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 5th September 2006, 01:11 PM   #1291
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 Scottmoose
Dave has come up with a downward-firing FE108ESigma BIB box. Picture that Dave (P10 -a different Dave! ;-) posted on the FR forum. Early Frugelhorn next to it. Look's pretty impressive. I'll have to look into upward-firing enclosures for the smaller 4 - 4 1/2in drivers again.
Dave as in Dave Dormer.... my only role was to help convince Dave that an FE108eS was not a bad move. Scott & Jeff are responsible for his choice of BIB.

His Black BIBs with his newly aquired Decware Taboo was a really synergistic match. They really rocked. They lack the finese and the ultimate extension (even thou they sim to 40 Hz) of the little horn but are still very listenable and did i say that they really rock ...

dave
Attached Images
File Type: jpg bib-108-fh.jpg (39.7 KB, 695 views)
__________________
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 5th September 2006, 01:24 PM   #1292
diyAudio Member
 
Scottmoose's Avatar
 
Join Date: Mar 2005
Location: UK
Curses. I forgot to actually attach that picture didn't I? ;-) Sorry about that!

Glad they rock out -something these boxes are rather good at for FR units. Regarding the limited extension, I don't know the exact dimensions that were used (I've PMed Dave about them, and for the measurements), but for what it's worth, going by the info Dave has posted on the FR forum, my suspicion is that the driver position too far along the line is lowering LF output by reducing gain, and that some of the terminus output is being shorted by the floor-venting. Back cutting it at an angle a la TC's could probably help out there.
__________________
Community site www.frugal-horn.com Commercial site www.wodendesign.com
  Reply With Quote
Old 5th September 2006, 01:45 PM   #1293
diyAudio Member
 
Join Date: Sep 2005
hey scott,

while you're on the topic... i have been listening to my upward firing fe108ez bibs for a few months now and while i definitely like them, there is something missing. i have never heard other full rangers so do not really know what to expect. it could be that the ceilings are too high, the room too small and i only have access to one corner but there must be a way to work with the setup i have.

i built with the dims given a while back and things improved with some stuffing in the top corner and along the bottom but is there anything i can do to further improve them? any ideas on how to alter them to downward firing or do i just add some legs? as i recall gm gave some advice on proper coupling distance but i don't think i had any idea how to figure it out.

thanks for any suggestions!
larry
  Reply With Quote
Old 5th September 2006, 02:04 PM   #1294
diyAudio Member
 
Scottmoose's Avatar
 
Join Date: Mar 2005
Location: UK
Only problem with flipping them over is that the driver will be a bit low. Check that, very low, so simply inverting them probably isn't going to work too well -you'd have to build a new box for them. Not what you want to hear I know -sorry! Is the second box hard against a wall at least? Closer the better for LF extension, which I assume is what's lacking?

OTOH, Dave's BIBs have given me a bit of a prod and I'm working on a longer BIB for the 108 and 126E at the moment (FrugelBIB anyone?). You're never going to get massive bass out of a 4in driver, but this should squeeze a little more out of them. You just need to be careful not to breech the 0.707 Fs limit Greg warned me about before -a lesson I've taken to heart, if you don't want the mid-bass to vanish on you.

What amps and wire are you running? Try shifting to a pair of 24AWG twisted conductors extracted from a run of Cat5 if your existing cable is thicker than that. 30AWG magnet wire is probably a little extreme for the 108, which has a good mid Q, and will probably need morew current than the 30AWG could provide.
__________________
Community site www.frugal-horn.com Commercial site www.wodendesign.com
  Reply With Quote
Old 5th September 2006, 03:28 PM   #1295
diyAudio Member
 
Join Date: Sep 2005
thanks scott!

i'm currently using single strands of cat5 soldered directly to the drivers, run by a charlize amp with smps from nuuk. apple lossless into airport express with a kookaburra or millett hybrid for a pre. i'm sure the dac in the airport express could use upgrading but i'm still trying to get my monica 2 dac to work with an optical input.

