the same speakers with both high and low damping factor amplifiers. 

Here's another paper which examines the two paradigms of amplifier design, the constant-voltage paradigm (most solid state, generally high damping factor) and constant-power paradigm (mostly tubes, generally low damping factor).  This paper was particularly useful to me as a speaker designer: 

http://www.atma-sphere.com/Resources/Paradigms_in_Amplifier_Design.php  

Duke

@audiokinesis   Duke, Thank You. I'll reference the paper. 

1. Regarding:

My understanding is that low damping factor generally calls for high amounts of global negative feedback, which in turn can obscure low-level detail.

Is this more of a solid state amp issue?

How does it apply to tube amps with zero to very low negative feedback AND corresponding low damping factors?


2. Regarding:

I've had a fair amount of experience in driving the same speakers with both high and low damping factor amplifiers.

Your generalized findings / results?

Thanks. - David.

I can't really buy into Ralph's paper at least the terminology defined. The example of the constant power amplifier as a tube-amplifier with transformer taps, is in my mind no different from the voltage amplifier paradigm presented, the only difference is the taps on the transformer impedance match the output to what is still essentially a voltage amplifier. The output power of those amplifiers will still change as the load impedance changes, perhaps not as much as if there was more feedback to compensate for the low output impedance of the amplifier, but it will still change as it is inherently a voltage amplifier.