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Δικάναλος Ήχος
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Τεχνικά θέματα Ήχου - Ακουστική χώρων
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<blockquote data-quote="Timbre" data-source="post: 569900" data-attributes="member: 4351"><p>Κοίτα...πολλά -κατά την γνώμη μου πάντα- που γράφτηκαν εδώ δεν ισχύουν.</p><p>Καλό είναι να υποστηρίζουμε τις απόψεις μας δίνοντας στοιχεία.</p><p></p><p>Δες αυτό για αρχή και μετά θα σου γεννηθούν διάφορα ερωτήματα που αν ψάξεις και λύσεις, θα έχεις την δική σου, άποψη...</p><p>Η wiki έχει αρκετά θέματα να σου απαντήσει.</p><p></p><p></p><p>"<em>With speakers, exactly the opposite is true, a flat low-frequency response being very hard to obtain except in free space high above ground or in a very large and <a href="http://en.wikipedia.org/wiki/Anechoic_chamber" target="_blank">anechoic chamber</a> free from reflections down to 20 Hz. Until recently it was not possible to achieve high levels at frequencies down to 20 Hz without high levels of harmonic distortion, and even today the best speakers are likely to generate around 1 to 3% of total harmonic distortion, corresponding to 30 to 40 dB below fundamental. This is not really good enough, given the steep rise in loudness (of 6 to 10 dB per octave) with frequency revealed by the equal-loudness curves below about 50 Hz, and a good experimenter must ensure that trial subjects really are hearing the fundamental and not harmonics, especially the third harmonic which will be especially pronounced as speaker cones become limited in travel as their suspensions reach the limit of compliance. A possible way round the problem is to use acoustic filtering, such as by resonant cavity, in the speaker setup.</em>"</p><p></p><p>Απόσπασμα από εδώ:</p><p></p><p><a href="http://en.wikipedia.org/wiki/Equal-loudness_contours" target="_blank">http://en.wikipedia.org/wiki/Equal-loudness_contours</a></p></blockquote><p></p>
[QUOTE="Timbre, post: 569900, member: 4351"] Κοίτα...πολλά -κατά την γνώμη μου πάντα- που γράφτηκαν εδώ δεν ισχύουν. Καλό είναι να υποστηρίζουμε τις απόψεις μας δίνοντας στοιχεία. Δες αυτό για αρχή και μετά θα σου γεννηθούν διάφορα ερωτήματα που αν ψάξεις και λύσεις, θα έχεις την δική σου, άποψη... Η wiki έχει αρκετά θέματα να σου απαντήσει. "[I]With speakers, exactly the opposite is true, a flat low-frequency response being very hard to obtain except in free space high above ground or in a very large and [URL="http://en.wikipedia.org/wiki/Anechoic_chamber"]anechoic chamber[/URL] free from reflections down to 20 Hz. Until recently it was not possible to achieve high levels at frequencies down to 20 Hz without high levels of harmonic distortion, and even today the best speakers are likely to generate around 1 to 3% of total harmonic distortion, corresponding to 30 to 40 dB below fundamental. This is not really good enough, given the steep rise in loudness (of 6 to 10 dB per octave) with frequency revealed by the equal-loudness curves below about 50 Hz, and a good experimenter must ensure that trial subjects really are hearing the fundamental and not harmonics, especially the third harmonic which will be especially pronounced as speaker cones become limited in travel as their suspensions reach the limit of compliance. A possible way round the problem is to use acoustic filtering, such as by resonant cavity, in the speaker setup.[/I]" Απόσπασμα από εδώ: [URL]http://en.wikipedia.org/wiki/Equal-loudness_contours[/URL] [/QUOTE]
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Tα 20 ΗΖ - 30 ΗΖ ακούγονται στο σπίτι;
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