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[Ivan Beaver]

Ivan you are correct, at least on line they are rated at more than 30V/microsecond , and some models at 13V/microsecond. I had all my gear stolen in 1997, and I could swear that is what the manual said. I suspect dementia.

But to use your words, "it depends" )

I don't know how you tested the amps, but remember that when you bridge an amp, damping factor goes to 1/2 value, and also at what frequency was the number obtained.
Damping factor values at 400Hz should not be compared to a 40Hz measurements, where the cone movement has a much lower inertia, and  it is so much easier to apply the "breaks"  (damping factor) before the cone reverses direction. But then again, you already know all that.

I remember "Back in the day" that Crown was ridiculed for having such a low slew rate.

But it did  not hurt the popularity-nobody seemed to notice.

All of my tests were done single channel.

Agreed the damping factor goes in half when bridged.

That is because the output channels are in series with each other-so the "total loop resistance" is doubled-at least for the amplifier part.

[John Ferreira]

I remember "Back in the day" that Crown was ridiculed for having such a low slew rate.

But it did  not hurt the popularity-nobody seemed to notice.

All of my tests were done single channel.

Agreed the damping factor goes in half when bridged.

That is because the output channels are in series with each other-so the "total loop resistance" is doubled-at least for the amplifier part.

Technically, impedance and not just resistance.

[Ivan Beaver]

Technically, impedance and not just resistance.

I would "argue" that the output stage of an amp is probably much more resistive than inductive or capacitive. 

But I have to admit, I have never measure the phase of the output "impedance" of an amp, which would tell if it had an "impedance character".

So I could be wrong.

But I guess if the phase was even a couple of degrees off, it would be considered impedance.

[John Ferreira]

I would "argue" that the output stage of an amp is probably much more resistive than inductive or capacitive. 

But I have to admit, I have never measure the phase of the output "impedance" of an amp, which would tell if it had an "impedance character".

So I could be wrong.

But I guess if the phase was even a couple of degrees off, it would be considered impedance.

Yes, but you love the correct numbers (      ) and the amp "sees" an inductive reactive load, like a dancing moving target, and frequency dependent, plus the physical coil resistance. Since you love accuracy, when  you have inductive reaction plus resistance, it's then called impedance. But feel free to correct me.

[Ivan Beaver]

Yes, but you love the correct numbers (      ) and the amp "sees" an inductive reactive load, like a dancing moving target, and frequency dependent. Since you love accuracy, when  you have inductive reaction plus resistance, it's then called impedance. But feel free to correct me.

Yes-it depends on how things are "defined"

Since resistance is "basically" described as the opposition of flow to DC, and impedance is described as the opposition of flow to AC, then I "guess" it could be described as impedance-even if there is no reactive component in the actual value.

I am certainly not an expert in that specific regard, so could easily be wrong and would welcome correction.

[John Ferreira]

Lol! I've read here how you love the words "it depends".
I am not an expert either, and my electronics courses are ancient from 1984. I'm still learning everyday, and specially from people like you.

Like I said, I was just being technical (and picky)
Just trying to stay in context, since we are talking mostly about sound and the effect of the damping factor on bass response, we are in the realm of AC.

Your statement about DC not being affected by impedance, again, "technically", if you have a variable DC, impedance will very much be a factor.

[Jay Barracato]

My truck has a 4.11 to 1 rear differential. Can you tell me what performance I can expect?

Sent from my XT1254 using Tapatalk

[Tim McCulloch]

My truck has a 4.11 to 1 rear differential. Can you tell me what performance I can expect?

Sent from my XT1254 using Tapatalk

With how may wheels at a time, and will red paint make my truck into a sports car?  You don't want to leave out anything, Jay!

[John Ferreira]

My truck has a 4.11 to 1 rear differential. Can you tell me what performance I can expect?

Sent from my XT1254 using Tapatalk

Again it depends how much you weigh, and bigger is not better.

[Teddy Murphy]

Message me if you have any questions.  I own 4 618xlf and 8 of the 1521s as well as 8 s30. I have used them all for different applications. 

[ProSoundWeb Community]