I have built a pair of Pluto clones using a Minidsp, I have done all my own measurements and have found the tweeter EQ very close to that of Linkwitz ASP.
One thing I noticed was a big peak at 15K and have notched this, is this a cone resonance?
One thing I noticed was a big peak at 15K and have notched this, is this a cone resonance?
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
I found the same 15 kHz hump when I built my "Poor Plumber's Plutos"* and had to notch it as well. However, the FR on Aurasound's spec sheet at Aurasound's web site dosen't show a hump. Interesting, eh?
* http://www.diyaudio.com/forums/multi-way/172239-poor-plumbers-pluto-novel-diy-project.html
* http://www.diyaudio.com/forums/multi-way/172239-poor-plumbers-pluto-novel-diy-project.html
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Where is your microphone located?
If it's nearly inside the "dome" like SL's measurements, you're certainly going to see a peak like that.
Variability of the frequency response
Pull your microphone back and move it off-axis a bit and the peak will be gone.
Cheers,
Dave.
If it's nearly inside the "dome" like SL's measurements, you're certainly going to see a peak like that.
Variability of the frequency response
Pull your microphone back and move it off-axis a bit and the peak will be gone.
Cheers,
Dave.
It was located on axis as close to the cone as possible as if a piece of paper was resting on the surround, like SL did it.
SL measurements show the same notch, I will try another measurement as you suggest?
I also found that due to using a longer section of woofer pipe, the pipe notch was a bit lower in frequency and was less pronounced due to more stuffing? This also resulted in Qtc=0.62 and F3=73Hz, I used LT and a target Qtc=0.707 and F3=40Hz.
Time for a photo op.
SL measurements show the same notch, I will try another measurement as you suggest?
I also found that due to using a longer section of woofer pipe, the pipe notch was a bit lower in frequency and was less pronounced due to more stuffing? This also resulted in Qtc=0.62 and F3=73Hz, I used LT and a target Qtc=0.707 and F3=40Hz.
Time for a photo op.
An externally hosted image should be here but it was not working when we last tested it.
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His measurements don't show a peak like that. Take a look here at the top graph:
Pluto electronics
That peak is because your microphone is way too close. SL's very-near measurements were only to highlight driver differences and not to determine the equalization that should be applied to the tweeter for the real system
Cheers,
Dave.
Pluto electronics
That peak is because your microphone is way too close. SL's very-near measurements were only to highlight driver differences and not to determine the equalization that should be applied to the tweeter for the real system
Cheers,
Dave.
They do in the first link you sent, but as you said that is because the mic was so close, will make another measurement soon. Ta.
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