Measurement accuracy REW.

[Johan Akerblad]

I am very pleased with the REW program but wonder what accuracy it has. Uses UMIK-1 and Bluetooth connection to the amplifier. is it e.g 0.1%, 0.5%?

 

[trobbins]

is it e.g 0.1%, 0.5%?

of what?

 

[Johan Akerblad]

Sorry for forgetting that I think of distortion figure.

 

[trobbins]

Reported distortion would be the sum of all circuitry and parts signal formats in the measurement loop. Are you using a soundcard to generate a signal (eg. WAV file) that is sent by Bluetooth and passes through an amplifier, and to a speaker, and then through UMIK-1 and back through a soundcard? All those sections of circuitry and audio interfaces and digitised signal generate distortion that end up being measured and displayed in REW.

 

[Johan Akerblad]

You are right. I use the UMIK-1 microphone and Bluetooth to send test signal to the Yamaha WXA50 amplifier. When comparing my tesresult with more professional testing it seems like I get appr. 0.4% more distortion.
I do use a laptop computer ASUS UA430. I am only trying to figure out an approximate figure and looking for knowledge from people that are more experienced than me.

 

[trobbins]

Perhaps search this forum for experience on making distortion measurements via Bluetooth - there are a few relevant threads.

 

[Johan Akerblad]

Ok, many thanks!