The bel was named in honor of Alexander Graham Bell, but the bel is seldom used. The definition of the decibel originated in the measurement of transmission loss and power in telephony of the early 20th century in the Bell System in the United States. The decibel scales differ by a factor of two, so that the related power and root-power levels change by the same value in linear systems, where power is proportional to the square of amplitude. When expressing root-power quantities, a change in amplitude by a factor of 10 corresponds to a 20 dB change in level. That is, a change in power by a factor of 10 corresponds to a 10 dB change in level. When expressing a power ratio, it is defined as ten times the logarithm in base 10. Two principal types of scaling of the decibel are in common use. For example, for the reference value of 1 volt, a common suffix is " V" (e.g., "20 dBV"). In the latter case, the numeric value expresses the ratio of a value to a fixed reference value when used in this way, the unit symbol is often suffixed with letter codes that indicate the reference value. The unit expresses a relative change or an absolute value. Two signals whose levels differ by one decibel have a power ratio of 10 1/10 (approximately 1.26) or root-power ratio of 10 1⁄ 20 (approximately 1.12). It expresses the ratio of two values of a power or root-power quantity on a logarithmic scale. The decibel (symbol: dB) is a relative unit of measurement equal to one tenth of a bel ( B). For other uses, see Decibel (disambiguation). For use of this unit in sound measurements, see Sound pressure level. The complete sound sounds like it's out of phase.This article is about the logarithmic unit. If I use all measuring positions (believe I have 6 or 9). And the more measurements I take, the further the sound seems to shift. Could you please give me some pointers ? And I have read all the guides on mic positioning etc. I like my center stage to be dead center on my listening position. Same goes for music in stereo mode (obviously). I've redone the automatic setup so many times, but I never get the result I'm looking for. It works a little but not the way I'd like it to be. So to try and compensate I tried lowering the level of the right speaker to shift the center image more to the middle of my seating position. The voices in music appear to be coming more from the right speaker. The problem I then get is that when music in a 5.1 mix is transmitted stereo through the two front speakers it doesn't appear to be coming from the center position as I would like. but that's not an actual listening position on the couch. to the right of the first position about 2 ft. I then for the second measurement move the mic (have it on a boom/mic stand). So that was my first seating position for measuring. It's placed against a wall and I always sit on the left side of the couch. My couch is on center between my speakers. But I'm having some trouble with Dynamic EQ. Why does it have to be so ridiculously loud ?Īnother question, not sure if this is the right topic. If I play at reference level I'm at 82% of my amps power! This will literally make me dead in about 20mins. I understand the reference setup, although all mixers must be deaf by now.
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