Onken mini for Fe108EZ - diyAudio
Go Back   Home > Forums > Loudspeakers > Full Range

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 2nd November 2005, 09:32 AM   #1
hth2412 is offline hth2412  Viet Nam
diyAudio Member
 
Join Date: Oct 2005
Send a message via Yahoo to hth2412
Default Onken mini for Fe108EZ

Hi,
I am going to make a bookshelf and I chosen FE 108EZ.
Is this Ok if I loaded in mini Onken cabinet ? as I supposed to have more bass.

Do you guy have any better idea or suggestions for the bookshelf enclosure ?

Your advise is highly appreciated.
Best regards
hth
  Reply With Quote
Old 2nd November 2005, 12:19 PM   #2
diyAudio Member
 
Josephjcole's Avatar
 
Join Date: Jun 2004
Location: Wisconsin
I'm not sure the 108e sigma is well suited for a ported enclosure due to its small size and lack of any real excursion capabilities. Maybe a larger fostex driver, or a 4" driver with a bit more x-max.
just my 2cents
Joe
  Reply With Quote
Old 2nd November 2005, 03:33 PM   #3
diyAudio Member
 
Join Date: Apr 2003
Location: Toulouse, France
Send a message via MSN to usa_satriani
The X08 are made for Horn speakers and do not suit Bass Reflex enclosures.

The X07 can be used in a bass reflex enclosure.

You know a Fostex Backhorn would make nice little speakers with a FE108EZ
__________________
"That's why we like you Mulder. Your ideas are weirder than ours."
  Reply With Quote
Old 2nd November 2005, 09:34 PM   #4
diyAudio Member
 
Bob Brines's Avatar
 
Join Date: Jan 2003
Location: Hot Spring Village AR
Default Re: Onken mini for Fe108EZ

Quote:
Originally posted by hth2412
Hi,
Is this Ok if I loaded in mini Onken cabinet ? as I supposed to have more bass.
The major feature of the Onken cabinet is that the port area equals the driver Sd. There are also some alignment issues, but you can Google "Onken" and do the reading. The problem with most modern drivers is that the Vas is too small to make the concept work. I have been looking specifically at the FE127E, and the required port length is 12-15" to tume to 70 Hz. This posses some difficulties with a 9.5 liter cabinet!

Bob
  Reply With Quote
Old 2nd November 2005, 11:20 PM   #5
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Greets!

Indeed! In Thuras's BR patent, which is where the original 'Onken/Ultraflex' is depicted, he states that Sd = Av was used strictly to simplify his electrical equivalent ckt. equations, but somewhere along the line it became 'gospel' as the ideal.

To keep the (13) vents short and tune it to the 12" nominal test driver's 40 Hz Fs, it had a ~15.84 ft^3 Vas, with only a 10 g Mms and a usable 50-10 kHz BW! My kind of wide BW driver. Unfortunately, few have survived.

Anyway, folks normally either and/or just keep increasing Vb until the vent length is managable and damp them as required or use an Av = Sd * 0.75 to 0.9.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 3rd November 2005, 01:45 PM   #6
hth2412 is offline hth2412  Viet Nam
diyAudio Member
 
Join Date: Oct 2005
Send a message via Yahoo to hth2412
Thank you all, for your advise.
The idea came when I visited planet_10 (http://www.planet10-hifi.com/css.html), when using driver Adire's FS125s for mini onken. I though If possible replaced FS125s by Fostex 108 EZ.

I had already BLH so that why I want a bookshelf .
  Reply With Quote
Old 3rd November 2005, 04:47 PM   #7
diyAudio Member
 
Roemhild's Avatar
 
Join Date: May 2005
Location: Stuttgart / Germany
Hi Hai,


I've got your mail and can say that the Fe108ES plays in around 6 liters closed or 12-13 liters BR.

here is a simulation with a horn for the the fostex with my method.

length: 0,55m
throat area: 30cm²
mouth area: 60*25 cm
rear chamber: 13 liters
exponetial


in a small room? why not? could be a try worth.


cya Till
Attached Images
File Type: jpg fe108sigma.jpg (27.2 KB, 489 views)
__________________
http://www.hornlautsprecher.de
  Reply With Quote
Old 3rd November 2005, 06:16 PM   #8
diyAudio Member
 
Join Date: Aug 2003
Location: Germany
Till,

interesting idea. What was the mouth alignment in your sim? Front/floor terminated?

Best regards,

Oliver
  Reply With Quote
Old 3rd November 2005, 06:30 PM   #9
diyAudio Member
 
Roemhild's Avatar
 
Join Date: May 2005
Location: Stuttgart / Germany
I am thinking of something like this.


I need more than 24h/day


Till
Attached Images
File Type: jpg fe108sigma_horn.jpg (9.8 KB, 472 views)
__________________
http://www.hornlautsprecher.de
  Reply With Quote
Old 3rd November 2005, 11:56 PM   #10
hth2412 is offline hth2412  Viet Nam
diyAudio Member
 
Join Date: Oct 2005
Send a message via Yahoo to hth2412
Quote:
Originally posted by Roemhild
Hi Hai,


I've got your mail and can say that the Fe108ES plays in around 6 liters closed or 12-13 liters BR.

here is a simulation with a horn for the the fostex with my method.

length: 0,55m
throat area: 30cm²
mouth area: 60*25 cm
rear chamber: 13 liters
exponetial


in a small room? why not? could be a try worth.


cya Till
Hi Till,
Thanks so much, I will try.
  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
L-pad for FE108EZ wixy Full Range 1 17th May 2008 03:15 PM
Mini Onken clone driver question DUC985 Multi-Way 18 12th October 2007 01:05 PM
FE108EZ or 168? vexator Full Range 12 7th January 2006 02:49 PM
Mini Onken in Dalmatian finish Franz G Multi-Way 7 30th May 2005 12:05 PM


New To Site? Need Help?

All times are GMT. The time now is 12:14 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