BTW, the moon effect is most noticeable when I’m streamimg MQA from Tidal. How ironic.
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Might have to install schrader valve onto acoustic suspension speakers. Ported speakers are more forgiving.
But seriously we do have to adjust the tire pressure and bleed the air pressure buildup in the suspension components at altitude, builds up quite significantly.
And baking needs to be adjusted to compensate for the lower air pressure, so…
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Less air density you would think could cause a speaker diaphragm to have longer excursions……grasping for straws, nothing to lose sleep over 
Sea level to New Mexico has me looking for some air for a few days
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Here some easy calculators for simulating the values of altitude, air pressure, moisture, air density, etc.
I am living in a country where I can easily travel in a few hours from sea level to above 2500 m, and the effects on air pressure and air density are noticeable. I’d assume that those differences of air density on the propagation of sound waves may not be negligible. But I also assume that our brain adapts rapidly to the new ambient conditions and we will scarcely notice.
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Now to sell audiophile air it would be something
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Please put me down for two 
Oh yes, 2 channels… @price of one
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Audiophile air has so many upsell possibilities. House treatments to prevent the air from getting out and closed system respirators so you don’t waste all that valuable air by breathing it. Big bucks.
I have been, when using my iphone & airpods the sound, at base camp, was very thin and tinny, no doubt due to the large gaps between air molecules & low frequencies had nothing to “hang on “ to. Sound quality improved tremendously as we descended.
Altitude or air pressure compensation is essential to avoid undesirable audio artefacts.
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That’s just the Cerebral Hypoxia setting in 
I’m on a company to collect audiophile wasted air… there is a used market
Lots of AudioPhil hot air is available in large quantities
Perhaps a giant geodesic dome over the whole house so that effective pressure needn’t depend on ambient pressure? Need airlocks for the garage and doggie doors, of course. But I’d think you could command a healthy profit margin, plus of course monthly service fees for the compressor.
I took diamox for that, so definitely an air molecule problem
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Bytes are not bytes as long they are touch by DSP
Intersting. Luckily, 99+% of extended living happens between the red lines. Maybe problems with export to lower altitudes is the cause for Tibet never developing a high-end manufacturing culture 
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and an army of living running audiophile pets for clean power
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Audiophile-quality hamsters in hamster wheels?