Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 24th July 2009, 03:53 PM   #1
diyAudio Member
 
Join Date: Jun 2005
Location: Singapore
Question 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!!
  Reply With Quote
Old 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
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Passive line level x-over - CAN IT BE DONE? hasselbaink Multi-Way 24 21st January 2012 02:16 PM
Line-level passive crossovers vdi_nenna Multi-Way 3 15th June 2005 11:39 PM
Passive Line Level Crossovers GeorgeBoles Pass Labs 6 20th September 2004 10:49 PM
Passive line level crossover rulezzz Multi-Way 3 7th January 2004 08:45 AM
passive line level XO peterr Everything Else 1 5th March 2003 08:07 PM


New To Site? Need Help?

All times are GMT. The time now is 01:23 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2