REW Room EQ wizzard

Download: http://roomeqwizard.com/installers/

Support Forum: http://www.hometheatershack.com/forums/rew-forum/

Installation:

- Run the installer

- Replace open JDK java by Oracle Java, otherwise it is impossible to generate sound.

https://launchpad.net/~webupd8team/+archive/ubuntu/java

http://www.wikihow.com/Install-Oracle-Java-on-Ubuntu-Linux

http://www.oracle.com/technetwork/java/javase/downloads/index.html

Calibrating the microphone:

Umik-1 comes with a downloadable calibration file to compensate the non flat frequency response

http://www.minidsp.com/products/acoustic-measurement/umik-1

It is not possible to make reliable SPL measurements, as the microphone input level can be controlled by

the PC's sound mixer.

Also setting the microphone input level with the sound mixer is not accurate as you don't see the exact value

of the input gain, therefore it is necessary to be able to set the input gain via the command line to a well

defined value.

In linux, this can be achieved with the following command:

marc@marc-tec:~$ amixer -c 1 set Mic 10

Simple mixer control 'Mic',0

Capabilities: cvolume cswitch cswitch-joined

Capture channels: Front Left - Front Right

Limits: Capture 0 - 55

Front Left: Capture 10 [18%] [-21.00dB] [on]

Front Right: Capture 10 [18%] [-21.00dB] [on]

amixer controls the Alsa soundmixer,

-c selects the soundcard (0 = PC soundcard, 1 = Umik-1)

set Mic 10 sets the value of the microphone to 10

the output shows the values of the microphone input gain settings

In Windows there exists a tool that enables to set all kinds of parameters via the commandline nircmd

http://blog.nirsoft.net/2011/06/29/3-new-nircmd-commands-to-control-the-sound-volume-on-windows-7vista2008/

http://www.nirsoft.net/utils/nircmd2.html#using

You can download it at

http://www.nirsoft.net/utils/nircmd.zip

http://www.nirsoft.net/utils/nircmd-x64.zip

You need to set the input gain to a value that does not saturate the mic or PC input amp at the SPL you want to measure.

In order to do that:

- Generate the desired sound via REW SPL meter by clicking on Calibrate and use the speaker or subwoofer cal signal.

- Measure this sound with a calibrated SPL meter and set the volume to the desired SPL you use for testing (typically 75dB(C))

- Adjust the REW SPL reading Calibration to match the reading on the calibrated SPL meter and hit "Finished" to store this in REW.