Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Multi-Way Conventional loudspeakers with crossovers

Ambience tweeters?
Ambience tweeters?
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 17th June 2005, 04:40 AM   #1
Audiophilenoob is offline Audiophilenoob  United States
diyAudio Member
 
Join Date: May 2005
Location: NC
Default Ambience tweeters?

you know there's not a single thread on these????

what are the pros and cons of an ambience tweeter rear firing in a speaker tower?

how would one impliment this?

it's a very rare design to see in high end audio
  Reply With Quote
Old 17th June 2005, 09:26 AM   #2
jaudio is offline jaudio
diyAudio Member
 
Join Date: Oct 2004
The sound is hard to describe. I guess one could say a wider stage. I used a cone tweeter in the rear and a dome in front. I crossover the cone tweeter just a little lower than the dome,then adjusted the volume on the cone until I was happy with the level.

It would be a good idea to use a l-pad and a off on switch on the rear tweeter.
  Reply With Quote
Old 17th June 2005, 10:01 AM   #3
michaelpage26 is offline michaelpage26  Greece
diyAudio Member
 
Join Date: Mar 2004
Location: Athens
Here are some high end designs that use rear firing tweeters/ribbons:

HGP Lyra SoNova
Triangle Stratos Australe
Triangle Stratos Volante
Triangle Stratos Magellan
Von Schweikert Audio VR-9SE (see pic)
Von Schweikert Audio DB-99 MK II
Von Schweikert Audio VR-11 XTC
North Creek Music Manifest
Attached Images
File Type: jpg vr-9se.jpg (15.1 KB, 575 views)
  Reply With Quote
Old 17th June 2005, 01:46 PM   #4
Audiophilenoob is offline Audiophilenoob  United States
diyAudio Member
 
Join Date: May 2005
Location: NC
Quote:
Originally posted by michaelpage26
Here are some high end designs that use rear firing tweeters/ribbons:

HGP Lyra SoNova
Triangle Stratos Australe
Triangle Stratos Volante
Triangle Stratos Magellan
Von Schweikert Audio VR-9SE (see pic)
Von Schweikert Audio DB-99 MK II
Von Schweikert Audio VR-11 XTC
North Creek Music Manifest

that's a very beautiful speaker...

good call with the on off switch....

should an ambience tweeter be the same tweeter as the front? or should it be smaller/larger...?

the Wilson Alexandria uses a 3/4" supertweeter for ambience... so should it be more efficent/powerful than the front?
  Reply With Quote
Old 17th June 2005, 02:04 PM   #5
troystg is offline troystg  United States
diyAudio Member
 
troystg's Avatar
 
Join Date: Apr 2004
Location: In a dream, Please don't wake me...
Quote:
Originally posted by jaudio

It would be a good idea to use a l-pad and a off on switch on the rear tweeter.

Parts express was selling input terminals with bi-amp inputs, a switch and an L-pad in one "cup".

They were dirt cheap so I bought 4-6 of them just to try out this very idea.

Maybe you can find some of those to try it out.
__________________
Troy
Thinking positive doesn't make things better, it makes you a better person.
  Reply With Quote
Old 17th June 2005, 02:19 PM   #6
jaudio is offline jaudio
diyAudio Member
 
Join Date: Oct 2004
Quote:
Originally posted by Audiophilenoob



should an ambience tweeter be the same tweeter as the front? or should it be smaller/larger...?
Normally yes but not always. The reasonl I used the cone tweeter is it had a lower crossover point,so I got more midrange


Quote:
Originally posted by Audiophilenoob


the Wilson Alexandria uses a 3/4" supertweeter for ambience... so should it be more efficent/powerful than the front?
Equal to or less that why it is a good idea to use a L-pad
  Reply With Quote
Old 17th June 2005, 02:57 PM   #7
Mr Evil is offline Mr Evil  United Kingdom
diyAudio Member
 
Join Date: Aug 2004
Location: Behind you
Quote:
Originally posted by michaelpage26
...Von Schweikert Audio VR-9SE (see pic)
It's a Dalek!
__________________
https://mrevil.asvachin.eu/
  Reply With Quote
Old 17th June 2005, 09:56 PM   #8
michaelpage26 is offline michaelpage26  Greece
diyAudio Member
 
Join Date: Mar 2004
Location: Athens
I don't have any experience with ambience tweeters, but it seems that the front firing tweeter is larger or the same size compared to the rear firing. One example is the North Creek Music Manifest. It uses for front firing tweeters the Aurum Cantus G1s while for ambience tweeters it uses the smaller Aurum Cantus G2is. Also an intresting note is that the ambience tweeter is mounted horizontally (see pic)!

P.S. I didn't know that the Wilson X-2 Alexandrias had ambience tweeter!
Attached Images
File Type: jpg lee_back_view.jpg (69.2 KB, 473 views)
  Reply With Quote
Old 18th June 2005, 05:45 AM   #9
BassAwdyO is offline BassAwdyO  United States
diyAudio Member
 
BassAwdyO's Avatar
 
Join Date: Jun 2004
Location: Illinois
Send a message via AIM to BassAwdyO
my question is this... Do you use them as normal or reversed polarity? Bipole, or Dipole that is...

Does it matter?

how about side firing ambience tweeters?



sounds like a good way to smear all the detail for me... What are the advantages again?
__________________
The golden rule of DIY:
Build nice, or build twice!
  Reply With Quote
Old 18th June 2005, 07:10 AM   #10
DSP_Geek is offline DSP_Geek  Canada
diyAudio Member
 
Join Date: Aug 2003
Location: Santa Cruz, California
Quote:
Originally posted by BassAwdyO
my question is this... Do you use them as normal or reversed polarity? Bipole, or Dipole that is...

Does it matter?

how about side firing ambience tweeters?



sounds like a good way to smear all the detail for me... What are the advantages again?

Part of the rationale for extra drivers is to equalise the power response to somewhere near flat. Directivity increasing with frequency for tweeters means the diffuse field tends to roll off in the upper range of those drivers. This is curable by increasing the diffuse power by crossing in a supplementary tweeter firing well off-axis; typically the frequency response is shaped by adding another small capacitor between the high pass crossover and the ambience tweeter so its -3 dB point is at some high frequency, say around 10 kHz. Wilson Grand Slamms use that very technique in their rear-facing ambience driver. I might add that somewhat flat room response is part of the magic around dipoles: the nonflat off-axis response is diminished at 90 degrees, or precisely the angle where high frequency rolloff is most severe.

As it turns out, you can get to a good start by calculating the Zobel capacitor for the main tweeter and using that value with a properly Zobeled ambience tweeter to get a decent first try at setting the proper crossing in for the ambience driver, assuming similar efficiencies and responses. You also have the advantage of being able to use a smaller rear tweeter since the high -3 dB point reduces power demands further down the spectrum, where the main tweeter does a good job of filling the room anyway.


Francois.
  Reply With Quote

Reply


Ambience tweeters?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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Adding a rear Ambience tweeter Jamesuk1 Full Range 4 23rd October 2008 05:55 PM
synthetic ambience eStatic Digital Source 33 15th June 2008 12:10 PM
Rear mounted ambience drivers, opinions? ptwining Multi-Way 5 20th December 2007 04:41 PM
Dolby surround for ambience synthesis rick57 Everything Else 16 24th May 2006 10:32 PM
Old system with Ambience. eStatic Multi-Way 0 14th December 2003 08:14 PM


New To Site? Need Help?

All times are GMT. The time now is 03:22 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki