Circola una bufala, i sistemi di correzione digitale non sarebbero trasparenti

[ilmisuratore]

Secondo il mio parere l'alignment tool opera sulla corretta centratura tra i due impulsi, ovvero: in modo che non si ottengano sfasati

Per la risposta in frequenza, sempre secondo la mia esperienza, puntando direttamente sul diffusore si ottiene una rilevazione sulle alte-altissime più congrua

p.s per scoprirlo basta fare una prova: si piazza il MIC al centro dei diffusori e si rileva la risposta di un canale, la si salva, si gira il MIC verso il diffusore e si rileva una seconda risposta, la si salva

Si caricano entrambe le risposte su un software di misura e si confrontano: se non ci sono difformità il MIC lo si potrà piazzare [in questo specifico caso] dove si vuole, se invece dovesse cambiare la risposta allora sarà meglio puntarlo verso il diffusore

[Vmorrison]

These observations imply that some of the problem lies in our interpretations of measurements made in small rooms. The horrendously irregular steady-state “room curves” that we see simply do not correspond to what we hear. Did our problems begin when we started to make measurements? Are we incapable of hearing these things? Or is it that we hear them, but they simply become part of the acoustical context within which other acoustical events occur, and we have some ability to separate the two? The answer turns out to be some of each.
Once a loudspeaker is in a room, it may be impossible to identify the contribution that the loudspeaker and the room each make to the combined measured result. Without those separate data, appropriately targeted remedial mea- sures for problems are not possible. All of this can only be deciphered through an understanding of how the sound from a loudspeaker radiates into three-dimensional space, is communicated through a room, and then is perceived by a listener. The performance of a loudspeaker is much more complex than anything revealed in an on-axis anechoic measurement. The perceptual processes of two ears and a brain are vastly more complex than anything revealed in a room curve or a reverberation time.
We need to start again. The following is a review of acoustic and psychoacoustic research from disparate fields, put into a framework that is familiar to the audio community. The result is intriguing. It turns out that some of our common practices are less than optimum, and some popularly held notions might need to be revised. It will be clear that not everything is known, and that there are sev- eral opportunities for significant and useful research.

[Vmorrison]

Reverberation time is a property of the room alone, and a correct measurement of it should employ an omnidirec- tional sound source capable of “illuminating” all of the room boundaries. The reason: it is assumed that the bound- aries consist of areas of reflection and absorption, and that the central volume of the room is empty. The several formulas by which we estimate RT confirm this. Some practitioners incorrectly use conventional sound-reproduc- tion loudspeakers as sources. The directivity of these is such that the resulting reflection patterns and decays are not properties of the room, but of the room and loud- speaker combination—a very different situation.
The result of a correct RT measurement is a number, or a set of numbers for different frequency bands, describing the decay rate over a range of sound levels, maybe 20 or 30 dB, and then extended by multiplication to give a num- ber for a 60-dB decay. It is common to look at the mid- frequency reverberation time and the variations with fre- quency. The former is a measure of the suitability of a performance space for different styles of music. The varia- tions with frequency are important because it is undesir- able to change the spectral balance of voices and musical instruments by excessive absorption in narrow frequency bands. This is critical in large performance spaces, be- cause almost all of the listeners are in a sound field domi- nated by reverberation.

[imaginator]

2 ore fa, FabioSabbatini ha scritto:

Spesso trovo utile anche l'acourate user group, immagino lo conosci già 

Sì sì, attingendo un po’ di qua e un po’ di là vedo e sento che i risultati sono tangibili. Poi con la curva target si può effettivamente ottimizzare la risposta secondo la propria esperienza ed il proprio gusto rimanendo nel giusto range naturalmente.

Se l’impianto di per sé è già ben settato  l’intervento calibrato del Dsp mette  ordine  al tutto e devo riconoscere che il risultato è decisamente positivo e si sente.