I took 10 minutes and did a "JNT ghetto spin" of the Polk R200's using an in-room nearfield MMM (1ft). I've included the REW mdat file. I measured both speakers and they measure similarly.
Unsmoothed 1/48 from RTA
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Maybe I see the 1khz bump, but it just doesn't seem as drastic. Also, I'm getting good bass response if I include the port tuning in the response.
Here's the measurement from today compared to the one I did in February 2012 if the timestamp on the measurement is right. This was taken in a totally diffrent room and above 500hz, everything lines up pretty well with the measurement I based my review on.
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What you have to be careful of is the baffle-step. Usually, 2X the width of the front baffle is a good starting point. The thing about a MMM, is it's a spatial average, so you can cover a wide area.Isn't 1ft too close to get proper driver integration and crossover summing?
Also, how did you generate the LW and Sound power from the MMM measurements.
I find MMM measurements at a couple meters out, gets pretty close to the early reflections curve.
Lazy and ingenious!! Good job.What you have to be careful of is the baffle-step. Usually, 2X the width of the front baffle is a good starting point. The thing about a MMM, is it's a spatial average, so you can cover a wide area.
I opted for being closer in this case because my kids were being loud upstairs, so I needed the higher signal/kids playing ratio.
I just measure all around the speaker by spinning it on a motorized plate which gives me a rough estimate of sound power. From there, I can just drive the DI. This is just a quick and dirty method. I think if more reviewers did at least this, we would have a lot more reliability in reviews. I'm working on a way to get even more precise measurements, but 10 minutes for 2 speakers is not bad.
Thanks!Lazy and ingenious!! Good job.
I wish I could've tried this on my DIY towers before I sold them. Would have been interesting.
I guess if you did a stationary MMM at 2m out, you could drive an ERDI?
I’m waiting on Erin to send Pierre the raw spinorama data, and then for Pierre to upload the results on his website. He usually does, every couple of months. Once he does, I’ll know the preference score and I can update my guide.Do you know when the preference score will be updated on the passive speaker list? Thanks in advance