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?

@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...

@piaudiol   👍

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.

@bruce19 

And the 4+4 (system) will result in half the power at the same level that the sole speaker at 4 ohms would have gotten

So the speaker will get 1/4 of the power, and the resistor 1/4 of the power… and the 1/4+1/4 sums to halving the power.

It may be good to try for a listening test, and cranking in and extra 6 dB on the when comparing it. But we would have to see what you get.

Mr atmaspere,

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

Thanks

I suspect (guessing here), that he does.
But…

Solely Inside of the amplifier.