How To Measure "Current" In An Amplifier?


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I've heard lots of times that an amplifier needs lots of "current" to drive a low impedance load.  
Is there any measurement on a spec sheet that would measure current?  
A high watts per channel amp does not necessarily mean that the amp has high current.
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mitch4t

Showing 2 responses by danvignau

I can't help but notice that you guys keep mentioning damping factor as if it were an absolute measurement. If you look up on ebay, "Audire Parlando" ( 100, 200, 360 wpc @ 8,4,2 ohms), you will find a brochure for this amp. It lists the damping factor as 1000 @ 20,000 cps, 800 @ 1000 cps, and 500 @ 10 cps.

I use a pair of slightly more powerful Audires (125 wpc @ ,8 ohms, 250 @ 4 ohms and 400 @ 2 ohms. It's damping factor is simply listed as 800.

The pair of 500 watt transformers and 8 26000 mf  filter capacitors per amp are the same, but the Parlando has a lot more output transistors, which lets it coast when my amps are working hard, but never to the point that it feels more than warm to the touch, even when just below the level to trigger the clipping indicators.

Given nearly identical designs up to the outputs, at high volumes, the Parlando is smoother. That is why I run two Fortes, to let them coast (Sometimes; The power is cool with good wine, even better with cheap wine or too much scotch.)

Any comments on either the three specs and the number of outputs as to current?

My guess is that the Parlando could put out a lot more current if it had the transformers to do so.

  


I made an error and an omission. The Audire Forte and Parlando use 4 26000 mf filter caps per channel.


Also, I want to hear about any impedence differences these designs might have. I have run B&W DM 14, 803 Series II and Acoustat electrostatic speakers,plus Peerless and 1259 subs with these amps. Only the 1259 subs did not work, maybe from lack of power; maybe impedence???