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doesn't do a thing for music.
It doesn't do anything for "music that happened to be mastered in 2-4 channels". It does plenty for music.
So that's not really plenty of music.
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It's not clear to me from the information here that Sonos themselves can't refurbish a device that's been put into recycle mode. This seems to be a technique to block third party refurbishers only.
It appears they can, but choose not to. This way they can ensure that less used units are available on the market, forcing people to buy a new unit instead.
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> Inaudible ultrasonics contribute to intermodulation distortion in the audible range. Systems not designed to reproduce ultrasonics typically have much higher levels of distortion above 20 kHz, further contributing to intermodulation. Widening a design's frequency range to account for ultrasonics requires compromises that decrease noise and distortion performance within the audible spectrum. Either way, unneccessary…
I don't need it for music. I want to record ultrasound from the environment, and possibly play signals of my own.
It was to scare away the stone marter family that had made themselves a home under my parents' roof tiles. They are a protected animal where I live, so you can't just do anything to get rid of them. But they also tend to chew on cables in your car (they really do), making them dangerous. Also make a LOT of noise when they go hunting at night.
Looking up various ways to get rid of these animals (apparently they also really dislike the smell of toilet fresheners, which you can place under your car hood or something), I found an ultrasound device but it was kinda expensive for single use.
So I generated a bunch of high frequency tones, to make it extra annoying I had it do random(10,20) seconds of beep, then random(10,20) seconds of silence.
I burned this to a CD, made three tracks at 15kHz, 17kHz and 19kHz. I didn't go higher because I had no way to find out if the speakers would be able to reproduce that tone :) I could clearly hear 15k, and my parents a little. I could nearly hear 17k, and my parents swore they heard nothing. Neither of us could hear the 19k, even at the loudest volume.
Since I don't live there, we decided to put the 17k track on repeat, at max volume, because at least we knew it made a sound (that I could barely hear). The CD player was placed next to an open window close to the nest.
That very night, the stone marter family got up and left. We assumed they probably just moved a few houses over, or something. However ...
Just to be sure they wouldn't return, my parents left the CD player on repeat for an entire week. After that week when my dad turned off the CD, five minutes later, he walked into the garden ...
"Hey, the birds are back!"
(... and to think there's a popular route close to their house for people walking their dogs ...)
So yeah, that definitely worked. It's just not very specific :-P
Emerging, Rising: apologist arguments that equate compromise and degeneration of tools made out of a sense of personal cleverness, finding that one-use case where the trend might 'save the planet' or at least present it as such, winning the debate among like minds.
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And annoy pets? I had some failing electrical gear that produced extremely high frequencies. Drove the dogs a little crazy until I found it.
Not annoy, but learn more about them. The original idea of investigating ultrasound environment came to me when I was taking care of some rats for a few weeks for a friend; I read a short book on them, from which I've learned that they communicate with ultrasound, which made me want to "listen in" on that communication, and perhaps replay some of it. FWIW, I have a cat myself, and I'm not the kind of person to annoy…
I dunno how hard they are to build (that guy was pretty skilled), but I think you can also just buy these devices ready made. Probably called "bat detectors" or something.
I experienced a similar thing when I helped a friend install LineageOS on their bootlooped Android phone. Apparently, this process would have been 10x easier if they had switched on "OEM unlocking" in the Developer Options setting (which you can't do from the boot menu, recovery menu or via adb), which is off by default for a very stupid reason. We were successful in the end, but it was a LOT of hassle. So, when you…
I got hit by this same issue. We had a few spare phones at work in a draw and I wanted to give them to friends in need of a phone. Had permission from the company but no one knew who owned them or what the password was. I did the manual factory reset from the recovery but was hit by this "security" feature. I eventually managed to track down the original owner and had them unlock the devices. If I hadn't, these phone…
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I inherited a pair of speakers my dad bought in the early 80s. They still work well, though the amp died last year and I wasn't able to repair it.
You can get a number of small amps these days that will plug into the speakers and sound great. Many will also support Bluetooth so you can stream to your stereo.
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Then they would have to continue supporting those devices, which isn’t part of the planned obsolescence business model. It would also dilute the luxury brand halo that Sonos has tried to cultivate. It’s more like Louis Vuitton getting into the secondhand market. They too would (and do) destroy merchandise rather than let it get sold at a discount and dilute the brand value.
They’ve actually done a pretty good job of being backwards-compatible and even enabling features on older speakers if they’re grouped with newer ones. For example, having an AirPlay 2 speaker in a group means that all speakers in the group will receive sound through AirPlay 2, even if they didn’t support AirPlay in the first place. That makes this even more puzzling.