Line level passive BSC
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 Multi-Way Conventional loudspeakers with crossovers

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 24th July 2009, 03:53 PM #1 diyAudio Member   Join Date: Jun 2005 Location: Singapore Line level passive BSC Hi, To cut a long story short, i built the Madisound RB kit, and realised that i need about 3dB more BSC. I 'm trying to work out a passive line level BSC between my receiver preout to power amp input (NAD214s). I found this article whcih describes a passive BSC design. http://www.t-linespeakers.org/tech/b...ssive-BSC.html My baffle width is 7inches, for BSC Fc about 650 Hz is needed. NAD 214 input impedance is 60kohm 500pF With the following values of Rs and Cs (3dB compensation) Rsource < 2k ohm R1= 8300 ohm R2= 20000 ohm C1= 1.7nF C2= 11nF Cload= 500pF I get these corner frequencies for the BSC. FC1=723.43 Hz FC2=511.26 Hz FC3=11279.58 Hz FC4=17165.48 Hz I'm not sure if i'm in the ballpark, or am i way off? The article mentioned R2 should be much less than power amp input impedance. Is 20k too close to 60k? Help much appreciated!!
 27th July 2009, 02:09 AM #2 diyAudio Member   Join Date: Feb 2002 Location: Western Sydney Rod Eliott's article shows you how to make the freq variable, that way exact values don't matter so much... http://sound.westhost.com/bafflestep.htm __________________ Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency

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