Specs onboard soundcard Asus A7N8X needed

[voyager04]

I need to connect a dynamic microphone (Sennheiser MD431 II - nominal impedance 250 ohm, sensitivity (free field, no load)(1 kHz) 2mV/Pa +/- 3 dB)) to the microphone input of the onboard soundcard of the Asus A7N8X delux motherboard. Application - voice recognition.

The information that am looking for is the input sensitivity (usually indBV, millivolts or volts) and the input impedance of the soundcard. Also the wiring of the female (jack) plug (usually tip is audio, ring is bias and sleeve is ground.)

The user's manual only gives the following audio specifications:

Realtek ALC650 6CH with built-in amplifier, integrated APU (Audio processor unit) and Nvidia SoundStorm/Dolby Digital (AC-3) Encoder.

 

[Guest]

http://www.realtek.com.tw/products/products1-2.aspx?modelid=30
there is a link to the data sheet there. The problem is: it's difficult to know exactly how Asus is using this chip. There may be a few things that the data sheet can narrow down for you though.

The data sheets leave out any direct specs for sensitivity but it gives impedance and level specs.

It says the mic inputs are 16Kohm, 1.6Vrms (0dB gain) typical, 0.16Vrms (20dB gain) typical

The ADC input is 32Kohm and can have a 1Vrms typical signal applied. I don't know how many bits this ADC. If that was there then you could calculate theoretical best sensitivity.

You can see it all for yourself in the data sheet.

The real question is: with your motherboard are there mic and digitizing inputs? If so you may want to be carreful.