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Old 2nd April 2008, 07:02 PM   #1
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Default Aleph 3 how is power 4 ohm

In the aleph3's manual is written the peak power on 2 ohm :120 watt.
On stereophile the graphic is that an aleph3 give 32.8 on 8 ohm
55.8 on 4 ohm and 40.. on 2 ohm.
Ok but this is with a sinusoidal signal but what is the power impulsive on 2-4-8 ohm
it's because in the manual is written that the max output is 8 amp and 23 volt.
I can understand (but I know that is not so) the aleph3 give with an impulsive signal
120 watt on 2 ohm
240 watt on 4 ohm

It's impossible I know...
but what is real the power on the aleph3 in this condition?
Someone can help me?
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Old 2nd April 2008, 08:05 PM   #2
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If power is not limited by current it is voltage limited.

23x23/4=132 W.
240Watts (4 ohm) requires 31Vdc rails, which the Aleph 3 does not have.
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Old 3rd April 2008, 09:54 AM   #3
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Hi,

there is nothing like dynamic power or peak power with an Aleph. Max. power is only determined by the bias current, the current gain setting and the voltage.

There´s a spreadsheet for the Aleph where you can set these and calculate the aprox. power output into different loads. Here you can see the effects of different voltages, bias currents etc.

Can´t find it at the moment but I think it was called Aleph-power.xls or something like that.

William
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Old 3rd April 2008, 11:33 AM   #4
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Old 3rd April 2008, 04:08 PM   #5
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When the speakers have low impedance, the max current is matter.

A3 has current limit of about +/-8A. I.e. Power = (8/1.4)^2*2 = 65W. But, considering maximum reasonable distortion of 1%, the max power @2ohms could be 60W.

The service manual says 60W@2ohms.

If Stereophile say 40W@2ohms, they might have considered at a bit lower distortion level.

In the similar way considering voltage, current, impedance and the distortion level, the same manual says 60W@4ohms.


Hmm . . .
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Old 3rd April 2008, 09:33 PM   #6
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Default Re: Aleph 3 how is power 4 ohm

[QUOTE]Originally posted by saperusa
[B]In the aleph3's manual is written the peak power on 2 ohm :120 watt.
On stereophile the graphic is that an aleph3 give 32.8 on 8 ohm
55.8 on 4 ohm and 40.. on 2 ohm.

My copy of the manual is 30, 60, and 60 watts and I can tell you
that the 4 and 2 ohm figures are with some serious distortion.

I believe Stereophile evaluates the wattage at 1% THD.

And of course all of those numbers mean that you can expect a
peak of twice those values.
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Old 3rd April 2008, 11:40 PM   #7
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Thank You Mr Pass.

Sandro
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