Gchang (straight chang) with FE206E questions - 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 13th November 2009, 12:58 PM   #1
diyAudio Member
 
Join Date: Jun 2007
Location: Mumbai/Delhi - India
Default Gchang (straight chang) with FE206E questions

Hi all,

I have been sitting on a pair of FE206E's for a couple of months now, and have finally decided to build them a home. Have decided on the Gchang because it is within my skill level to build, and most people who have built one have been happy with it. i was a bit concerned because i have the FE206E and not the FE207E that it was designed for but have decided to take the plunge. I will add the recommended 4 ohms series resistance and hope for the best.

This brings me to my first question: what power rating should this series resistor be? is 10W enough?. Also is it better to use a non-inductive part here?

My second question is regarding the 'holey brace' that is the recommended form of brace. i don't have a router so cutting circles for me is not easy at all. what brace can i use without having to cut circles?. would two vertical strips of wood (say 1" x 1") crossed by two horizontal strips work? something like a tic-tac-toe grid.

This is only my second build, in my first i just soldered the internal wiring to the speaker lugs, i have read in some build threads that this is not advisable since it can melt the voice coil, and also because it makes the speaker tougher to remove (to adjust stuffing etc). what method of connection do the gurus prefer?

Quite excited about the build, have been meaning to try out a full range build for a long time now...will post build photos as they come...

Thanks in advance for any help...

cheers,
mymindinside
  Reply With Quote
Old 13th November 2009, 01:21 PM   #2
diyAudio Member
 
Join Date: Jan 2007
Howdy mymindinside,

How come G-change and not Sachiko? Just curious! FE206E and FE207E really have absolutely nothing in common except the physical size, in my mind.
  Reply With Quote
Old 13th November 2009, 01:28 PM   #3
diyAudio Member
 
Join Date: Jun 2007
Location: Mumbai/Delhi - India
I was quite keen on the sachiko,.. from what i have read it is a very good design. what went against it was that in one thread scottmoose (i think) said that they needed a fairly large room to work their best, and did not sound great when placed close to rear and side walls. unfortunately in my room i will have to place them about a foot and a half (max) away from the side and rear walls...
also they are a fair bit bigger than the Gchangs.

I was quite concerned about using the FE206E in this cabinet but then i read Bobtrancho's half chang thread and he seems to be quite happy with this driver.

what do you guys think

mymindinside
  Reply With Quote
Old 13th November 2009, 02:00 PM   #4
diyAudio Member
 
Jim Shearer's Avatar
 
Join Date: Jun 2007
I built a pair of HC's like Bob T using the FE206e driver. Very pleased w/ the results. You can try the resistor alone, but I used a BSC with a 5.5 ohm R and 1 mH air core inductor. I use Mills non-inductive resistors:

Parts Express: Featured Categories

The holey brace can have holes of any shape, just so long as they make up about 40% of the area. You can cut them with a jig saw or whatever.

Cheers, Jim
__________________
A day without music is like a day without food.
  Reply With Quote
Old 13th November 2009, 02:26 PM   #5
diyAudio Member
 
Join Date: Jun 2007
Location: Mumbai/Delhi - India
Hi Jim,

Glad to hear that the cabinet - driver combo worked out well for you.
I take it you used 12W resistors.. That is what i thought the rating ought to be, just wanted to make sure. good to hear about the brace as well. will have some kind of rectangular holes in the brace.... thanks for the help

right now the only amp i have is a lm3886 gainclone. i am thinking of building a F2 (current source design from Nelson Pass)...has anyone tried either of these with the FE206e in the changs?
  Reply With Quote
Old 13th November 2009, 02:32 PM   #6
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
G Chang & Curvy Chang have about the same room requirements as Sachiko... Using them with FE206 will alow placement closer to the wall. For a smallish room where you can't get far enuff away from the box for the 2 mouths to integrate, you might be better with Half Chang.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 13th November 2009, 02:40 PM   #7
diyAudio Member
 
Join Date: Jun 2007
Location: Mumbai/Delhi - India
Hi Dave,

its an honor...

My listening distance will be about ten feet from the speakers and they will be roughly the same distance apart.

I was just worried that being too far back into the corner (one and a half feet from rear and side walls) would make the Sachiko's bass a bit boomy and overwhelming. from what i understand of your post, the same 'corner problems' will affect the Changs as well. in that case i might go ahead and build the Sachiko.

my interest in these designs has been to experiment with a sound which has the least correction circuitry (EQ, BSC) in the signal path. As i understand, the Sachiko does not need a BSC because the cabinet is 'self correcting'.

Cheers,
mymindinside

p.s. Dave, i cant access the frugal-horn website today, is it a problem on my end or is the site down?

Last edited by mymindinside; 13th November 2009 at 02:42 PM.
  Reply With Quote
Old 13th November 2009, 03:05 PM   #8
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Quote:
Originally Posted by mymindinside View Post
My listening distance will be about ten feet from the speakers and they will be roughly the same distance apart.
That is sufficient.

Quote:
I was just worried that being too far back into the corner (one and a half feet from rear and side walls) would make the Sachiko's bass a bit boomy and overwhelming. from what i understand of your post, the same 'corner problems' will affect the Changs as well. in that case i might go ahead and build the Sachiko.
It is a better fit to the driver... if needed you can always make an "anti-BSC" filter to reduce bass.

dave

Quote:
p.s. Dave, i cant access the frugal-horn website today, is it a problem on my end or is the site down?
It is a problem at my end. An ID 10 T Error which i am headed into to town to fix right now.
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 13th November 2009, 03:55 PM   #9
diyAudio Member
 
Join Date: Jun 2007
Location: Mumbai/Delhi - India
Well,
the man has spoken
Sachiko it is.
Big thanks to everyone for the help

already bought the plywood though, it is 18mm and not 19mm
will just correct it while glueing up i suppose

cheers,
mymindinside
  Reply With Quote
Old 13th November 2009, 04:05 PM   #10
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
We only get 18mm here too, so at some point i need to draw an 18 mm one. You can either just use the mid-line or if you want to get anal, redraw to keep the passages the same size.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  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
G Chang Questions leeoh Full Range 16 1st January 2009 07:07 AM
Half Chang or Suzy Chang with Subwoofer? tripathdude Full Range 2 15th December 2008 04:47 PM
OK straight AC bad how about this? 8000kva ben62670 Power Supplies 12 6th February 2008 11:02 PM
Newbe questions TQWT using fostex FE206E LazyJones Full Range 8 30th October 2007 03:27 PM
MLTL Design with Fostex FE206E Questions JeffG Multi-Way 3 12th July 2004 06:06 PM


New To Site? Need Help?

All times are GMT. The time now is 09:32 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