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This was a time capsule. A time capsule for a place and a people who had little technology, no knowledge of the future, and an air of innocence. And now it's been recovered! As soon as you hear the story – how this box was found in a small town in Italy during some excavations – you'll know that it's just as amazing as its contents: two stereo gramophones from 1939 with their original accompanying records. Wow! Both machines sound beautiful, playing those original records with those original tunes, nearly 100 years later. The thing is that these recordings exist only because they were recorded on something called 33 RPM records. 33 RPM records, of course, were also called "LP" records. Nowadays we use the term "LP" to refer to a much slower speed: 33 1/3 RPMs. If we would play these recordings on a turntable at 33 1/3 RPM with a stylus of the same type, they would sound awful. In fact, the audio quality of this recording was so low when it was recorded that if you tried to play it on any modern turntable at any sort of normal volume you'd probably think your turntable was broken or that your speakers were blown or something. The turntable and speakers would sound fine, but the music would just be a strange kind of noise. That's because the turntable and speakers were designed for playing 33 1/3 RPM records at medium-to-high volume. But guess what, these two recordings weren't playing on a 33 1/3 RPM turntable or a normal-volume turntable or any turntable. They were played on a wooden phonograph with two tinny loudspeakers that were intended to play them on very low volume in the same room where the recordings were made. On most modern audio equipment, there are different electrical amplifiers for different types of output voltage. You have an electrical amplifier to drive a tweeter or a mid-range speaker – that's the type of amplifier that you'd use if you're listening to a FLAC file on your laptop with headphones – and you have a different electrical amplifier for driving a woofer, the kind of electrical amplifier that you'd use if you're listening to your iPod's music from your stereo system. The difference is voltage: Tweeter/mid-range speakers need something like 2 volts, but woofers need something more like 50 volts. In 1939, they didn't have this sort of thing! In 1939, there was just one type of amplifier that could work with both tweeter/mid-range speakers and woofer speakers. And the only things that could make this kind of electrical signal were big things that generated big electricity. And in 1939, they didn't have transistors or any other kind of amplifier that could produce the same kind of signal but at a lower voltage. After World War II, they invented transistors and integrated circuits, which allowed for much smaller amplifiers to be made. So when you hear these recordings, realize that these people were listening to them on two tinny little loudspeakers in their living room at very low volume! "The audio quality is bad due to the lower speed of playback."https://i.imgur.com/kIyHjtj. cfa1e77820
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