Recent content by cimera

- Load both meassurements in REW - Click on the "All SPL" tab - Click on "Control" and then on "Trace arithmetic" - Select the meassurements you want to work with and the operation you want to apply to them - Click on "Generate" - You should see a new meassurement as a result

A "new" soundcard might not be necessary if you have some kind of onboard soundcard like most desktop PCs have but a "good" mic is some what mandatory as the the quality your EQ config is quite dependent on it. If you really need this is quiet dependent on what you want to achieve. If it is only...

As you already sayed yourself: To do SPL meassurements with REW you'll need a microphone. For reliable meassurements this mic should be calibrated to account for the mics frequency response. This also must be connected to you PC in a way (most likely via mic input of your sound card). From what...

Not done this but some thoughts of mine: - You have to take multiple meassurements (without headphone, with headphone but without ANC, with headphone and ANC) to be able to distinguish between the effects of active and passive NC - The result might be dependent on the position and angle of the...

@John Mulcahy That would be a solution. I didn't know that the sound card cal isn't used in case of impedance meassurement. Thank you! @sm52 As it's only -1.6 dB@20 Hz I would say this is mostly flat but in the same ballpark as the frequency responce of the sound card (which is calibrated out)...

Hi sm52, yes that is how I understand it too. But from my understanding the frequency response (and phase response) of the mic pre amp should be calibrated out of the meassurment to have a accurate meassurement or am I wrong? If the mic pre amp is not calibrated out the resulting measurement...

I think this is not what I mean. With the measurement box you are using the same input of the sound card for spl measurements and impedance measurements. In case of spl measurements there is an external mic preamp (not part of the audio interface) in the signal path. In case of impedance...

When using REW with a measurement box to switch between spl and impedance setup it would be helpful to have the option to add a calibration for the necessary external mic preamp in addition to the mic cal file only in case of spl measurements. From my understanding at the moment you whoul have...