the main problem for me is when i turn up the volume i find the speakers very fatiguing. i had vandy 2ces a few years back and listened at much higher levels. part of the problem was remedied with stuffing but i'm not sure how much has to do with the room setup. i get much more bass when i'm near the back wall but i don't prefer the sound. actually there is a big glass door that opens to the terrace on the back wall and this may be contributing to the problem. before i write off the speakers i should probably work on treating the room a bit. guess i better head back to the search button!

just got an email from dave explaining that the dimensions he used for the inverted bib are basically the same except the front and sides are extended about 14(?) inches and attached to a base. would it be preferable to scallop the sides a la terry cain or just attach some legs leaving the bottom open? when flipped over the driver is less than 18" from the floor so they would have at least 12" long and strong enough to hold the substancial weight of the bib. i can only imagine the mdf monsters some are building.
  Reply With Quote
Old 5th September 2006, 04:05 PM   #1296
diyAudio Member
 
Scottmoose's Avatar
 
Join Date: Mar 2005
Location: UK
Yeah, got one from Dave just now. It's a good idea to get the driver nearer to ear-height. The only possible issue I can forsee with doing that is that you move the terminus away from the floor, and it might loose out on some of the room's loading. So do the upward-firing versions though.

Fatiguing? I'm begining to see the light, especially when you mention the glass doors to the rear. Sounds to me as if you're getting a bit too much midrange out through the terminus, so before experimenting with adding a stand to allow it to be flipped, try increasing the density of the stuffing on the base, which should help somewhat, and then possibly add some thick grill material over the terminus -Greg suggested this a while back. Not only will it keep the dust out, it should help attenuate the highs coming out of the horn without damaging the LF. If this doesn't help, the stand and flipping it inverted will be probably help out.

Best
Scott
__________________
Community site www.frugal-horn.com Commercial site www.wodendesign.com
  Reply With Quote
Old 6th September 2006, 01:52 AM   #1297
DaveCan is offline DaveCan  Canada
diyAudio Member
 
DaveCan's Avatar
 
Join Date: Nov 2005
Location: Moncton NB
Hello all,
Thanks for the interest in my BIB. When I first got the dims to build a BIB for the 108, I knew I wanted to change it up a little bit and have it firing downward and I wanted to have the driver higher up from the floor. Then I saw a pic of the TC design for the 108 and I thought hey I'll style them after that. I used all 1/2''baltic birch ply and it only comes in 5'x5' sheets here.
My Bib is exactly the dims that were given to m except I made the front piece 60'' and the sides 60'' and attached a 3/4'' fir base to support the cab. The round baffels are two pieces of 1/2'' baltic birch glued together and the circle diameter is 9.25''. The one thing I forgot to allow for was to increase the depth to allow for the internal divider, so whatever depth you were given for a 108 bib build just keep it the same if your using 1/2'' material and you'll be exactly how I did mine. I wired with cat5 which is just so stupid good for the price, I think I paid under $3.00 to have speaker wire for both speakers.
In my room they sound really nice, great detail and good bass, the 108 driver amazes me all the time that such a small driver can do so much, I love it.... Dave.......
  Reply With Quote
Old 6th September 2006, 04:14 AM   #1298
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 giantstairs the substancial weight of the bib
Dave's 108 BIBs are not heavy... not at all...

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 6th September 2006, 05:45 AM   #1299
diyAudio Member
 
Join Date: Apr 2004
Location: Costa Rica
Send a message via AIM to johninCR Send a message via MSN to johninCR Send a message via Yahoo to johninCR
Where do I find BIB dims for the 108ESigma ? I'll be able to have a great sound-off, since I have 5 pairs (thanks Ed). Fostex recommended vs Frugel vs BIB vs OB vs my own horn. It should be interesting and fun.
__________________
Everyone has a photographic memory. It's just that most are out of film.
  Reply With Quote
Old 6th September 2006, 08:21 AM   #1300
diyAudio Member
 
Scottmoose's Avatar
 
Join Date: Mar 2005
Location: UK
PM with 108 dimensions dispatched
__________________
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



New To Site? Need Help?

All times are GMT. The time now is 11:45 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