Minidsp 2x4 hd vs avg meassurement

[Thomas Larsen]

Hi saw on minidsp homepage that their tutorials has changed regarding REW and subwoofer meassurements. They recommend that you meassure more e.g. 3 positions and then use the avg. response for yor EQ. How many use that ? I always only use one position in the MLP and eq that.
The multi position thing is kind of the audyssey way of doing.
Pros / cons of both ?

 

[Wayne A. Pflughaupt]

I’m a MLP-only guy for manual EQ. After that, I personally I’ve always found the SQ perfectly acceptable in other locations – can’t tell a difference at any seat on the couch, even though they all measure a bit different.

Never have used Audyssey.

Regards,
Wayne

 

[JStewart]

Makes sense as the sub response can change a bit even just a few inches away.
There’s also the “moving mic method” of measuring a response to eq.

 

[sam_adams]

Hi saw on minidsp homepage that their tutorials has changed regarding REW and subwoofer meassurements. They recommend that you meassure more e.g. 3 positions and then use the avg. response for yor EQ. How many use that ? I always only use one position in the MLP and eq that.
The multi position thing is kind of the audyssey way of doing.
Pros / cons of both ?

Just remember to use the Vector Average when averaging responses to include the phase data for creating EQ filters.

 

[Greg Dunn]

One day I was curious about how well the moving mic technique matched averaged swept measurements. I have used only MMM for the last year or two because it is so easy and quick to set up, but I wondered...

So what I did was take about a dozen separate swept measurements at the LP, and at surrounding points about a foot away - in front, behind, above, below. These measurements looked about as different as you might expect. I then vector averaged them and got a composite average response. Then I ran a MMM with pseudorandom noise, very carefully, transiting the same volume I had just used for the swept tests. In both cases, I was measuring from about 15 Hz up to around 15 kHz (my hearing's upper limit).

The result? My MMM amplitude response was essentially identical to the averaged set.

I have manually (as well as using REW) created filters based on the MMM result, and the outcome was audibly the same. I have no reason to doubt the MMM results in my room, and it's almost trivially easy to get a measurement that correlates well to what I hear. As long as you take care to set it up properly and use pseudorandom noise, I have no problem recommending it for subwoofer setup.

 

[pmar4015]

One day I was curious about how well the moving mic technique matched averaged swept measurements. I have used only MMM for the last year or two because it is so easy and quick to set up, but I wondered...

So what I did was take about a dozen separate swept measurements at the LP, and at surrounding points about a foot away - in front, behind, above, below. These measurements looked about as different as you might expect. I then vector averaged them and got a composite average response. Then I ran a MMM with pseudorandom noise, very carefully, transiting the same volume I had just used for the swept tests. In both cases, I was measuring from about 15 Hz up to around 15 kHz (my hearing's upper limit).

The result? My MMM amplitude response was essentially identical to the averaged set.

I have manually (as well as using REW) created filters based on the MMM result, and the outcome was audibly the same. I have no reason to doubt the MMM results in my room, and it's almost trivially easy to get a measurement that correlates well to what I hear. As long as you take care to set it up properly and use pseudorandom noise, I have no problem recommending it for subwoofer setup.

Will you please provide your REW RTA settings? Thank you

 

[dcibel]

I'm not Greg obviously, but here's some settings I've used for room average RTA, aka moving mic method.

Use pink periodic noise generator, keep a constant pace of movement with the mic so you take about same number of measurements in each location. Once complete, save and apply psychoacoustic smoothing, for full range EQ >200Hz, use target slope of 0.7dB/oct.

 

[FargateOne]

I never came back after having discovered MMM for EQ my system. Better for less filters used and better for inner peace of an audio-OCD person!

 

[pmar4015]

I'm not Greg obviously, but here's some settings I've used for room average RTA, aka moving mic method.
View attachment 58382
Use pink periodic noise generator, keep a constant pace of movement with the mic so you take about same number of measurements in each location. Once complete, save and apply psychoacoustic smoothing, for full range EQ >200Hz, use target slope of 0.7dB/oct.

Many thanks! very helpful