The spectrum of the musical signal. Part 8. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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The spectrum of the musical signal. Part 8. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Speakers

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Please note: there are few specialized "bass" discs in the table, and they are far from the top of the list, sorted by ascending lowest frequency present in the recording. The first bass disc is in fourth place in the table, and the one that made up the material for the SPL-phonograms of the IASCA referee disc is only in 10th place. The fact is that "espiel" discs are, as a rule, not about subbass, but about something else.

(click to enlarge)

There is also a spectrogram of one of the espiel tracks (second in a row) from the IASCA Competition disc.

During the first 20 seconds, the lion's share of the energy is concentrated in the 40 - 80 Hz band. And only during the next 20 seconds, infra-low-frequency components are added, in case the bass acoustics are configured this way. On the other three SPL-tracks (first, third and fourth) there are no such low frequencies at all, it's better not to look, but take my word for it.

Music signal spectrum

Special entry for SPL competitions. At what frequencies they mainly compete - can be seen with the naked eye.

A mosquito has a long nose to suck blood, a whale has a mustache to filter plankton, a shark has 12 rows of teeth to eat fish. Evolution has adapted biological species to their diet. Audio systems are not a creation of nature or the Creator, we will have to take care of them. An honorable task, putting the designer on the same level with nature or the Creator. In this publication, we set the task of providing the reader (if he is to some extent an audio system designer) with facts, and not with specific recipes, assuming that he will not trust us with this. However, it is difficult to resist what goes straight into the hands. Look at this: by designing a subwoofer to effectively reproduce frequencies above 30 Hz and nothing below, you will deprive yourself of the opportunity to appreciate the fullness of the sound of about three pieces of music out of hundreds of thousands that exist on the record. And make life much easier for yourself and the subwoofer.

Or another guideline. If we take into account the real spectrum of the musical signal, it turns out that in a multi-band system, the level of the signal supplied to the tweeters - the most vulnerable link in the acoustics, depends more on the order of the crossover filters than on anything else. This is a real reserve, if used correctly. However, the latter brings us to a conversation about crossovers and what depends on them, and this is a separate and difficult conversation. Next time...

Literature

Magazine "Autosound" № 11 / 2000

Author: Andrey Elyutin; Publication: avtozvuk.com

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