BiB for Fostex FE168 Sigma: anything better?

DrewP · 9th December 2006, 11:31 PM

After trying some homebrewed backhorns which I couldn't get balanced and some open baffles that just didn't work, I'm keen to harness the full potential of my FE168 Sigmas.

The flashes of brilliance I have had from these drivers from time to time have shown me that they can be truly stunning.

The BiB looks like a relatively straightforward build and in theory, the maths has already been done so it'll be a good match.

Any of you folks reckon something else will give a better result?

I really want to get these puppies off my work in progress list and into use.

TIA,

Drew

Aengus · 10th December 2006, 01:32 AM

Hey Drew

I assume you've checked out the Frugelhorn and Spawn of Frugelhorn threads?

Can you expand on "open baffles...just didn't work". I'm kind-of (read: slowly, lazily) working on two simultaneous projects: a spawnoffrugel for my FE108s, and an open baffle for multiple drivers, and am interested in any experiences pro or con with open baffles.

Regards.

Aengus

dmason · 10th December 2006, 03:46 AM

I have had a pair of professionally built BIB cabinets for going on two years now, and mules for months before that, and can tell you that your FE168's will flat out RIP in the BIB alignment. It is a very musically honest speaker, with honest sub 30Hz response, a driver with an honest 94db SPL rating, and with some digital EQ, to shelve up the treble and flatten the notch in the midband, no tweeter is needed, and if one is, it very easy to implement.

Scottmoose · 10th December 2006, 10:07 AM

One of the best alignments I can think of, assuming you've room to experiment with room-positioning. Airy through th emidband and vocal regions, massive bass extension and a dipole feel to the LF -ever wondered what stereo bass sounds like? You'll know after hearing a pair of these things.

Are we talking about the FE168Sigma or the more recent FE168ESigma here? They're very different drivers and need slightly different treatments -I've modified some of my ideas on this since some of the ones emerged on Zillaspeak.

DrewP · 10th December 2006, 07:33 PM

No, I'm talking about the old and now discontinued 168 Sigma.

Drew

Scottmoose · 10th December 2006, 07:59 PM

Excellent. Lovely unit. Revised dimensions for the non 'E' model 168Sigma:

Line length 128in
Zdriver 27.75in
Sl=75in^2.

You should get solid performance to the low 30Hz regions. Not bad for a driver with an Fs of 60Hz.

Get a pair of Dave's phase plugs into them while you're at it, if you haven't already.

ronc · 11th December 2006, 10:59 PM

Never heard the BIB, but i designed this for the 168.

ron

http://fullrangedriver.com/gallery/a...ns-a2-pair.jpg

Godzilla · 11th December 2006, 11:03 PM

Darth Vader would probably love to own those Ron!

I would love to hear them! I'm having enough difficulty building a rectangle shaped BIB to tackle that build.

Looks stunning!

Godzilla

DrewP · 11th December 2006, 11:05 PM

Awesome, but that's the wrong 168.

Damn nice work though.

Drew

Scottmoose · 12th December 2006, 09:24 AM

Those a mod. on the Austin principle Ron? They look like the sails on an SSN to me. Shades of the Lyra (Alpha) class.

9th December 2006, 11:31 PM	#1
DrewP diyAudio Member Join Date: Jan 2002 Location: Canberra, Australia	BiB for Fostex FE168 Sigma: anything better? After trying some homebrewed backhorns which I couldn't get balanced and some open baffles that just didn't work, I'm keen to harness the full potential of my FE168 Sigmas. The flashes of brilliance I have had from these drivers from time to time have shown me that they can be truly stunning. The BiB looks like a relatively straightforward build and in theory, the maths has already been done so it'll be a good match. Any of you folks reckon something else will give a better result? I really want to get these puppies off my work in progress list and into use. TIA, Drew

10th December 2006, 03:46 AM	#3
dmason diyAudio Member Join Date: May 2004 Location: Republik of Kalifonia	I have had a pair of professionally built BIB cabinets for going on two years now, and mules for months before that, and can tell you that your FE168's will flat out RIP in the BIB alignment. It is a very musically honest speaker, with honest sub 30Hz response, a driver with an honest 94db SPL rating, and with some digital EQ, to shelve up the treble and flatten the notch in the midband, no tweeter is needed, and if one is, it very easy to implement. __________________ "Pilau Buggah, Big Islan Mo Betta!!"

11th December 2006, 11:03 PM	#8
Godzilla diyAudio Member Join Date: Nov 2005 Location: New York	Darth Vader would probably love to own those Ron! I would love to hear them! I'm having enough difficulty building a rectangle shaped BIB to tackle that build. Looks stunning! Godzilla __________________ www.zillaaudio.com/bib/bib.asp www.ZillaAudio.com

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10th December 2006, 01:32 AM	#2
Aengus diyAudio Member Join Date: Apr 2004 Location: Victoria, BC	Hey Drew I assume you've checked out the Frugelhorn and Spawn of Frugelhorn threads? Can you expand on "open baffles...just didn't work". I'm kind-of (read: slowly, lazily) working on two simultaneous projects: a spawnoffrugel for my FE108s, and an open baffle for multiple drivers, and am interested in any experiences pro or con with open baffles. Regards. Aengus

10th December 2006, 10:07 AM	#4
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	One of the best alignments I can think of, assuming you've room to experiment with room-positioning. Airy through th emidband and vocal regions, massive bass extension and a dipole feel to the LF -ever wondered what stereo bass sounds like? You'll know after hearing a pair of these things. Are we talking about the FE168Sigma or the more recent FE168ESigma here? They're very different drivers and need slightly different treatments -I've modified some of my ideas on this since some of the ones emerged on Zillaspeak.

10th December 2006, 07:33 PM	#5
DrewP diyAudio Member Join Date: Jan 2002 Location: Canberra, Australia	No, I'm talking about the old and now discontinued 168 Sigma. Drew

10th December 2006, 07:59 PM	#6
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	Excellent. Lovely unit. Revised dimensions for the non 'E' model 168Sigma: Line length 128in Zdriver 27.75in Sl=75in^2. You should get solid performance to the low 30Hz regions. Not bad for a driver with an Fs of 60Hz. Get a pair of Dave's phase plugs into them while you're at it, if you haven't already.

11th December 2006, 10:59 PM	#7
ronc diyAudio Member Join Date: Mar 2003	Never heard the BIB, but i designed this for the 168. ron http://fullrangedriver.com/gallery/a...ns-a2-pair.jpg

11th December 2006, 11:05 PM	#9
DrewP diyAudio Member Join Date: Jan 2002 Location: Canberra, Australia	Awesome, but that's the wrong 168. Damn nice work though. Drew

12th December 2006, 09:24 AM	#10
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	Those a mod. on the Austin principle Ron? They look like the sails on an SSN to me. Shades of the Lyra (Alpha) class.

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