passive line level Crossovers pllxo - diyAudio
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 9th October 2006, 01:47 PM   #1
diyAudio Member
 
Join Date: Jun 2006
Default passive line level Crossovers pllxo

I would like to make 12db per oct xovers (passive line level) according to this website. I'm having trouble picking starting values. Could someone help me make sense of this?

http://www.t-linespeakers.org/tech/f...ssiveHLxo.html

This is for a car system and I need a xover for about 3.1 khz.

My Head Unit boasts a pre-out of 4v/100k ohm (Pioneer deh-p7500mp)
My amp (aura 2300) claims an input impedance of 14k.

do I just arbitrarily pick a starting value or are these numbers relevant?

Thanks
  Reply With Quote
Old 9th October 2006, 02:42 PM   #2
Rudolf is offline Rudolf  Germany
diyAudio Member
 
Rudolf's Avatar
 
Join Date: Mar 2003
Location: Germany
Default Re: passive line level Crossovers pllxo

Quote:
Originally posted by Preacher
My Head Unit boasts a pre-out of 4v/100k ohm (Pioneer deh-p7500mp)
Obviously your pre-out impedance should read 100 ohm instead of your stated 100k ohm. If that is true, you might start with 0,5-1kOhm for R1.
__________________
www.dipolplus.de
  Reply With Quote
Old 9th October 2006, 04:10 PM   #3
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Hi,

R1 needs to be 1.5 K (~ R2/10), R2 = 14K (in your power amplifier).

/sreten.
  Reply With Quote
Old 10th October 2006, 01:42 PM   #4
diyAudio Member
 
Join Date: Jun 2006
Thank you for the help; That makes sense to me. I didn't expect to see that impedance from my amp.

If I want a xover freq of 3.1 khz for the lowpass I came up with

c1= 3.42 uf
c2= .342 uf

I'm guessing that anything between 2 and 5 volts would be acceptable voltage for the caps. Would I use standard audio crossover capacitors (non-polar)?

If I'm missing something in my values please let me know. How close will this get me to the target frequency? Are these pretty accurate crossovers?

Geoff
  Reply With Quote
Old 11th October 2006, 08:57 AM   #5
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Hi,

with R1 = 1.5khz and 3.1khz c/o, C1 = 34.2nF nearest = 33nF.

So your values are 33nF and 3.3nF, use any film capacitors.


/sreten.
  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
help with passive line level crossover PLLXO for 33K impedance amps Daveis Analog Line Level 1 14th December 2008 08:12 PM
Line-level passive crossovers vdi_nenna Multi-Way 3 15th June 2005 11:39 PM
Passive Line Level Crossovers and Alephs (from a Neophyte) GeorgeBoles Pass Labs 8 27th October 2004 05:49 PM
Passive Line Level Crossovers GeorgeBoles Pass Labs 6 20th September 2004 10:49 PM


New To Site? Need Help?

All times are GMT. The time now is 07:17 AM.


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