Deriving rear fill from crossovers - diyAudio
Go Back   Home > Forums > General Interest > Car Audio

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 11th March 2006, 03:55 AM   #1
diyAudio Member
 
Join Date: Jan 2006
Location: St. Petersburg, Florida
Default Deriving rear fill from crossovers

I would like to know how to derive a rear fill channel from a standard 2-way passive crossover. I am running MB quarts Premium separates, which are like any other design. I see that Diamond Audio does it using adjustable resistors.

I researched some threads with no luck.
  Reply With Quote
Old 12th March 2006, 05:09 PM   #2
diyAudio Member
 
Join Date: Nov 2004
Location: sk
Send a message via AIM to ocool_15 Send a message via Yahoo to ocool_15
I'm not sure im understanding. You intend to use the given passive crossover to power the given speakers and some rear ones for fill? Or you want to understand the passive crossover to find the crossover point they used?
  Reply With Quote
Old 12th March 2006, 06:50 PM   #3
diyAudio Member
 
Join Date: Jan 2006
Location: St. Petersburg, Florida
The first one. I want to derive a rear fill channel, what Diamond Audio calls "RAF"rear audio fill using proprietary resistors and whatever else.

My amp for the highs is two-channel only, rated at 175 x 2 @ 4 ohms.

SO I guess I need to acquire the schematic for the passive x-over. But I need to know what to add and where so the final project does not lower the overall resistance too much.
  Reply With Quote
Old 12th March 2006, 06:58 PM   #4
diyAudio Member
 
Join Date: Nov 2004
Location: sk
Send a message via AIM to ocool_15 Send a message via Yahoo to ocool_15
I'm not sure of the propriety part but for rear fill I'm assuming you want the lowish freqencies passed to the rear channels. A low pass passive crossover would be a inductor in series with speaker 6db/oct

for 12db/oct thats series inductor then parralel cap.
18db/oct adds another inductor in series with the speaker.

since rear fill normally has less power then the fronts you would use a series resistance which would change the inductor/cap values. There are calculators online for the values.

as for finding info about your crossovers, sometimes its included but if not: Inductors arent usually marked but caps are. and from an 'online crossover calculator' you should be able to figure it out.
  Reply With Quote
Old 12th March 2006, 07:16 PM   #5
diyAudio Member
 
Join Date: Jan 2006
Location: St. Petersburg, Florida
Thanks. I will search for the schematics or even try to read them from the crossevers themselves.

Maybe it would be better to just buy the Diamond Audio speakers are sell the MB Quarts.

http://www.diamondaudio.com/support/...age=faq&id=184
  Reply With Quote
Old 12th March 2006, 07:28 PM   #6
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
Ahhh! , you want a complete set of rear speakers - you might consider a pair of "CSS FR125 S" - nice and simple

UPS!...Car Audio...didnt see that...sorry!
  Reply With Quote
Old 12th March 2006, 07:28 PM   #7
diyAudio Member
 
Join Date: Nov 2004
Location: sk
Send a message via AIM to ocool_15 Send a message via Yahoo to ocool_15
"the different levels" with a series resistor would change the crossover point depending on the level so either they are a allpass signal or they are using a L-pad.

Ever tried using some series power resistors with your rear speakers? maybe something 10W and 10-50ohms?
  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
Deriving Secondary Voltages dre7 Tubes / Valves 0 16th October 2007 07:41 PM
Deriving I2S from Sony CDP Peter Daniel Digital Source 59 3rd June 2006 09:16 PM
the rear fill ch of the jl 500/5? MyNameIsJake Car Audio 2 13th January 2006 05:18 AM
Deriving I2S from Philips LHH CD players ... deskmate88 Digital Source 0 7th June 2003 07:45 AM


New To Site? Need Help?

All times are GMT. The time now is 12:46 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