Why do I need power management if I have a great power cord?

I’m a power supply guy and it occurred at a show in a discussion with Nelson, who is also a power supply guy.

But whatever the minimum impedance is for your speakers, then divide the 50V rail by that impedance… and whoo-la… we get the maximum amperage that the amp can deliver to YOUR speakers.

A theoretical (or real) 1 ohm load is the only way to get 48A.
It is quite possible that he designed it to be able to push a 1-ohm load, but that has little to with what it will actually provide in a specific use case.

I, too have read about that number in reviews...

Perhaps the reviewers could be repeating what others say, or what the specs say?

If they measured it, then it gets to be more towards facts, than being more like “lore”.

It would probably be more productive to reach out to Mr. Pass for clarification as to what it means, and what it means with a a specific speaker.
(I, and likely others, would be interested in what he says… I suspect that it means he has a monster of overkill in the power supply… which is great.)

Would love to see your system, or know what’s in it. Do you use power management in anyway?

I don’t (but have a number of customers that do). My preamp employs heavy power supply regulation, which helps out immensely, and my amps employ over 35dB of feedback and are able to reject power supply noise and also employs regulated power supplies. Both also have built-in DC blockers. Equipment that lacks that sort of feedback and/or regulation needs all the help it can get.

I did rewire the audio room AC wiring, complete with Hubble AC outlets.

I’m a power supply guy and it occurred at a show in a discussion with Nelson, who is also a power supply guy.  I, too have read about that number in reviews...

OK. What is far more likely is that the 48 Amp value is actually how much current is present when the power supply of the amp is shorted. Its available to the output section in the form of charged capacitance. This is used to help reduce IMD in the output section and is not something that the output section can pass to the loudspeaker (if you see what I did there 😁).

You don't need any of it, just a complete waste of money that enriches audio dealers. 

To atmasphere: I’m puzzled by your comment that this Nelson Pass quoted 48 Amps is “how much current is present when the power supply of the amp is shorted. It’s available to the output section in the form of charged capacitance. This is used to help reduce IMD in the output section and is not something that the output section can pass to the loudspeaker.” Perhaps I failed to see what you did there; but I thought that the extended time that my tube amp can drive my speakers from the source when I turn the tube amp off (while the source is still playing) was, in fact, the capacitors discharging through the speakers. At least that was a comment I remember John Atkinson making in a Stereophile review of a tube amp that I read online. Other contributors to this forum also seem to assume that the capacitor banks are there to help the amplifier deliver transients to the speakers outside the range of their normal current demands. I’m not (yet) experienced in building amplifiers, but I am intensely interested in understanding how they work. If, as you say, the speakers are in series with the amp’s output terminals, and I never considered them that way before, but I guess they are, then they would definitely need current to drive them. Of course, your linked discussion clarifies their rather intimate relationship (you can’t have one without the other [current without voltage] if power is being produced or consumed). Further, the ‘transients’ at lower frequency, i. e., the ‘attack’ of a bass drum strike would require more power than a ‘transient’ of a high-hat cymbal strike because its relative duration would be longer. Just thinking out loud, here.

On second thought, if ‘what you were doing there,’ is saying that if the power supply is being shorted to produce 48 Amps; there isn’t going to be anything near 48 amps at the output terminals —at the same moment in time; then I totally get ‘what you did there’ —you made a joke, which this discussion sorely needs. 👍

Alternatively, if you are saying that 48 Amps cannot be used both for Intermodulation distortion AND output at the speaker terminals, then I accept that as well, as current can only be ‘consumed’ once in any circuit, I suppose.

I must be really really stupid not to understand much of these past several posts. I would hope the people commenting in such a technically proficient way would recognize that most readers have no clue what they’re saying.

There in lies a huge challenge, very very technical issues confounded buy those who don’t explain themselves very well. Very unfortunate as what they say is of value but lacks clarity.

They exhibit tremendous effort to achieve improved Sonic Quality I hope, and yet it has limited value to me because I am really really stupid I guess.

The marketing of these products can be horrible as the manufacturers don’t really do much to improve an understanding of technical information. Most dealers don’t understand all this. There have been noted exceptions along the way but still it is not explained very well.