Waste of time
A TOTAL waste of time posting this question here. First two pages are uninformed guesses as to why, and all of the following pages are consumed by unrelated posts by a troll. Find your answer over at the forum hosted by Parts Express.
A TOTAL waste of time posting this question here. First two pages are uninformed guesses as to why, and all of the following pages are consumed by unrelated posts by a troll. Find your answer over at the forum hosted by Parts Express.
An externally hosted image should be here but it was not working when we last tested it.
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Found an older thread that shows the old FRD graph and it put the SPL where it needs to be (89db) http://www.diyaudio.com/forums/multi-way/253962-help-spl-copy-frd-file-extraction.html
An externally hosted image should be here but it was not working when we last tested it.
2.83Vrms instead of 1watt...
a 1W @ 1M sensitivity measurement on an 8Ω speaker would be a 2.83Vrms @ 1M sensitivity measure
2.83Vrms @ 1m sensitivity does give a direct indication of how much louder one speaker will sound on a direct comparison, regardless of what the speaker impedance of each speaker might be.
https://www.reddit.com/r/audioengineering/comments/5ria6d/question_regarding_speaker/
a 1W @ 1M sensitivity measurement on an 8Ω speaker would be a 2.83Vrms @ 1M sensitivity measure
2.83Vrms @ 1m sensitivity does give a direct indication of how much louder one speaker will sound on a direct comparison, regardless of what the speaker impedance of each speaker might be.
https://www.reddit.com/r/audioengineering/comments/5ria6d/question_regarding_speaker/
That's all fine and dandy but, this is suppose to be THE SAME TWEETER.
Besides, I already got my answer from PE.
Besides, I already got my answer from PE.
The DC28F-8_readme.txt is measured at 2.83Vrms at a distance of 1 meter and the PE specs PDF measured at 1W at a distance of 1 meter.
That would account for +1,74 dB in favor of 2,83V condition.
I don't think such a motor has a chance of getting anywhere near 95 dB/2,83V/1m. The Dynaudios were 90 dB/2,83V/1m.
I don't think such a motor has a chance of getting anywhere near 95 dB/2,83V/1m. The Dynaudios were 90 dB/2,83V/1m.
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It's the same tweeter, but measured under different input powers. In the past, the specification was SPL per WATT, however, now specifications are made as 'SPL for an input of 2.83 VOLTS'.
For an 8 ohm load, applying 2.83 Volts causes 1 Watt to be dissipated. Because the tweeter has a 4 ohm nominal voice coil, at 2.83 V input you are actually dissipating a couple of Watts, therefore compared to the 1 Watt SPL the 2.83 V SPL will be higher. Hopefully this is what PE explained to you.
WTF??
Not even close as to why
It was a 8 ohm tweet before and an 8 ohm tweet now.
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Extraced from the FRD file:
"measured by OmniMic "1200743.omm" on 5/10/2014
Acoustic origin is -22.77useconds behind the mounting plane."
337.2x(22.7/10000)=0.765444m
Measured at 0.76m instead of one meter.
So...by that thinking and by looking at the DC160-8 specs by comparison, which are accurate, they must have measured this one from inside the dust cover on the cone.
From the DC160-8 .frd file.........
Standardized FRD file, measured by OmniMic "146122014.omm" on 6/18/2014 by userID:
Equivalent to driven with 2.83V and measured at 1m
Acoustic origin is 99.23useconds behind the mounting plane.
Simply put, NO ONE has a clue and this is all speculation.
Besides, I have the new .frd file from PE so this is all academic. PE will replace the .frd file on their website soon.
From the DC160-8 .frd file.........
Standardized FRD file, measured by OmniMic "146122014.omm" on 6/18/2014 by userID:
Equivalent to driven with 2.83V and measured at 1m
Acoustic origin is 99.23useconds behind the mounting plane.
Simply put, NO ONE has a clue and this is all speculation.
Besides, I have the new .frd file from PE so this is all academic. PE will replace the .frd file on their website soon.