Tests and objectivity. The art of audio

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Tests and objectivity

The art of audio

I have long wanted to talk about tests and their objectivity. Most of the Hi-Fi publications are simply crammed with all sorts of tests, they test everyone and sundry and in absolutely different conditions. Let me give you an example: I used to work at the Institute of Applied Physics in Moscow and tested all kinds of electronic equipment on the reference equipment of Brule & Kier. So - in order for the tests to be reliable, I had to carry the equipment to the State Verification Office in one of the military factories near Moscow - only there was reference equipment.

I can give one more example: after upgrading my equipment, the sound became so pure and clear that the network became clearly audible and you could hear how the phase was spinning. The sound can be the same for a week or two, or it can change several times a day, and all this is very well audible. Particularly bad sound on weekends - but not always.

Try connecting an oscilloscope to a 220 volt network (only through a trans.) And look at the sinusoid (tops are cut off, asymmetry, a step, heaps of pulses and harmonics, and all this moves in addition). And you can often read that the amplifier has a very expensive and high-quality network cable. And if this piece of gold is connected to the half-rotted and half-burnt aluminum of our Russian networks, will this change anything?

As long as the current reaches the tested Hi-Fi or Hi-End equipment through a lot of bad contacts (a bad contact is a coal, and a coal is a resistance), then it will undergo very large changes, and depending on the energy consumers and the quality of the network, it will have at different times a different form, and the test will be absolutely not objective. I brought three phases into my apartment and each phase has a different sound. Is it possible to test in such conditions? I believe that you need to test equipment only with a reference power supply with absolute frequency, voltage and sine wave - and only then the results will be more reliable.

As for the acoustic tests, this is a separate conversation. You may have noticed that in some Hi-Fi magazines, tests of the same speaker have completely different results. In some tests they are praised, while in others they are scolded. For example, in one of the Hi-Fi magazines, tests are carried out in a residential apartment in a 15 meter room (well, very objective testing). Keep in mind that the same speakers in different rooms, with different placements, with different cables and with different equipment will sound completely different.

All these tests have only one purpose - it's advertising.

You look more closely - in all the magazines they run about a dozen of the same models. In each article, advertising is felt and no objectivity. The best way to pick up acoustics for yourself is to listen to them in your room and with your equipment. And he will agree with the seller in case of a rollback (some reputable salons in Moscow provide such a service). I chose the AC for myself in this way. Otherwise, you can waste a lot of money and get zero results.

And finally. In civilized countries, such magazines are distributed completely free of charge as an advertising booklet, while in our country they are sold for big money.

Author: Nikolay Romanov

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