Suitable Tweeter for Fountek FW146 5.5" - 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 17th January 2013, 02:31 AM   #1
haryojo is offline haryojo  Indonesia
diyAudio Member
 
Join Date: Nov 2010
Default Suitable Tweeter for Fountek FW146 5.5"

Hi dear
I want to build a 2 way bookshelf speaker with an existing driver: Fountek FW146 5.5 "Aluminum Cone Woofer. but, the tweeter not ready. Does any one can help me, which tweeter to match the woofer . tks all
  Reply With Quote
Old 17th January 2013, 02:51 AM   #2
diyAudio Member
 
tuxedocivic's Avatar
 
Join Date: Jan 2011
Location: Ladysmith, BC
Depends on your objectives. I'd probably use a small dome neo like the sb29rdcn
  Reply With Quote
Old 17th January 2013, 03:06 AM   #3
diyAudio Member
 
Bob Richards's Avatar
 
Join Date: Feb 2011
Location: Portland Oregon, USA
The trouble with metal cone woofers is that they have severe resonance, usually in the upper midrange, right where the ear is most sensitive. So high order crossovers are usually necessary, to attenuate energy any where near that frequency, or using a very low frequency crossover point.
  Reply With Quote
Old 17th January 2013, 03:21 AM   #4
ScottG is offline ScottG  United States
diyAudio Member
 
Join Date: Feb 2003
Location: US
The Fountek FW146 has "peaking" of about 10 db at 10 kHz. The good news however is that it's NOT a resonance, it's just more efficient at the top of it's passband.

http://techtalk.parts-express.com/at...1&d=1263085287

It is however a 5.5" driver - so its off-axis performance (with its phase-plug) will start becoming a problem a bit above 2 kHz.

So there is a choice to make here:

1. let it run nearly full-range with a correction filter and a tweeter crossed over high that has limited dispersion, OR

2. crossover low with a more "robust" tweeter allowing for greater horizontal dispersion.


For #1:

Products_Fountek Electronics Co.,Ltd

or

H1499-06 27TBCD/GB-DXT


for #2:

Trans Lab, N26C-X



Both solutions will need higher order crossovers. The easier solution will be the second because it will require less work with the crossover.
__________________
perspective is everything
  Reply With Quote
Old 17th January 2013, 07:21 AM   #5
joern is offline joern  Europe
diyAudio Member
 
Join Date: Feb 2008
Hi

here ist a nice fit:
Skunk - DIY-HIFI-Forum
try some google translater from german to your language.
__________________
Regards
Jörn
  Reply With Quote
Old 17th January 2013, 08:26 AM   #6
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Quote:
Originally Posted by ScottG View Post
The good news however is that it's NOT a resonance,
it's just more efficient at the top of it's passband.
Hi,

Not true. It is metal cone breakup and a too high
crossover will have poor distortion performance.

Zaph|Audio

Shows one way of dealing with it, but needs
careful design to hit the target acoustic slopes.

rgds, 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 17th January 2013, 10:55 AM   #7
6.283 is offline 6.283  Germany
diyAudio Member
 
Join Date: Aug 2008
Location: Black Forest
Quote:
Originally Posted by sreten View Post
Hi,

Not true. It is metal cone breakup and a too high
crossover will have poor distortion performance.

Zaph|Audio

Shows one way of dealing with it, but needs
careful design to hit the target acoustic slopes.

rgds, sreten.
Hi sreten,

the FW 146 is, however, much better than the Seas in this respect. I did not believe it myself but our two German DIY speaker magazines have reviewed and measured it (one with Clio and one with MLSSA) and there are virtually ZERO distortion issues from break up. In total, distortion (as measured by these two systems) is very low. Quite amazing for the price tag (or the wrong excitation signal but that would be another discussion).

However, I believe it starts beaming pretty early for a 5". So that would be the reason why I would cross rather low to a tweeter (in order to match the directivity).
__________________
2Pi-online.de

Last edited by 6.283; 17th January 2013 at 11:07 AM.
  Reply With Quote
Old 17th January 2013, 01:06 PM   #8
6.283 is offline 6.283  Germany
diyAudio Member
 
Join Date: Aug 2008
Location: Black Forest
Quote:
Originally Posted by 6.283 View Post
However, I believe it starts beaming pretty early for a 5". So that would be the reason why I would cross rather low to a tweeter (in order to match the directivity).
Or use a tweeter in a waveguide like this

Waveguide WG 148 R

or this

H1499-06 27TBCD/GB-DXT
__________________
2Pi-online.de
  Reply With Quote
Old 17th January 2013, 07:38 PM   #9
ScottG is offline ScottG  United States
diyAudio Member
 
Join Date: Feb 2003
Location: US
Quote:
Originally Posted by sreten View Post
Hi,

Not true. It is metal cone breakup and a too high
crossover will have poor distortion performance.



rgds, sreten.

Its behavior is still quite linear (as shown in the CSD). This is NOT break-up as in a traditional lack of mass control, or "bell" mode resonance.

Its non-linear behavior also shows no significant effect other than a boost in 2nd order distortion commensurate with the elevation in spl as it becomes more efficient:

http://techtalk.parts-express.com/at...1&d=1263263086
__________________
perspective is everything

Last edited by ScottG; 17th January 2013 at 07:44 PM.
  Reply With Quote
Old 17th January 2013, 08:07 PM   #10
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Hi,

The SPL boosts effects on distortion for metal driver peaks are well known,
and inevitable, even if absolute level is acceptable, the effect is still there.

I don't really want to argue about what the large top end peak is,
to a degree, what you think it is will decide your approach to it.

I like the elliptical / Caeur approach, usually a 1st order baffle step inductor
followed by a second order notch filter, tuned to the peak, and Q carefully
arranged to create the right acoustic slope around the crossover region.
Requires careful design and might turn out not to be the right approach.

rgds, sreten.

Its a monster of a peak at the top end, around one particular frequency,
so ideally suited to Zaphs strategy as outlined by him in the article :

Click the image to open in full size.
__________________
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

Last edited by sreten; 17th January 2013 at 08:13 PM.
  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
Another best buy- Fountek FW146 DYNABLASTERTUNERS Full Range 12 30th December 2011 09:42 PM
Fountek JP3.0 ribbon tweeter - NIB cdoggy81 Swap Meet 4 29th October 2008 04:15 AM
Fountek JP-2.0 5" ribbon tweeter pair mazeroth Swap Meet 2 23rd May 2007 12:48 AM
suitable 10" woofer and tweeter for this amp?... lunchmoney Multi-Way 0 5th April 2005 07:28 PM
How to mount the Fountek JP-2.0 5" tweeter? mazeroth Multi-Way 2 18th January 2005 03:03 AM


New To Site? Need Help?

All times are GMT. The time now is 09:10 PM.


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