Adding a rear-firing tweeter - 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 18th October 2012, 08:43 AM   #1
Nuuk is offline Nuuk  United Kingdom
diyAudio Member
 
Nuuk's Avatar
 
Join Date: Feb 2003
Location: Somerset, SW England
Default Adding a rear-firing tweeter

What is the correct wiring when adding a rear firing tweeter.

I currently have a tweeter with just a single 0.47 uFd cap as crossover. I want to add a rear firing tweeter but what is the correct way to wire it in?

Is this correct?

Click the image to open in full size.
__________________
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
  Reply With Quote
Old 18th October 2012, 09:44 AM   #2
Rudolf is offline Rudolf  Germany
diyAudio Member
 
Rudolf's Avatar
 
Join Date: Mar 2003
Location: Germany
Above is for bipole operation. If you want a dipole, you should invert the rear tweeter connections. Which of both is "correct" can not be decided without further information about your system and room situation.

Rudolf
__________________
www.dipolplus.de
  Reply With Quote
Old 18th October 2012, 09:50 AM   #3
diyAudio Member
 
picowallspeaker's Avatar
 
Join Date: Apr 2007
0u47 F is very little ...
It should start to cut frequencies under 20 KHz for an 8Ω tweeter

It might be good for the rear tw, surely ..but for the front REAL one ?
  Reply With Quote
Old 18th October 2012, 10:57 AM   #4
Nuuk is offline Nuuk  United Kingdom
diyAudio Member
 
Nuuk's Avatar
 
Join Date: Feb 2003
Location: Somerset, SW England
Quote:
Originally Posted by Rudolf View Post
Above is for bipole operation. If you want a dipole, you should invert the rear tweeter connections. Which of both is "correct" can not be decided without further information about your system and room situation.

Rudolf
Sorry Rudolf, I should have said that this is for an open baffle speaker with the full-range drivers being (modified for OB use) Goodmans 201's.

So I guess that I should wire for dipole rather than bipole.
__________________
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
  Reply With Quote
Old 18th October 2012, 11:00 AM   #5
Nuuk is offline Nuuk  United Kingdom
diyAudio Member
 
Nuuk's Avatar
 
Join Date: Feb 2003
Location: Somerset, SW England
Quote:
Originally Posted by picowallspeaker View Post
0u47 F is very little ...
It should start to cut frequencies under 20 KHz for an 8Ω tweeter

It might be good for the rear tw, surely ..but for the front REAL one ?
They are actually Supertweeters (Realistic 40-1310) and I have also been confused that they have so much audible output with just a 0.47 cap.
__________________
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
  Reply With Quote
Old 18th October 2012, 11:28 AM   #6
diyAudio Member
 
picowallspeaker's Avatar
 
Join Date: Apr 2007
If it's audible it's not a supertweeter
  Reply With Quote
Old 18th October 2012, 12:06 PM   #7
Nuuk is offline Nuuk  United Kingdom
diyAudio Member
 
Nuuk's Avatar
 
Join Date: Feb 2003
Location: Somerset, SW England
Quote:
Originally Posted by picowallspeaker View Post
If it's audible it's not a supertweeter
They are if you're a bat!
__________________
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
  Reply With Quote
Old 18th October 2012, 12:18 PM   #8
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
Quote:
Originally Posted by Nuuk View Post
Sorry Rudolf, I should have said that this is for an open baffle speaker
so I guess that I should wire for dipole rather than bipole.
probably
just be aware that you introduce other phase errors as well
tho a super tweeter sounds easy, it really isn't
and it can really make you pull your hair out
once you have heard it, you want it so bad because it just sounds so bloddy good
and yet you still can't make it work good enough to let it say in the system
now I have warned you
  Reply With Quote
Old 18th October 2012, 12:42 PM   #9
Rudolf is offline Rudolf  Germany
diyAudio Member
 
Rudolf's Avatar
 
Join Date: Mar 2003
Location: Germany
Quote:
Originally Posted by Nuuk View Post
Sorry Rudolf, I should have said that this is for an open baffle speaker with the full-range drivers being (modified for OB use) Goodmans 201's.
So I guess that I should wire for dipole rather than bipole.
You should try both versions. I don't know where the tweeters come in, but at say >4 kHz the difference between bi- and dipole becomes moot anyway. You may want to attenuate the rear tweeter somewhat depending on the character of the front wall reflection. But - as Tinitus mentioned - it is always a good idea to have it in the first place

Rudolf
__________________
www.dipolplus.de
  Reply With Quote
Old 18th October 2012, 01:27 PM   #10
Nuuk is offline Nuuk  United Kingdom
diyAudio Member
 
Nuuk's Avatar
 
Join Date: Feb 2003
Location: Somerset, SW England
Thanks guys. I was aware of the problems with using dipole tweeters. But isn't it the same with nearly all hi-fi - there's is usually a compromise somewhere!

I can certainly cobble in some attenuation but first I must decide on which tweeters to use for the rear.
__________________
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
  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 wiring rear firing tweeter? bigaudioscotto Full Range 8 16th July 2012 08:10 PM
Down-Firing or Rear Ports? villeneuve Subwoofers 10 22nd April 2009 04:37 AM
Adding a rear Ambience tweeter Jamesuk1 Full Range 4 23rd October 2008 05:55 PM
what is the impact of having a rear firing port peteS Multi-Way 8 4th March 2006 03:43 AM
rear firing tweeter - why? bbaker6212 Multi-Way 5 25th September 2002 12:50 PM


New To Site? Need Help?

All times are GMT. The time now is 10:16 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