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As Peter mentioned, it's almost always the left speaker that starts being scratchy first as that's the tip of the headphone connector.
Most common reason is dust getting pushed in together with the plug, and dust between the contact surfaces is obviously bad.
Before doing anything else, get a can of compressed air (one of those with a thin enough nozzle that fits inside the contact) and try to blow the dust out from the connector, or use a wooden toothpick (not metal, it will scratch the contact surface) and try to clean the contact surfaces.
I have to do this on my phone every now and then due to pocket lint.
Wrong is evil and must be defeated. - Jeff Ello
Never stop dreaming - Freddie Kruger
modified 12-Nov-20 3:52am.
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DING DING, we have a winner! This worked like a charm!
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Wrong is evil and must be defeated. - Jeff Ello
Never stop dreaming - Freddie Kruger
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1/ millenial answer : buy a new laptop
2/ very good answers : see Peter & Jörgen's answers - bluetooth sounds also technically good but I personally try to avoid having wave-based devices around my brain.
3/ good answers : other above
4/ I would not be too afraid to open the laptop and resolder a new connector, even if this sounds complicated. The worst that can happen is that you loose time and have anyway to switch to one of the other solutions.
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Rage wrote: 4/ I would not be too afraid to open the laptop and resolder a new connector, even if this sounds complicated. The worst that can happen is that you loose time and have anyway to switch to one of the other solutions.
If it ain't broken... don't touch it.
But once it is already broken... why not try to repair it? The possibility of having to do another thing is always there.
M.D.V. 
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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Yes, exactly my point. Chances are also high that you learn something on the way.
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Rage wrote: bluetooth sounds also technically good but I personally try to avoid having wave-based devices around my brain
Also, if someone has invested in a pair of Paradigm Active/20, i think bluetooth is out of the question.
Wrong is evil and must be defeated. - Jeff Ello
Never stop dreaming - Freddie Kruger
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Note that a new Bluetooth LE audio standard has been adopted fairly recently - see The next generation of Bluetooth audio[^]. The standard is so new that few commercial products are out on the market yet.
The new "LC3" codec is available separately so you can run it on an ordinary PC for testing. I have listened to several samples on fairly high quality equipment, and was certainly impressed, especially with the minimal quality loss with reduced bitrate.
Another claimed advantage is very low latency for the encode/decode cycle, so the sound stays in sync with the video. (It is said to be designed with gamers in mind; those guys demand extremely low latency!)
When LC3 supplants "classical" BT audio, there will be far less reason to be sceptical to BT. As far as I know, the new BT audio comes to Bluetooth Low Energy only, not to the original, non-LE Bluetooth. Almost all BT wearables use the LE variant nowadays, so that's what you want for your earplugs. But don't expect your classical BT headset to be upgradable to LC3.
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I have no experience with LC3, so I can't tell.
But according to opinions on audiophile forums, for whatever it's worth, it's supposedly still inferior to AptX HD in sound quality.
These are on the other hand the same forums where people can hear a difference between optical cables. 
I do know though, that on my headphones which I can use with Bluetooth and AptX as well as cabled, cabled is clearly superior.
Wrong is evil and must be defeated. - Jeff Ello
Never stop dreaming - Freddie Kruger
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Speaking of "brain waves", doing some geomancing and noting that monitors give off "a lot" of magnetic radiation (2-3+ ft).
It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it.
― Confucian Analects: Rules of Confucius about his food
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If cleaning the jack doesn't work, I can highly recommend the Audioquest Dragonfly (comes in 3 different levels; Black $99, Red $199, Cobalt $299). It is my portable headphone source of choice and is quite small. It is amazing how good it is, and if you care about music, not too expensive for the sound quality. If it is for only at home and you don't need portable, then there are many options and I would suggest looking at schiit.com for a good dac/amp combo or separates (you would just need to use the preamp outputs for your speakers).
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Quote: Pfizer Inc. Chief Executive Officer Albert Bourla cashed out 62 per cent of his stock in the company on the same day it announced the success of its experimental COVID-19 vaccine, a regulatory filing showed.
Barnum and Bailey.
It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it.
― Confucian Analects: Rules of Confucius about his food
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If memory serves, something similar happened with Moderna many months ago.
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Silly question.. is that legal?
Also, it does not show much faith in the company's future.
“That which can be asserted without evidence, can be dismissed without evidence.”
― Christopher Hitchens
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It's legal because the information was public knowledge when the trade was executed.
It can show a lack of faith in the company's future, but in this case I think it shows that the reaction to the announcement was overdone, so the shares were overvalued. If I owned shares, I'd be interested to see how many he eventually bought back, though he probably has options that he can use for that purpose.
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I also just saw a story saying that the shares were sold by an automated system once the price had reached a certain level.
“That which can be asserted without evidence, can be dismissed without evidence.”
― Christopher Hitchens
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That's certainly possible. It's a limit order. You can submit one in your brokerage account and it will remain active for about a month.
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Pfizer Coronavirus Vaccine News Raises Questions About CEO's Stock Sales : NPR[^]
Quote: "The sale of these shares is part of Dr. Bourla's personal financial planning and a pre-established (10b5-1) plan," Pfizer said in a statement. "Through our stock plan administrator, Dr. Bourla authorized the sale of these shares in February and renewed that authorization in August with the same price and volume terms."
The company spokesperson said Bourla's plan authorized stock sales when the share price hit a certain target.
maybe a happy (for him) coincidence?
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A Panda will spend 10-16 hours a day eating.
This is the same as a adult working from home for the first time.
That's why it's called a Pandemic ...
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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No more Eucalypti? Pandemonium.
It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it.
― Confucian Analects: Rules of Confucius about his food
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... when he saw himself in 4k?
HDMI
I'll take my coat on the way out
Wrong is evil and must be defeated. - Jeff Ello
Never stop dreaming - Freddie Kruger
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What did Yoda say to Anakin on his wedding day?
"May divorce be with you."
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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Did you know Yoda had a last name?
"Layheehoo"
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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You're killing me.
Wrong is evil and must be defeated. - Jeff Ello
Never stop dreaming - Freddie Kruger
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Yedi: "Master Yoda, what should we do with the prisoner?"
Yoda: "Kill him..."
BZZZZZZT!!
Yoda: "...You must not..." 
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