From a9d0090a0860e2d8a12965a6e9fffa9bb166a0db Mon Sep 17 00:00:00 2001 From: Joop Schilder Date: Sat, 8 May 2021 19:57:08 +0200 Subject: [PATCH] Add simple SPA for calculating crossover components --- public/index.php | 140 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 140 insertions(+) create mode 100644 public/index.php diff --git a/public/index.php b/public/index.php new file mode 100644 index 0000000..1db38d9 --- /dev/null +++ b/public/index.php @@ -0,0 +1,140 @@ + + + + + + + + First-order crossover component calculator + + + +
+ This is a simple component calculator for a first-order crossover. Component values are calculated with the following formulae: +
+ C = 1 / (2 * π * f * R)
+ L = R / (2 * π * f) +
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+ First-order filters have a 20 dB/decade (or 6 dB/octave) slope. All first-order filters have a Butterworth filter characteristic. [...] + First-order filters are considered by many audiophiles to be ideal for crossovers. This is because this filter type is 'transient perfect', meaning it passes both amplitude and phase unchanged across the range of interest. [...] + In practice, speaker systems with true first-order acoustic slopes are difficult to design because they require large overlapping driver bandwidth, and the shallow slopes mean that non-coincident drivers interfere over a wide frequency range and cause large response shifts off-axis.
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From Wikipedia: Audio Crossover
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Tweeter impedance (Ω):
Woofer impedance (Ω):
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+ Component table for tweeter and woofer +
Crossover Frequency (Hz)Tweeter Capacitor (μF)Woofer Inductor (mH)
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