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

@atmasphere 

Thanks for that link. My next acquisition may have to be some high impedance speakers! But tell me, can we cheat and just add a resistor in the line to a lower impedance speaker and get the same enhancement of performance from the amp?

I've read that link several times in the past.  BTW, I like your amps!

The quote came from Nelson Pass.

@piaudiol 

I've seen advertising, but not the actual quote (which IME is something very different!). Do you have a link?

But tell me, can we cheat and just add a resistor in the line to a lower impedance speaker and get the same enhancement of performance from the amp?

Yes, but the resistor will work against you than for you. It will absorb power too- for example if a 4 Ohm resistor in series with a 4 Ohm speaker, the resistor will absorb about 1/2 the power! Its not practical, and the speaker will see a vastly reduced damping factor.

Mr atmaspere,

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

Thanks

 

@atmasphere

Thanks for that link. My next acquisition may have to be some high impedance speakers! But tell me, can we cheat and just add a resistor in the line to a lower impedance speaker and get the same enhancement of performance from the amp?

@piaudiol

^No.^

I think a better test would be to add the 4 ohm resistor on the incoming power plug cable between the amp and the wall.

• At 4 ohms and 120v that limits the incoming current to 30A.
• If we assume that the spec sheet about 900W draw is correct, then we have 8A of RMS current draw.
• At 8A the voltage drop with 4 ohms is 32v, so we go from 120 (which is like 170 at the peak) down to 88v (which is really 138).
• The effect is that we significantly cut down the angular time over which the capacitors can be filled.
• I would doubt it could be heard at anything below really loud levels, but it would be interesting to try it.

The impedance difference between a 10 gauge and a say a 18 gauge feeder cable is in the milli-ohms., 4 ohms is a wildly high value.

But it is a great test to go way beyond the scope of reality to see if there is a benefit in the theory of the input cable driving the speaker.

Note: 8A at 30v drop would be a 240w so it would need to be a large resistor, or a few 100W resistors in parallel… like maybe 4x 8 ohm ones to get to 2ohms.
And a fan cooling them would be great to have. 

@bruce19 

You do you.

I keep forgetting what it is to have a "discussion" here 🙄  Here we go round in circles...