Comment on the phase would interest me. Crossover is at 180Hz. Do dynamic drivers keep the phase alignment as well? I've not seen many measurements of that.
Is the phase unwrapped Ray? Regardless, I have not seen one that flatlines that way.
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How would you design the Ultimate Magnepan?
- Thread starter TitaniumTroy
- Start date
Is the phase unwrapped Ray? Regardless, I have not seen one that flatlines that way.
Yes it is unwrapped, and repeatable.
Oh, just noticed you use an EQ. How does it look without it?
Essentially the same, though it does a little work on the bass frequencies.
August 2014
I typically measure/observe in stereo. If the mic is not carefully centered phase goes mad.
August 2014
I typically measure/observe in stereo. If the mic is not carefully centered phase goes mad.
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It still feels like there is some kind of phase compensation going on. Without it I am not smart enough to explain it 
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REW -> Optical -> DAC -> Pre -> Amps -> Speakers. This is before the miniDSP showed up. Display below is quite zoomed in.
The output of the Pre is relatively phaseless... 4 degrees at 20Hz. There's 25 feet of unbalanced cable between the pre and PC, FR is about +/- 0.1dB
Not measured are the amplifiers, which I would expect to have similar lack of signature.
Here's an example of the pre-out with AcourateDRC applied to the miniDSP:
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AJ Soundfield
Major Contributor
Right, the Montis.
No, he showed me the imedance for the speaker they tested, not "the same". Not the Montis. A much earlier ML, prior to the infusion of engineering talent he also informed me about. The resonance, in the Stereophile measurement he showed me, was clear as day and matched what was seen in the FRs.
Right, I said I now totally agree with him/Sean. Their example had resonances. In a very bad area, 1-3k, where (audible threshold) sensitivity is high. So no surprise at all, it fared rather poorly in listening tests.
It would have very audible resonances, which quick switch blind tests would be highly revealing of.
I posted my phase graphs, in the interest of some lightweight observation and query.
Do we have any volunteers to post one of theirs from cones and/or horns?
How about from a pair of Magnepans?
Do we have any volunteers to post one of theirs from cones and/or horns?
How about from a pair of Magnepans?
I volunteer AJ because he has the biggest horns.
BTW here is my graph:
Isn't that pretty! Seriously, to have the graphs be comparable to each other we would need to standardized on smoothing and scale. Otherwise, it is very easy to show incorrect information like above (which was produced due to much shrunk vertical scale).
Isn't that pretty!
Seriously, to have the graphs be comparable to each other we would need to standardized on smoothing and scale. Otherwise, it is very easy to show incorrect information like above (which was produced due to much shrunk vertical scale).
I don't see any phase information in your graph, the first step would be to show the data for which I am curious, then we can argue the decorative qualities.
Sure, here you are:
Note: I do NOT calibrate my microphone for acoustic measurements (level or frequency response). So don't go by absolute levels, roll off, etc.
Now see, scaling isn't a problem at all (yet).
The phase content, on the other hand, has me scratching what's left of my head a little.
What do you make of it?
The phase content, on the other hand, has me scratching what's left of my head a little.
What do you make of it?
AJ Soundfield
Major Contributor
I've lost the plot here, what are we doing?
Don't be afraid. After all, it is MY speakers that are crap.
He is asking why it is that the phase delay in his measurements become zero after some frequency and stays that way. Look at his measurements.
No, the only speakers that are crap is whatever AJ produces. Compared to that, we all have the most transparent speakers!
I'm curious about phase measurements of different speaker systems.
The thread is "How would you design the Ultimate Magnepan?" which is a planar type speaker and mine are sort-of planars, and phase interests me (and JJ from a post at AVS and the Rythmik guy (whose name escapes me at the moment) who said "Impossible") so rather than me just making snide remarks about obtuse things or going totally out of the realm of the topic, I'm looking for some information or experience on this subtopic.
I see very few measurements if I googulate the topic, if I did, I might not be asking.
Phase is pretty much irrelevant for 'steady' tone, but I would think it has some bearing on the perception of transients or attacks.
Do you have any old measurements you could contribute?
If you guys like, I'll shut up, if discussing this a little is too painful or otherwise forbidden in Professional Scientific Audio Circles.
You and me both.
With a delay from the speaker, the phase differential should be proportional to frequency but obviously is not in your measurements. I am hoping Don or someone else chimes in with an explanation.Did you do any IR calculations in REW or any other setting that might affect timing?
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