First Crossover attempt - 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 11th April 2008, 04:01 AM   #1
diyAudio Member
 
Join Date: Nov 2005
Default First Crossover attempt

This is my first attempt at designing my own crossover. It's pretty horrible, but honestly, I don't know what I'm doing. This is an attempt at teaching myself what to do. It's a theoretical build on a system I'd love to put in my car someday parents, money, and time permitting. I'd love to have suggestions on what I should be doing differently.

I'm using the Dayton Reference RS225-4, the Dayton Reference RS52AN, and the Tang Band 1166SJ as my model drivers.

Here is a picture of the crossover.
Attached Images
File Type: gif crossover.gif (11.3 KB, 203 views)
  Reply With Quote
Old 11th April 2008, 04:05 AM   #2
diyAudio Member
 
Join Date: Nov 2005
Here's a picture of the frequency response I've been able to attain.
Attached Images
File Type: gif frequency.gif (9.8 KB, 186 views)
  Reply With Quote
Old 11th April 2008, 04:08 AM   #3
diyAudio Member
 
Join Date: Nov 2005
I'm looking for advice on what I should be doing, how to go about arranging my crossover, and most importantly, why it should be done. I've tried reading tutorials online, but most of them stop with the basic textbook crossovers. Very little is taught about what to do to tweak the design. Sorry if this seems a bit basic, but I learn best when I can ask questions on things I don't understand (can't really do that on a published web article). Thanks for any advice.
  Reply With Quote
Old 11th April 2008, 12:51 PM   #4
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
http://www.rjbaudio.com/Audiofiles/FRDtools.html
http://www.geocities.com/woove99/Spkrbldg/

http://www.zaphaudio.com/
http://www.rjbaudio.com/projects.html
http://www.troelsgravesen.dk/Diy_Lou...r_Projects.htm
http://www.humblehomemadehifi.com/
http://htguide.com/forum/forumdisplay.php4?f=39

also take note of : http://www.zaphaudio.com/ZDT3.html

/sreten.
__________________
There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow
  Reply With Quote
Old 11th April 2008, 03:31 PM   #5
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
An interesting a good first try...shouldnt be too hard to make it a bit better

First you need attenuation on mid driver

I dont understand why you have 12uf before series inductor on mid lowpass

You may not need such steep filter slopes
__________________
sometimes we know very little, and sometimes we know too much
  Reply With Quote
Old 11th April 2008, 05:44 PM   #6
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Quote:
Originally posted by tinitus


I dont understand why you have 12uf before series inductor on mid lowpass

Hi, because he has not simmed the amplifier melting input impedance, /sreten.
__________________
There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow
  Reply With Quote
Old 11th April 2008, 05:54 PM   #7
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
Quote:
Originally posted by sreten


Hi, because he has not simmed the amplifier melting input impedance, /sreten.
Smoke on the water.... Ouch... Nice not so little capacitive load directly on the output of the amplifier.. I seriously doubt any car amplifier would survive long with that load connected to it.
__________________
"Extraordinary claims require extraordinary evidence." - Carl Sagan
  Reply With Quote
Old 11th April 2008, 06:12 PM   #8
joetama is offline joetama  United States
diyAudio Member
 
Join Date: Feb 2008
I understand the want to learn how to build a crossover.

But, Since you are putting this in a car why not just go active.

Are you planning on running a subwoofer also?

Because if you aren't a lot of good headunits (which you probably already own) will do a 3-Way system pretty nicely.

In my car I have a fully active 3-way system. It is nice to be able to tune delay and change things on the fly.

Just my $0.02.
  Reply With Quote
Old 11th April 2008, 06:55 PM   #9
badman is offline badman  United States
diyAudio Member
 
badman's Avatar
 
Join Date: Sep 2003
Location: Sunny Tustin, SoCal
Quote:
Originally posted by sreten


Hi, because he has not simmed the amplifier melting input impedance, /sreten.

Guys, that's why he's asking.

Lightwavedude:

What they're talking about is that you have 2 capacitors on the midrange that would cause the amplifier to see a short at some high frequency (coupla khz).

This will kill many MANY amps.

On the woofer, I take it Cz1 and Rz1 are for impedance compensation? If so, Cz1 is way too small, 10pF is a negligible capacitance. 10-100 uF range is more appropriate.

I would omit the woofer resistor.

There are a lot of other issues here, including the location of what appears to be a parallel notch filter on the mid. That with the inductor and cap to ground, in parallel, is what's causing the short.

Your phase response is all over the place. Did you pick values, assemble what 'looked good', and then simulate it for as flat an amplitude response you could get? If so, that's not the way to design a crossover. Existing topologies are available to help you get a better performing loudspeaker. You already have the drivers simulated so you just need to plug in some calculated values for a 'normal' crossover, and tweak the values to match the characteristics of the speakers in your simulation.

I'd suggest starting with a tried and true speaker/crossover design, such as one from www.zaphaudio.com, and also some time spent researching. The links sreten gave are good, spend some time reading, looking at various crossovers with various speaker combinations, play around with your software.

A book every speaker builder of any sort should keep on hand is vance dickason's loudspeaker design cookbook. Not just a summary of designs, it has many practical studies, explanation of theory, and other content. I believe the 6th edition is on blowout at www.madisound.com
__________________
I write for www.enjoythemusic.com in the DIY section. You may find yourself getting a preview of a project in-progress. Be warned!
  Reply With Quote
Old 11th April 2008, 08:37 PM   #10
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
I definitely second badmans recommendation of Vance Dickasons book. Highly recommended.
__________________
"Extraordinary claims require extraordinary evidence." - Carl Sagan
  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
My ESL attempt SM7UYJ Planars & Exotics 144 4th March 2010 02:22 PM
My first attempt mikee55 Chip Amps 4 26th March 2006 12:16 AM
Horrible crossover attempt. Netlist Multi-Way 12 2nd October 2004 09:52 PM
for my first attempt : Magnetmaz Pass Labs 13 19th November 2002 10:23 PM


New To Site? Need Help?

All times are GMT. The time now is 02:04 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