Decided first project to be center channel - 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 15th January 2004, 04:18 PM   #1
diyAudio Member
 
Join Date: Jan 2004
Location: Texas
Default Decided first project to be center channel

I believe I want my first real DIY speaker project to be a center channel. This is the speaker I listen to most often, and it will offer the most learning experiences for me.

I have decided on a WMTW design, I have a fairly small amount of space to use, and a small budget as well. It will need to be shielded as well.

T TB 28-8485A Tweeter, 2nd or 3rd order at 4KHz
M TB W3-879S 3" 2nd or 3rd order bandpassed from 350Hz to 4Kz (is a bandpass advisable?)
2xW TB W5-876SA 5" 2nd order Low-Pass at 350Hz.

This should run abuot 75 for the drivers, and I would like to stay under 15 or so for the crossover. From what I have been learning, the impedence and freq response curves should work nicely at these crossover ferquencies, though I will use WINISD to verify this.

Thumbs up, or am I way off bass (pun intended) here?

BTW I intend on replacing the mains to match this setup later on down the road, they are currently low rate Pioneers...
  Reply With Quote
Old 15th January 2004, 04:29 PM   #2
diyAudio Member
 
leadbelly's Avatar
 
Join Date: Dec 2002
Location: Calgary, Alberta
Default Re: Decided first project to be center channel

Quote:
Originally posted by tacomaboy
I have decided on a WMTW design

This should run abuot 75 for the drivers, and I would like to stay under 15 or so for the crossover
Good idea on the WMTW design, as lots of people feel putting voice smack on 1 driver works best for a CC.

But $15 for the crossover? You'll spend more that that on just the inductors.
__________________
Aerodynamics are for people who can't build engines. Enzo Ferrari
  Reply With Quote
Old 15th January 2004, 04:33 PM   #3
diyAudio Member
 
Join Date: Jan 2004
Location: Texas
Yes you are right. I was just looking through the PE pre made Xovers and they run 40 bucks. Still, that would total 115 for a very nice center channel.

Previously I had been looking at a 300 dollar Inifinity CC and I dont think it would sound nearly as nice.

Plus I could later match these with a TW or TMW mains and TM surrounds...
  Reply With Quote
Old 15th January 2004, 05:42 PM   #4
Zymrgy is offline Zymrgy  United States
diyAudio Member
 
Join Date: Jan 2004
Location: Utah, USA
I am also very new to speaker building...and I would also like to build a CC. I have recently learned that my original thought of copying the popular MTM is not the way to go. I also was thinking of the WMTW configuration...when I thought of using a couple coaxial speakers instead....like what is seen in car audio.

I know that a speaker company (I think B&W) has done a simillar thing....

Any thoughts on this????
  Reply With Quote
Old 15th January 2004, 06:03 PM   #5
darkm4n is offline darkm4n  Romania
diyAudio Member
 
darkm4n's Avatar
 
Join Date: Aug 2003
Location: Bucharest
Send a message via ICQ to darkm4n Send a message via MSN to darkm4n Send a message via Yahoo to darkm4n
If this is you first DIY project .. be carefull .. be very carefull ...
www.spearkplans.com may help .

Be carefull to join all the board's corectly , to cut them good ... i recomand that someone else to cut them ...

Good luck !! Bye
  Reply With Quote
Old 15th January 2004, 06:21 PM   #6
diyAudio Member
 
Join Date: Jan 2004
Location: Texas
This will be my first Xover design, but cutting isnt an issue. I have built boxes before and they came out very nice.

I think for the 3 way X over I will do like so:

[edit I tried to ASCII art it, but forget it]

First order Mid/Woof Xover
C1 39.8uF //High pass 500Hz
L1 1.82uH //Low pass 350Hz

Second Order Mid/Tweet Xover
C2 3.517UF //2nd order HP 4KHz
L2 .45uH

C3 4.193uF //2nd order LP 3.5KHz
L3 .51uH

Parts should run about 30 bucks

Does this sound right?

Looking at the impedence graphs, it *should* average out to 8ohms across the board. What is a good software program to use ro add the freq response and inpedence response graphs?

By the way, I could save alot of money by replacing C1 with a cheap electrolytic cap. Would I notice the difference??
  Reply With Quote
Old 15th January 2004, 06:27 PM   #7
diyAudio Member
 
leadbelly's Avatar
 
Join Date: Dec 2002
Location: Calgary, Alberta
Quote:
Originally posted by Zymrgy
I also was thinking of the WMTW configuration...when I thought of using a couple coaxial speakers instead....like what is seen in car audio.
If you like WTMW, the Audax CC looks good:

http://design3d.host.sk/Hi-Fi/Audax/ht_center.htm

If you like coax, Tony Gee's USB looks good:

http://home.hetnet.nl/~geenius/USB.html
__________________
Aerodynamics are for people who can't build engines. Enzo Ferrari
  Reply With Quote
Old 15th January 2004, 07:29 PM   #8
diyAudio Member
 
Timn8ter's Avatar
 
Join Date: Jul 2003
Location: Seattle, WA
Quote:
Looking at the impedence graphs, it *should* average out to 8ohms across the board
Impedance may be ok but what about sensitivity?
  Reply With Quote
Old 15th January 2004, 07:34 PM   #9
diyAudio Member
 
Join Date: Jan 2004
Location: Texas
Quote:
Originally posted by Timn8ter

Impedance may be ok but what about sensitivity?

... meaning the sensitivity of the tweet as opposed to the midrange?

Well, I am still learning, so my guess (and I am asking for input here) that I would need a resister to pad the tweeter or an L-pad (and I have never used an L-pad). Whats the best way to determine resistance needed or what sort of L-pad I would need?

Also, I am not sure how to handle the Woofers in this case. They are going to be run parallel at 4ohms, and I know larger speakers are less efficient, so I would assume this would make up for that (having two in parallel). Oh, but then I would underload my amp.

Well, thats why I am here I guess. I plan on getting the LoudSpeaker CookBook before I begin of course.

Or, I could just buy the prebuild Dayton Crossover. Would that be the better way? I really would prefer to do it myself...
  Reply With Quote
Old 15th January 2004, 07:45 PM   #10
diyAudio Member
 
Join Date: Jan 2004
Location: Texas
Oh, you mean the frequecny response when you say sensitivity? To me it looks like it will flatten, but I will have to use software to be sure, right?
  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 Hi-VI B3S Bipole Center Channel Project owdi Full Range 14 28th April 2007 01:00 AM
Center Channel Project finished after nearly a year of work. kingdaddy Multi-Way 8 29th November 2005 02:48 PM
MTM center channel project Deagle50ae Multi-Way 23 15th March 2005 06:54 AM
New Center Channel Project scooterdog Multi-Way 0 30th March 2003 08:44 PM
Center Channel project ssurban Multi-Way 2 8th January 2003 03:19 AM


New To Site? Need Help?

All times are GMT. The time now is 03:27 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