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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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In Reply to: doh! more info.. posted by stuck.wilson@gmail.com on March 26, 2007 at 13:02:03:
I'm not too sure how much math you want. The formulas for capacitive and inductive reactance are widely known. You know, the 2-pie stuff. Or worse yet, that funny w, omega:)Suffice to say that a cap’s, or an inductor’s, AC resistance (called impedance) is a function of frequency. In your second order low pass crossover the inductor blocks the highs and the cap shunts any of the highs that get past the inductor to ground. The reactance of the 4uF cap at 1k5 is 26.53 ohms and the 5uF cap is 21.22 ohms. The reactance of the 3mH inductor would be 28.27 ohms.
These parts form a frequency dependent voltage divider with you woofer. Just consider that the cap is in parallel with the woofer and look at the reactance ratios to see how much power is going where.
3.7uF looks about right assuming 14 ohms for the driver. But is your 14 ohms for the woofer telling the whole story? What of its rising inductance (Le)? Do you have a zobel network in place? Remember you need to account for how many ohms that woofer is an octave or two past the crossover point also.
The 5uF cap would have been rolling off the highs that sneaked past the inductor a little more aggressively, and earlier, than the 4uF caps does. The quality of the cap might be a factor but I'd also think (okay big wild ass guesss) maybe you like your woofer running up higher or the treble driver is a little harsh pushed down that low.
Russ
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Follow Ups
- Re: doh! more info.. - Russ57 15:12:05 03/26/07 (3)
- thanks russ! - stuck.wilson@gmail.com 10:23:33 03/27/07 (2)
- In that case - Russ57 10:56:52 03/27/07 (1)
- Re: In that case - stuck.wilson@gmail.com 14:07:57 03/27/07 (0)
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