Making a two way - 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 21st February 2009, 03:15 PM   #1
diyAudio Member
 
Join Date: Feb 2009
Default Making a two way

Hi. I'm a newbie that I like to build a baffle for see films , play games, and sometimes listen music in mi PC. I have have four woofers of 6" and two piezoelectric tweeters. I like to use ONLY IT, and not buy other woofers/tweeter of better quality.

I get the Thiel-Small parameters of the woofers using a polymeter, a amp of 40W and mi PC like signal generator.

-Best 6" Woofers (Brand X, that come which my actual 40W+40W Amp)
Rmax Re R0
17,64 3,4 7,74

QTS 0,4
QMS 7
QES 0,42

F1 52
F2 94
Fs 70

Calculated VAS (if i do well) = 20,45 L
GRaph :
Click the image to open in full size.

-6" Woofers from a baffle set for car (Brand Y)

Rmax Re R0
13,33 4,3 7,57

QTS 1,1
QMS 14,6
QES 1,18

F1 67
F2 87
Fs 80

Calculated VAS (if i do well) = 14,49 L
Graph:
Click the image to open in full size.

-Piezo Tweeters which small horn (of the same baffle set)
Graph of Impedance
Click the image to open in full size.

So, my questions is... how I calculate the crossover filters (the crossover frequency), and how pretty well it's WinISD to obtain the size for the baffles. I use to get a baffle of 19,8L which the "bad" woofers, but I compared which a old book of radio, tv and audio electronics and it's says that for a 6" bass reflex baffle, i need nearly x2 size.

Plus I listen that there possible build a subwoofer using two 6" loudspeakers ? How nice works it ? It will sound good if I use my two best woofers for build a "subwoofer" and the other two woofers which the tweeters to make a mid/high baffles and setting a 2.1 audio system ?
  Reply With Quote
Old 21st February 2009, 06:23 PM   #2
mikje is offline mikje  United States
Soakin' up the Sound!
diyAudio Member
 
mikje's Avatar
 
Join Date: Feb 2008
Location: Bismarck, ND
Zardoz,
I don't know if you've seen them, but here are a couple of links with a lot of good info. Maybe you can find your answer within them.

http://www.lautsprechershop.de/tools/index_en.htm

http://www.the12volt.com/caraudio/crosscalc.asp#ccc

Mike
__________________
Marantz PM8003 amp, Jolida SJ502A, Squeezebox Touch, MLTL Continuums, DIY Carmichaels (Dayton, TangBand, Vifa); MarkAudio A 7.3 Frugalhorns, MarkAudio CHP-70s
  Reply With Quote
Old 21st February 2009, 08:59 PM   #3
diyAudio Member
 
Join Date: Feb 2009
The second link, I know it. The other not. Thanks!

But what frecuency i need to use in the crossover filter
  Reply With Quote
Old 22nd February 2009, 01:55 AM   #4
mikje is offline mikje  United States
Soakin' up the Sound!
diyAudio Member
 
mikje's Avatar
 
Join Date: Feb 2008
Location: Bismarck, ND
Zardoz,

I'm new at DIY speakers too, but I'll answer as best I can.

First, with a piezo, you don't need a crossover. You can use one if you'd like, but it isn't necessary.

I think the crossover frequency, if you decide to go with one, depends on your woofer and tweeter parameters. Without knowing their frequency ranges, I don't know at what frequency you should crossover.

Some folks that use a piezo put a 4 uf capacitor in series with it and are quite happy with that arrangement. You can experiment with different value caps if you have some available; they're pretty inexpensive.

Hope this helps.

Mike
__________________
Marantz PM8003 amp, Jolida SJ502A, Squeezebox Touch, MLTL Continuums, DIY Carmichaels (Dayton, TangBand, Vifa); MarkAudio A 7.3 Frugalhorns, MarkAudio CHP-70s
  Reply With Quote
Old 22nd February 2009, 08:26 PM   #5
diyAudio Member
 
Join Date: Feb 2002
Location: Western Sydney
post #6 in this thread will tell you how to connect piezos:

How do these piezo tweeters work?
__________________
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
Old 22nd February 2009, 08:46 PM   #6
diyAudio Member
 
Join Date: Feb 2009
I was reading about piezos, and I know that are like a capacitor and can be used without crossoover ( I just get fro ma cheap baffle that have it in parallel which the woofer!). But at same time, I read that It best for the woofer and sound quality using a 2 orden crossover filter. Mainly it increases woofer life and sound quality of high tones, because a woofer trying to play 4000 Hz and above sounds sound ugly , etc...

I put the impedance graphs of the loudspeakers, because I not have idea of what freq I need set the crossover to work well and I'm asking help about it

I read that some people put a resistor in parallel o in series which the piezo tweeter
  Reply With Quote
Old 23rd February 2009, 12:40 AM   #7
diyAudio Member
 
Join Date: Feb 2002
Location: Western Sydney
where you say ''baffle'' I think you mean ''box''

to decide on xover freq, we need freq response graphs,

Re: ''a woofer trying to play 4000 Hz and above sounds sound ugly'' - but you've limited your choice to this by using piezos

re:''It best for the woofer and sound quality using a 2 orden crossover filter'' - depends on the combination of drivers, once again we need freq. response graphs to decide this

I'd try the woofer that responds highest with the piezo, - easy (& cheap) to try, and then add a 1st order (coil in series) on the woofer

neither of those woofers will go very low, so no good for sub,
but try them in an EBS alignment in WINISD
__________________
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
Making PCB's audioPT Parts 12 3rd April 2012 05:40 PM
Making your own PCB's pjpoes Parts 15 6th July 2007 08:44 PM
I am really bad at making PCB's triden Parts 20 25th March 2006 07:12 AM
Making of M1 macgyver Multi-Way 2 4th July 2003 01:50 PM
Making of M1 macgyver Multi-Way 1 28th August 2002 06:59 PM


New To Site? Need Help?

All times are GMT. The time now is 03:18 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