FAQ - MathAudio Room EQ

My listening position is right in front of my mix station. I don't sit anywhere in the room other than in front of my monitors. Do you have a diagram or anything listing suggested mic placements?
You can use the following example diagram where the measurement points are shown in green color. Place the microphone at your ear height and point it at the ceiling.
Measurement points

Can I use Room EQ and Audio Hijack as a system wide equalizer on Mac?
Yes, you can. Read instructions here.

Can I use Room EQ with JRiver Media Center?
Yes, you can. Read instructions here.

Can I use Room EQ with Pure Music on Mac?
Yes, you can. Read instructions here.

Can I use Room EQ with Audirvana Plus on Mac?
Yes, you can. Read instructions here.

Can I use Room EQ with iTunes on Mac?
Yes, you can use Room EQ with all audio and video players on Mac. Read details here.

Can I objectively compare MathAudio Room EQ with other digital room correction systems in terms of amount of pre-reverberation?
Yes, you can. The method is described here.

How do I get started with MathAudio Room EQ?
Just click the "Help" button and follow the instructions. You can also find these instructions at http://mathaudio.com/room-eq.htm

Can I use my laptop for the room measurement and then simply copy the correction files to my desktop?
Yes, you can. Use the "Save preset" button to save the correction file on your laptop, then copy it to the "Documents -> MathAudio Room EQ" folder of your desktop. After that use the "Load preset" button to load the correction file.

I can only process down the frequency response to make it flat, I cannot bring the line up to counteract specific dip regions on the frequency response.
Yes, you can only cut the frequency response of your audio system. The 'cut-only' method of equalization prevents clipping. Clipping is a strong audio distortion. In the frequency domain, clipping produces strong harmonics in the high frequency range (as the clipped waveform comes closer to a square wave). The sound can be clipped if the waveform exceeds its maximum level. Any boost can produce clipping because it increases the amplitude of the waveform. The 'cut-only' method doesn't increase the amplitude of the waveform and consequently ensures the absence of clipping.

What SPL at a specific position of the mic is good for running the measurement? 
There is a simple method to set the volume of the sweep sound. Measure the frequency response of your room at a single point. Then repeat the measurement. The plots must coincide. If the plots don't coincide, the volume of the sweep sound is too small in comparison with the self-noise of your microphone, and you need to increase the volume. Too large volume is also not desirable because it causes non-linear effects in speakers and microphone. Set a minimum volume which ensures the coincidence of the plots. You don't need to change the SPL at every specific position of your microphone. The measurement program automatically takes it into account.

Can the software read ASCII (text) microphone correction files with file extensions like .sen/.mic/.cal etc. ?
Yes, Room EQ can read ASCII (text) microphone calibration files if you save them with the extension .cal, .frd or .txt. Just rename your calibration file if it has another extension.

Why do I hear a beep every 10 or 15 seconds?
There are three versions of the Room EQ plug-in: Room EQ for Foobar2000, Room EQ VST and Room EQ AU. Room EQ for Foobar2000 is free and works without any beeps. Room EQ VST and Room EQ AU are designed to be used with professional audio workstations (DAW) and they are not free (demo beeps).

Is there an easy way to "reset" the "custom curve" (green line) to a flat line after having made many changes?
Yes. Just click the "Bright" button.

The radio-button selection jumps from "Room EQ" to "Room Measurement" after loading a SNR file. How can I fix this problem?
Re-save your preset with the desired selection of the radio button.

I'm utilizing RoomEQ with foobar for my hifi playback and have lost audio output as soon as the plugin is enabled in DSP manager. The output settings are correct and audio playback returns as normal when the plugin is disabled.
Click the "Load preset" button to load the measured frequency response of your room. Then select the "Room EQ" radio button and click the "Apply" button in the DSP manager (see figure below).
button locations

My problem is that Foobar does not recognize the new calibration preset and as soon as I close the "DSP Manager" window it reverts to the first preset I entered even though I've deleted that preset. I'm sure it's a simple fix but I'm at a loss.
Click the "Apply" button in the "DSP Manager" window before closing it.

Can I use Room EQ as a system wide equalizer on Windows or Mac OS X?
Yes. If you use Windows, use VB-Audio Virtual Cable or VB-Audio HiFi Cable together with VSTHost. If you use Mac OS X, read here.

Can I use my old Mac or PC as a stand-alone Room EQ processor?
Yes, you can process the sound by means of a stand-alone Mac or PC.
Mac: Use AU version of Room EQ with free AU Lab program which can be downloaded here.
PC: Use Room EQ VST plug-in with free VSTHost program which can be downloaded from www.hermannseib.com/english/vsthost.htm
- To avoid a delay of the sound, set the ASIO mode under Devices > Wave > Output Port. If your sound card doesn't support ASIO, you can download universal ASIO driver ASIO4ALL from www.asio4all.com
- Select the Room EQ VST plug-in at File > New PlugIn.
- Check Performance > Autosave PlugIn Banks.
- Use the following button to open the Room EQ VST plug-in:

Do I need to create a filter for every sample rate?
No, you don't need to create a filter for every sample rate because Room EQ automatically changes the filter in accordance with the sample rate of the audio stream.