Actually, let me amend what I said. Without looking out the window (metaphorically) you couldn’t tell. However, if you had a clock on board, and and an identical clock far enough away that it was effectively in zero gravity, AND you could view it through a telescope each revolution, you would (eventually) see that the clock runs faster than yours. That would at least tell you that it was experiencing lower gravity than you were.

This is akin to one of the effects that we have to account for with GPS satellites. Putting a clock in orbit (with a big enough display) would let us see the discrepancy compared to an identical clock on the surface, deeper in the gravity well.

I didn’t say it wasn’t accelerating.

Maybe I guessed wrong at what part you thought was weird. There’s no different between freefall and zero gravity. Although, for the special case of an orbit there are slight differences you can detect at different heights.

It’s because an orbit isn’t a rotating frame - the pull of gravity is always down, you’re just moving sideways so fast you miss the planet, by which time the angle of gravity has shifted so that it’s still down.

Right, although the sensitivity still varies. The Stealth Arya are a good example of this, they’re too quiet and mediocre driven from a iPhone (or even an unbalanced cable from my DAP) but come to life with a stronger amp.

For every frequency, headphones have slightly different impedance and sensitivity (power needed to product a certain volume). In principle if an amp is underpowered the headphones can sound loud enough but the frequency response is distorted, particularly towards the extremes, because the amp can’t power those frequencies. This is why people say the bass and treble are lacking.

Very generally, I’ve found that if a pair of headphone produces “listenable volumes” but are not actually loud when the phone volume is at max, then they’ll perform better with a more powerful amp.

Another aspect not mentioned yet: As a poisonous species, you outnumber the predators. There will be enough of you to reproduce even while some are being eaten (and taking their predators with them). So camouflage isn’t part of your survival strategy as a species. You’re then free to use colors for other things such as mating markers.

Compare this to a non-poisonous prey species which can’t deviate from camouflage colors without risking being wiped out.