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| By: swez on Fri, 3 Oct 16:00:49 -0500
| | CAPACITOR FILTERING CHARTS: HIGHPASS
Highpass Filtering:
To determine the crossover frequency a certain amount of capacitance will give you, use the formula:
F = 0.159/(C x Rh)
Explanation of Terms:
C- .....is the capacitance value (in Farads)
.........(1Farad = 1,000,000 uF)
Rh - ...is speaker impedance (usually 2, 4 or 8 ohms)
F - .....is the crossover frequency
Filters By:
Crossover Frequency (Hertz)
Capacitance uF (microFarad)
Freq.......8 Ohms...........4 Ohms...........2 Ohms
(Hz).......(uF)................(uF)...............(uF)
80..........248................497................993
100........198................397................795
120........165................331................662
150........132................265................530
200........99.................198.................397
280........70.................141.................283
400........49.................99..................198
600........333................66..................132
800........244................49..................99
1K.........19..................40..................79
1.2k.......16..................33..................66
2k..........9.94...............20..................40
4k..........4.97...............9.94...............20
5k..........3.98...............7.95...............15.90
6k..........3.31...............6.63...............13.25
8k..........2.48...............4.97................9.94
10k........1.99...............3.98................7.95
12k........1.66...............3.31................6.63
Filtering by Capacitor Value:
Capacitance uF (microFarad) VS Driver Resistance
Crossover Frequency VS Cap Value and Resistance
Cap Value.…8 Ohms….…...4 Ohms……….2 Ohms.
.(uF)………..Freq(Hz).…….Freq(Hz).…….Freq(Hz)
2.2.…….......9k…...........18k…......…...36k
3.3…..........6k…...........12k…............24k
4.7....……....4.2k...........8.5k…..........17k
6.8..……......2.9k……......5.8k.......…....11.7k
10.……........2k…...........4k...........…..7.95k
22........…...903..…........1.8k.............3.6k
50.…..........398.....….....795.........…..1.6k
100….........199.......…...398..............795
200..….......99..............199..............398
500...........40...............80...............200
It is recommended that you use NON-POLARIZED electrolytic caps here. If you cannot find the specific value you need in one cap, you may wire multiple caps in parallel, to reach the value required. (Ie: 50//50 = 50+50 = 100uF)
Note: This information was copied from Passive filtering tables off Tripod: xsspl web site
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