Minidsp 2x4 hd vs avg meassurement

Thomas Larsen

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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

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May 21, 2017
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Location
Corpus Christi, TX
My AV System  
Preamp, Processor or Receiver
Yamaha RX-Z9 A/V Receiver
Universal / Blu-ray / CD Player
Pioneer BDP-23FD Blu Ray Player
Front Speakers
Canton Karat 920
Center Channel Speaker
Canton Plus D
Surround Speakers
Canton Plus D
Surround Back Speakers
Realistic Minimus 7 (front EFX speakers)
Front Height Speakers
Yamaha YDP2006 Digital Parametric EQ (front mains)
Rear Height Speakers
Yamaha YDP2006 Digital Parametric EQ (subs)
Subwoofers
Adcom ACE-515 (for power management)
Video Display Device
Yamaha DT-2 (digital clock display)
Screen
Audio Control R130 Real Time Analyzer
Remote Control
Stock Yamaha Remote
Streaming Subscriptions
Pioneer PDP-6010FD 60" Plasma TV
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
 
Last edited:

JStewart

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Dec 5, 2017
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Central FL
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

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May 23, 2017
Messages
77
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

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Oct 4, 2017
Messages
104
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.
 
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