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Revision 252 - (show annotations)
Mon Sep 21 21:59:01 2020 UTC (8 months, 3 weeks ago) by ben
File size: 1372 byte(s)
version 1.4, fix slot port len
1 - about frequency response formulae:
2 http://www.diysubwoofers.org/
3
4 - about rectangular ports:
5 I deduced the function [1.1-log10(x+1.1)*0.35]*circPortLen where x = L/l, from the analysis of Francis Brooke. https://sites.google.com/site/francisaudio69/
6
7 - about multiple instance of the same loudspeaker:
8 Two drivers in series: Re, Le, Sd, Vas and Bl double and the sensitivity is the same as for one driver.
9 Two drivers in parallel: Re and Le are halved, Sd and Vas double (Bl same as for one driver) and the sensitivity increases by 6dB.
10 Qes, Qms and Qts don't change for either combination, remaining same as for one driver.
11
12 - about Legendre bass-reflex alignment:
13 Fb = 0.3802 * pow(Qts, 1.0657) * Fs
14 Vb = 10.728 * pow(Qts, 2.4186) * Vas
15 (see: https://sites.google.com/site/francisaudio69/5-l-enceinte-acoustique/5-6-comment-calculer-une-enceinte-bass-reflex)
16
17 - about Bessel bass-refex alignment:
18 Fb = 0.3552 * pow(Qts, 0.9649) * Fs
19 Vb = 8.0707 * pow(Qts, 2.5848) * Vas
20 (see: same site as above)
21
22 - about the Zbinden M4 alignment:
23 for average baffle:
24 Volume = (2.68 * Qts - 0.45) * Vas
25 Tuning frequency = 0.41 * sqrt(1/(Qts*Qts) + 0.97) * Fs
26 the one above is used in QSpeakers.
27 for infinite baffle or car application:
28 Volume = (2.52 * Qts - 0.35) * Vas
29 Tuning frequency = 0.32 * sqrt(1/(Qts*Qts) + 3.38) * Fs
30 (see: http://www.mzbinden.ch/ventedalignments/index.html)

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