The word "crack" may have first appeared in a media publication in the sub-headline of a Rolling Stone article on May 1, 1980 titled "Freebase: A Treacherous Obsession: The rise of crack cocaine and the fall of addicts destroyed by the drug".[4] The article said that freebase made its "strongest inroads" in the music industry of Los Angeles and at this time, in 1980, the similar crack form had just been starting (and in a few years would become predominant and also move to the East Coast and elsewhere). The article describes both the earlier free base method of purifying cocaine to make it smokable which started in 1974 and the newer but similar crack making process. Freebase was made by users who would combine cocaine with baking soda and water and then extract the base salt, "freeing it" with ammonia. This achieves a lower melting point and when heated with a lighter the vapors are inhaled (but the substance was dangerously flammable). A less volatile but similar process was developed by dealers around 1980 where street cocaine is dissolved in a solution of water and baking soda and then dried out into "crack rocks". As the rocks are heated, it makes a crackling sound and this is how the substance got its name. It wasn't until 1985 after an article in the New York Times describing crack use in the Bronx, New York titled "A new, purified form of cocaine causes alarm as abuse increases"[5] that within a year, more than a thousand press stories were published.
When connecting my headphones ("Sony WH-1000MX3") to my laptop (HP Pavilion) I am getting a bad bluetooth audio output. It's crackling all the time and overall sounds like an audio with 64kpbs. So it neither sounds completely like crap nor is the bad quality barely noticable. It's hard to describe and I am sure 20% of the users would not even notice the bad quality but I definetly do.
3) Fender Strat into a cheap Zoom G1XN. I got a bit of crackling when I moved the receiver in the socket but reception was fine when I left it alone and played. This seems to be an issue between the Zoom and the U2 connection.
The common method of ingesting crack is smoking. It is refined by removing hydrochloride salt that is present in the street form of cocaine. It is said that crack makes a crackling sound when smoked.