+/- på lyd

[sevs]

Er det noen forskjell hvis jeg bytter om på + eller - pol på høyttalere/hodetelefoner generelt sett?

[Dr. Brodsky]

Ja, det har noe å si, men du vil mest sannsynlig ikke høre forskjell. Det viktigste er at du kobler likt på alle.

 

Absolute Polarity

When an instrument produces a sound, the sound consists of a series of alternating rarefactions and compressions of air. The sonic signatures of such acoustic musical instruments are determined by the pressure and spacing of these rarefactions and compressions. Electronic recording and reproduction have now made it possible to turn rarefactions into compressions and vice-versa.

The significance of this to the problem of establishing a home concert hall is not entirely clear. But a few people seem to be able to hear a difference between correct and incorrect polarity. Therefore, care should be taken that all amplifiers, speakers and ambience sources, taken together, do not invert. Since acoustic reflectors in concert halls do not invert polarity, the key early reflections, at least, should not be inverted accidentally in home reproduction either and should be delivered to the ears with the same polarity as the direct sound which is, one hopes, also of the correct absolute polarity.

If you cannot tell one polarity from the other in your own system, don't despair. For a few people, polarity is only audible when special test signals are used. One possible reason for difficulty in this regard is the nature of many instruments. A listener to the left of a violinist hears one polarity, while a listener to the right hears the other polarity, assuming the string is vibrating in the same plane as the ears of both listeners. But no matter where you stand around a trumpet you get the same polarity. The inverted polarity sound in this case is inside the trumpet. Indeed it has been reported that test subjects are more likely to hear polarity differences where wind instruments are involved.

On balance, one would have to say that it does not pay to agonize over the absolute polarity effect unless you are certain that you or your friends are sensitive to it."

Kilde: www.ambiophonics.org