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I was just able to obtain three additional Palmer Orbit11 units for measurement.
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For an accurate comparison, I kept the microphone position fixed and simply swapped the speaker samples one by one during the measurements.
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To clarify any questions regarding the self-noise measurement conditions and equipment, I am sharing a photo of my measurement environment.
I use a Larson Davis CAL250 SPL calibrator together with an Earthworks M30 microphone. On the measurement day (today, Friday, March 13, 2026), the lowest ambient noise floor at the measurement site was 22.1 dB(A).
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Here I overlaid the graph of the sample I previously reviewed (measured on March 6, shown in gray) with the measurements of the three samples tested today.
Red – Sample #1
Blue – Sample #2
Green – Sample #3
I also recorded the environmental noise floor before and after the measurements, and can confirm that the measurement environment noise floor did not change in any meaningful way during the tests.
Interestingly, even among the three samples measured today, the self-noise differences are quite noticeable.
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I also compared the measurements with the −20 dB PAD engaged.
(The speaker position was kept fixed, and the adjustment was made using the top control.)
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This figure shows only the −20 dB PAD measurements.
Interestingly, the sample measured on March 6 shows a level similar to Sample #1.
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Since these differences might potentially be related to sensitivity variations between units, I also compared far-field measurements.
If this were simply a sensitivity issue, the green sample (#3), which showed the lowest self-noise, should also have measured the lowest output level. However, that was not the case.
As a result, contrary to the initial impression based on a single unit, there appears to be a meaningful variation in self-noise between individual units.
Considering that the three samples I obtained at the same time showed up to about a 5 dB difference, it seems difficult to rule out the possibility that there may be a noticeable unit-to-unit variation in the self-noise of Palmer Orbit11 speakers distributed worldwide.
Given this situation, it actually seems quite natural that different ASR members report mixed impressions such as “the hiss is quite noticeable” versus “the hiss is audible but not really bothersome.”