1 Topic by Vix (edited by Vix 2021-05-06 21:47:53)

  • Vix
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Topic: RME Babyface Pro - Headphone Amp Max Power

Hi,

Could someone explain how is max power calculated? I am quite confused by these numbers.

At what load are these 50mW or 70mW produced?


Specs: Output level at 0 dBFS, 1 kOhm load: +13 dBu
(i am guessing this is measured with a 1khz sine wave)

When we convert this to Volts it is around 3.45V, which at 1kOhm can produce 12mW of power.

Does this mean that with a load of 300 Ohms it can produce 40mW?

I just can't wrap my head around these measurements.

2 Reply by MC

  • MC
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Re: RME Babyface Pro - Headphone Amp Max Power

50 mW - 200 Ohms. 70 mW - 32 Ohms. 300 Ohms will produce around 39 mW, undistorted.

Regards
Matthias Carstens
RME

MC's Website

3 Reply by Vix (edited by Vix 2021-05-07 14:27:52)

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Re: RME Babyface Pro - Headphone Amp Max Power

MC wrote:

50 mW - 200 Ohms. 70 mW - 32 Ohms. 300 Ohms will produce around 39 mW, undistorted.

Perfect, thank you.

So 1/4" out at 20 Ohms load should be able to produce around 600mW without any distortion?


Asking mostly in order to figure out if it will be able to drive Audeze LCD-X sufficiently.

LCD-X minimum power requirement is >100mW and recommended is >250mW.

Not sure if damping factor ratio is relevant for planars and if 3.5mm out should be used instead.

4 Reply by MC

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Re: RME Babyface Pro - Headphone Amp Max Power

Vix wrote:
MC wrote:

50 mW - 200 Ohms. 70 mW - 32 Ohms. 300 Ohms will produce around 39 mW, undistorted.

Perfect, thank you.

So 1/4" out at 20 Ohms load should be able to produce around 600mW without any distortion?

Not at all. That output has 10 Ohms impedance and is not intended to be used with 32 Ohms ones.

Regards
Matthias Carstens
RME

MC's Website