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 26th January 2006, 05:38 PM   #1
LilMik is offline LilMik  Germany
diyAudio Member
 
Join Date: Jun 2004
Location: germany
Question Is the FE 108EZ a bad Driver?

hello all,

i want to build the 108ez recommended enclosure, but a german maganzin (klang & ton) recently tested the driver and said that it is useless for hifi. the driver has nasty resonances in the mids and a 10db hole from 700hz to 2000hz.

phreaps the driver was broken? is the 108ez really that bad? if the dip is really that big, it can't be good at all.

where can i find measurements of the 108ez. i could not find that much with google.de. is someone here who has the driver and can measure the frequency response?

looking at mr. pass measurement (you can find the articel at sixmoons.com, it's called "firstwatt, an introduction to the concept") the frequency response looks fine.

:help:
lilmik
  Reply With Quote
Old 26th January 2006, 09:45 PM   #2
diyAudio Member
 
Join Date: Jan 2005
Location: Austin
I expect that klang & ton is given to hyperbole. My measurements of the FE-166 correspond VERY nicely both to Mr. Pass's and to Fostex's own measurements.

I don't see why the FE108 would be any different. Pass does show a 5db dip from 800-1500.

Note that Stereophile also tested a 108 equipped speaker. so you can find some measurements there

Sean
  Reply With Quote
Old 27th January 2006, 08:37 AM   #3
diyAudio Member
 
Scottmoose's Avatar
 
Join Date: Mar 2005
Location: UK
No, the Fostex FE108ESigma is not that bad. Actually, it's got one of the best mid-ranges you're ever likely to come across. Klang & Ton don't know what they are talking about if that's how they classify it. They've also come up with some complete nonsense about quarter-wave loading recently from what I hear, so I reckon the best policy would be to ignore everything they say.

This isn't just subjective opinion by the way, though plenty of people will give you their evaluation that it's one of the best drivers they've ever heard (within its limitations: let's be honest, a 4" driver is never going to be a bass-monster). As you cite yourself, Nelson Pass has measured them, likes them, and his measurements agree very well with the Fostex published data. I've heard them in a few guises, and they always sound very good, and measure well (providing they are in a properly designed enclosure). Have a look here at just one commercial example: Terry Cain's IM BEN double-horns. All $4,500 of them. Terry is not known for poor-sounding designs -I don't think he'd be using it for no good reason! http://www.cain-cain.com/IM-BEN/index.html By the way, if you haven't run across Terry before, he's a big supporter of the Fostex recommended enclosure designs they provide free on their site. Comforting to know, coming as it does from someone who produces horns like those in the above link!

Best
Scott
__________________
Community site www.frugal-horn.com Commercial site www.wodendesign.com
  Reply With Quote
Old 27th January 2006, 06:29 PM   #4
LilMik is offline LilMik  Germany
diyAudio Member
 
Join Date: Jun 2004
Location: germany
hello again,

sorry, i made a mistake . it was not the magazin "klang & ton", it was the german magazin "hobby hifi". they said the 108ez is unusable.

searching this fourm up and down, i found a nearfield measurement of a 108ez in an 2 liter sealed box. look at the picture. scary . on the other hand, look at the frequency response from 7000hz and upwards. i really don't think the 108ez has a frequenzy response like this.

josephjcole made the nearfield measurement. here is the thread, it is post number 6 --> FE 108e Sigmas cheap

how does fostex smooth there measurements. if you use 1 octave or 1/2 octave, a small but sharp dip may disappear or look hamrless, if you smooth over 1/16 octave, it can look very bad.

greetings from germany
lilmik
Attached Images
File Type: jpg ugly_108ez.jpg (34.7 KB, 1341 views)
  Reply With Quote
Old 27th January 2006, 06:57 PM   #5
Dumbass is offline Dumbass  British Antarctic Territory
diyAudio Member
 
Join Date: Mar 2003
Location: British Antarctic Territory
I have to distrust that measurement.

I mean, AFAIK Joe likes those drivers! (He has them in really cool potter enclosures.)
  Reply With Quote
Old 27th January 2006, 07:05 PM   #6
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
I haven't measured the 108EZ, but there's no way
that it has that dip. It's an enclosure or measurement
artifact.
  Reply With Quote
Old 27th January 2006, 09:00 PM   #7
diyAudio Member
 
Join Date: Jan 2005
Location: Austin
Quote:
Originally posted by LilMik

how does fostex smooth there measurements. if you use 1 octave or 1/2 octave, a small but sharp dip may disappear or look hamrless, if you smooth over 1/16 octave, it can look very bad.
That is an issue

UNsmoothed responcse of my kestrel hotrods look better than my FE166 horns. smooth them a little and they look comparable from 70hz up.

NO one that has listened thinks the kestrels sound better from 70hz up. Thats why they are in the hobby room and the fostexes in the main room.

Sean
  Reply With Quote
Old 27th January 2006, 09:42 PM   #8
diyAudio Member
 
Scottmoose's Avatar
 
Join Date: Mar 2005
Location: UK
Sorry, I don't buy that graph at all. Could be anything, but I've never seen or heard a 108 with a giganitic hole like that.

So it wasn't K&T, but Hobby Hifi? Yet another nail in the coffin of German hifi magazines then. They'll be getting as bad as the UK mags next.

Scott
__________________
Community site www.frugal-horn.com Commercial site www.wodendesign.com
  Reply With Quote
Old 28th January 2006, 05:09 AM   #9
navin is offline navin  India
diyAudio Member
 
navin's Avatar
 
Join Date: Jan 2002
Location: Mumbai (Bombay), India
Send a message via MSN to navin Send a message via Yahoo to navin
how does one compare the 108 vs other 4" fullrange drivers like the JX92 or the one from TB.
__________________
...still looking for the holy grail.
  Reply With Quote
Old 28th January 2006, 09:20 AM   #10
diyAudio Member
 
Scottmoose's Avatar
 
Join Date: Mar 2005
Location: UK
JX92S is the only driver I know of the size that's comprehensively better. But then, it should be: a) Ted Jordan designed it, and B) it's about 3 times the price. The Tang Bands? The problem with Tang Band is that they are very inconsistant. Their current 4" bamboo cone job (the higher priced one) is supposed to be excellent, probably the equal of the Fostex in some ways, and beats it in the bass (looks good too), but they keep chopping and changing about, and not all of their drivers are of the same quality. Anyone want to take a bet that it's replacement will be inferior to the current version? Damning with faint praise: I love the magnet on those things and have a pair on order for some TQWTs I'm planning.

Best
Scott
__________________
Community site www.frugal-horn.com Commercial site www.wodendesign.com
  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
Fostex FE 108EZ pair for sale bigaudioscotto Swap Meet 2 8th August 2009 04:43 PM
FS: Silver Iris Coaxial 15" driver pair (sans XO and compression driver) theAnonymous1 Swap Meet 0 24th April 2007 12:09 AM
looking for opinions on frugal horns with the veravox5s vs. fostex fe126/108ez mp9 Full Range 1 28th October 2006 07:47 AM
My Fostex FE 108EZ project, Part 2 Taperwood Full Range 21 13th April 2006 02:48 AM
mtm versus tm driver recommendations on project with $500 driver and xo part limit gsattler Multi-Way 4 20th May 2002 05:54 PM


New To Site? Need Help?

All times are GMT. The time now is 12:20 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