Question about output power

- Thread starter Sam21
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#### NA Blur

##### Headphoneus Supremus

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They output the same power per channel, but it could be possible that AMP A has only one channel or is mono.

It is most likely that both amps have the exact same output rating, but worded it differently.

mW is power unless you meant mV.?

It is most likely that both amps have the exact same output rating, but worded it differently.

mW is power unless you meant mV.?

#### cel4145

##### Headphoneus Supremus

Agreed. Headphone amps will typically be rated per channel as headphones are 2 channel listening devices. It's not until you get into speaker amps where people might be buying multichannel amps that have the sum potential power listed for all channels, or monoblocks which are one channel, that you would have to watch for that distinction.

#### Sam21

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I am trying to compare these two amps:

Max. output level:

> 18.8 Veff in 600 ohms = 590 mW

> 13.8 Veff in 100 ohms = 1900 mW

> 10.7 Veff in 50 ohms = 2300 mW

> 7.8 Veff in 50 ohms = 1900 mW

> 3.7 Veff in 16 ohms = 410 mW

Maximum Power, 32 ohms: 8.0W RMS per channel

Maximum Power, 50 ohms: 5.0W RMS per channel

Maximum Power, 300 ohms: 850mW RMS per channel

Maximum Power, 600 ohms: 425mW RMS per channel

The question is, which one has more power at 300 ohm and 600 ohm ?

**Lake People G109-S :**Max. output level:

> 18.8 Veff in 600 ohms = 590 mW

> 13.8 Veff in 100 ohms = 1900 mW

> 10.7 Veff in 50 ohms = 2300 mW

> 7.8 Veff in 50 ohms = 1900 mW

> 3.7 Veff in 16 ohms = 410 mW

**SCHIIT Mjolnir :**Maximum Power, 32 ohms: 8.0W RMS per channel

Maximum Power, 50 ohms: 5.0W RMS per channel

Maximum Power, 300 ohms: 850mW RMS per channel

Maximum Power, 600 ohms: 425mW RMS per channel

The question is, which one has more power at 300 ohm and 600 ohm ?

#### cel4145

##### Headphoneus Supremus

I'm not sure exactly how to compare those ratings directly.

However, doubling the power output from an amp to a set of speakers or headphones results in +3db increase in volume. A perceived doubling in volume by the listener requires around +10db more output. So, assuming the power output is rated the same (eg., RMS vs. peak), differences between wattage are not that significant unless you start getting into at least double the power.

However, doubling the power output from an amp to a set of speakers or headphones results in +3db increase in volume. A perceived doubling in volume by the listener requires around +10db more output. So, assuming the power output is rated the same (eg., RMS vs. peak), differences between wattage are not that significant unless you start getting into at least double the power.

#### NA Blur

##### Headphoneus Supremus

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I think Apex put out a simple calculator if you do a search for "Apex Amp Calculator" it should pop up.