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Power consumption- audio amps.

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Old 30th September 2009, 02:16 PM
 
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Power consumption- audio amps.


Hello all,
I have the following questions on Power consumption of Audio systems

1. If an amp says takes 200Watts ( not the audio output), that means, the moment I turn it ON< then my power meter start running with 200 watt load on it?

2. Any volume level, does the amp consumes the same mains power?

3. Or if the power consumption depends on the speakers connected and the volume level?

In short, after listening some beautiful songs, will I get fainted by power bill?

Please educate me.
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Old 30th September 2009, 03:10 PM
 
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Re: Power consumption- audio amps.

That means the new Marantz, NAD, CA , HK amps will draw nominal (<100)? And 30-35Watts it idle means with signal it increase upto say 100W?
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  #3  
Old 30th September 2009, 03:53 PM
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Re: Power consumption- audio amps.

Quote:
Originally Posted by anandkrishnantc View Post
Hello all,
I have the following questions on Power consumption of Audio systems

1. If an amp says takes 200Watts ( not the audio output), that means, the moment I turn it ON< then my power meter start running with 200 watt load on it?

2. Any volume level, does the amp consumes the same mains power?

3. Or if the power consumption depends on the speakers connected and the volume level?

In short, after listening some beautiful songs, will I get fainted by power bill?

Please educate me.
Cranky has already answered most of your queries.

Generally when consumption is mentioned it also mentions AT FULL LOAD/AT WHAT IMPEDANCE. Eq Bryston states 1280 at max output @ 8 ohms. In this particular example the amp can draw about 2500 W if a 4 ohm load is connected.
So if ur amp says 200W then u are NEVER going to be able to use it at MAX power and hence will never consume 200W so go listen to all your beautiful songs and i promise u there will be no shocker of a power bill.
Rgds
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Old 8th October 2009, 12:51 AM
 
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Re: Power consumption- audio amps.

Hi Cranky and Dinyaar ,

I have one more question ,. Say i am using a Class A Amplifier which says 1500 power consumption, does it mean that when i switch on the amplifier and start playing the power consumed by the amp will be 1500watts? or even for Class A the power consumption of 1500 watts is only at max volume?

Vijay
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Old 8th October 2009, 07:30 AM
 
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Re: Power consumption- audio amps.

Quote:
Originally Posted by dali View Post
Hi Cranky and Dinyaar ,

I have one more question ,. Say i am using a Class A Amplifier which says 1500 power consumption, does it mean that when i switch on the amplifier and start playing the power consumed by the amp will be 1500watts? or even for Class A the power consumption of 1500 watts is only at max volume?

Vijay
You are referring to 2 different things in your question. One is output voltage that is applied to the speakers and the other the output power. Basically power consumption of a class A amplfier is not related to its output voltage. What this means is that the amp will be consuming same power whether you are passing signals or not from the time its switched on. This is the reason they are considered as low efficient devices.

Also the ratings at the back of the amp (which I think you are suggesting with the 1500 watts) is the amount of power the amplifier requires for the power outlet for normal operation (no clipping or distortion) when played at full volume. This is a classic way that manufacturers mislead buyers.
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Old 8th October 2009, 07:41 AM
 
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Re: Power consumption- audio amps.

Quote:
Originally Posted by dali View Post
Hi Cranky and Dinyaar ,

I have one more question ,. Say i am using a Class A Amplifier which says 1500 power consumption, does it mean that when i switch on the amplifier and start playing the power consumed by the amp will be 1500watts? or even for Class A the power consumption of 1500 watts is only at max volume?

Vijay
For a typical pre class A amplifier (not one that switches from A to AB) the power consumption is pretty much at max all the time. In that sense I doubt whether your amp is pure class A. This means it needs to be around 200W per channel class A.
cheers
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Old 8th October 2009, 12:10 PM
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Re: Power consumption- audio amps.

Quote:
Originally Posted by dali View Post
Hi Cranky and Dinyaar ,

I have one more question ,. Say i am using a Class A Amplifier which says 1500 power consumption, does it mean that when i switch on the amplifier and start playing the power consumed by the amp will be 1500watts? or even for Class A the power consumption of 1500 watts is only at max volume?

Vijay
Yes it draws power even without input signal as the device is always conducting. Highly inefficient designs.
Rgds
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Old 8th October 2009, 12:22 PM
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Re: Power consumption- audio amps.

Quote:
Originally Posted by dali View Post
Hi Cranky and Dinyaar ,

I have one more question ,. Say i am using a Class A Amplifier which says 1500 power consumption, does it mean that when i switch on the amplifier and start playing the power consumed by the amp will be 1500watts? or even for Class A the power consumption of 1500 watts is only at max volume?

Vijay
Answers have already been provided. But I have one comment: has anybody seen a pure class A amp with 1500W power consumption? I have not heard of any. They usually are delivered with much less than 100Wpc rms and the power consumption, according to my rule of thumb, would be approximately less than 5 times the rms power. But yes, they draw the whole power, all the time.

Regards.
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Old 8th October 2009, 12:51 PM
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Re: Power consumption- audio amps.

Quote:
Originally Posted by Asit View Post
Answers have already been provided. But I have one comment: has anybody seen a pure class A amp with 1500W power consumption? I have not heard of any. They usually are delivered with much less than 100Wpc rms and the power consumption, according to my rule of thumb, would be approximately less than 5 times the rms power. But yes, they draw the whole power, all the time.

Regards.
I guess as they are so inefficient they are relatively small in output. I have the Accuphase catalogue and the small E 550 which is 30WPC @ 8 ohms consumes about 280W and the classic (brilliant) A60 power amp (60 WPC@ 8Ohms) consumes about 550W.
Funnily they mention about half the consumption on idle!!! Most other Class A that i have read about operate at full power rating all the time.
Rgds
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Old 8th October 2009, 01:05 PM
 
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Re: Power consumption- audio amps.

Thank you every one for the help.I do not have a Class A Amplifier which draws 1500watts , thinking of upgrading to a Class A amplifier which is around 100watts RMS. Any idea how much current a 100watts Class A amplifier will consume.

Vijay


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