How to look for room modes in REW measurements

[ZolaIII]

Understand.
So set the boost to about +2dB?!

Yes individual and let's say 3 overall max boost. Not really sure but I think those are also REW defaults.

 

[Bow_Wazoo]

Ok.
I will just stick to the order of the video and work my way through it.
Thanks.

 

[janbth]

Rooms don't form modes in only one frequency, there are many. Suggest you play a bit with the REW room simulator. Set the speakers and subs in one position, then move the MLP around. You will observe the same pattern that I described

Yes, a room has many modes, but as @theREALdotnet points out, they depend on room geometry - not speaker or listener position. They are all fixed in frequency. What you observe when you play with the REW room simulator is the effect that @theREALdotnet describes: You move out of a null of one mode and into a null of another, nearby mode.

 

[Bow_Wazoo]

You set low self filter 105 Hz Q 0.71 (Butterwort) afterwards to the A scale SPL reading from UMIK-1 in REW. It's a bass boost to mimic ISO 226 2003 loudness compensation.
You must adjust REW EQ properties correctly. Set filter tasks to Overall Max Boost 3 (or 2), Individual Max Boost 2 (or 1), Flatness 2 (or 1). I use Target settings HF Fall Slope Start 1000 (Hz) and slope 1.4 dB/octave. I don't bust low bass additionally and use ISO 226 2003 implemented loudness in JRiver.
To reference to SPL how to adjust low self filter:
View attachment 376487
If you want to try VBA and FIR (first two parts of the video):

Why did he measure left and right separately? I can also use my measurements that I made with l+r to create these FIR filters, right?

And in which programs can these filters be used?

 

[ZolaIII]

Why did he measure left and right separately? I can also use my measurements that I made with l+r to create these FIR filters, right?

And in which programs can these filters be used?

For SPL matching and alignment to start with. You simply bake L & R FIR WAV in REW and put it into convolver. As much as I know most if not all convolvers can use two chenel stereo. I use MConvolutionEZ as JRiver's built-in one has too much latency. I mentioned it more one page earlier hire.

 

[Bow_Wazoo]

What about Apo EQ?

 

[Justdafactsmaam]

Another way of looking for room modes using REW is to run test tones at various bass frequencies and move the microphone all over the room watching how much the level changes. Room modes will give you much bigger variances in level with different microphone positions and give you some great info on speaker and listening positions

 

[ZolaIII]

What about Apo EQ?

As long as it has appropriate VST plugin suport to which plugin itself is written it will work.