Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks? - Page 113

dmason · 13th August 2006, 11:34 PM

I know. This is the why, the how, and the holy ghost. 91db @ 30Hz. Jim, they must sound amazing. Do the plugs next.

Imagine what full-on orchestral dynamics sound like, with these and a fast amp playing something like Bernstein conducting, "Rodeo" ...but in your living room.

Andrewbee · 20th August 2006, 05:46 PM

hi all,

has anyone built the bib for the Fostex fe-166es-r yet?

Using GM's excel spreadsheet calculator I get this but am concerned about the biga$$ magnet that it has and if it will actually fit. I know I can juggle the figures but if someone has already done it I see no need for me to reinvent the wheel.

Thanks

zobsky · 20th August 2006, 05:57 PM

Quote:

Originally posted by Andrewbee
hi all,

has anyone built the bib for the Fostex fe-166es-r yet?

Using GM's excel spreadsheet calculator I get this but am concerned about the biga$$ magnet that it has and if it will actually fit. I know I can juggle the figures but if someone has already done it I see no need for me to reinvent the wheel.

Thanks

in case it doesn't fit, you could always build a spacer baffle to increase the distance between the back wall and the magnet

Andrewbee · 20th August 2006, 06:26 PM

Zobsky and all,

I just whipped out the graph paper and did a quick scale drawing. It will NOT fit so the
extra baffle will be needed. I was planning on putting on some wings anyway so will incorporate them into the extra spacer baffle.

Thanks

Scottmoose · 20th August 2006, 06:41 PM

That's the only problem with sticking to the ~ideal conical expansion rate -you'll usually need an additional baffle to get sufficient clearence. You can shift to a different rate -TC's original used a WxD ratio if 1:2.1 for example. How audible the differences between different expansions are is an interesting question. I suspect minor differences won't be that audible, though using Greg's spreadsheet should give the theoretically optimal results.

There has been a 166ES-R BIB (Clarke -you out there?) with considerable success I gather.

Tachyon · 20th August 2006, 08:11 PM

I'll get the measurements on my BIB's with 166 ES-R tomorrow, the magnet is free by one cm.

For those who remember my missunderstanding on the clearance of the internal baffle at the bottom, I decided to take the bottom out and grind away that extra cm at the end.

I'm now in the process of oiling them with chinese wood oil and some pigment. I have ordered two black stone slabs to use as a plint for them to stand on.

Tachyon · 20th August 2006, 08:14 PM

Old bottom out..

Tachyon · 20th August 2006, 08:16 PM

New bottom fits like a glove..

Tachyon · 20th August 2006, 08:25 PM

Clearance around driver

Scottmoose · 20th August 2006, 08:27 PM

Oh yes indeed. Very nice. Scott likes.

13th August 2006, 11:34 PM	#1121
dmason diyAudio Member Join Date: May 2004 Location: Republik of Kalifonia	I know. This is the why, the how, and the holy ghost. 91db @ 30Hz. Jim, they must sound amazing. Do the plugs next. Imagine what full-on orchestral dynamics sound like, with these and a fast amp playing something like Bernstein conducting, "Rodeo" ...but in your living room. __________________ "Pilau Buggah, Big Islan Mo Betta!!"

20th August 2006, 06:26 PM	#1124
Andrewbee diyAudio Member Join Date: Apr 2002 Location: Cayman Islands	Zobsky and all, I just whipped out the graph paper and did a quick scale drawing. It will NOT fit so the extra baffle will be needed. I was planning on putting on some wings anyway so will incorporate them into the extra spacer baffle. Thanks __________________ None of us are leaving this world alive. Enjoy it responsibly as you may.

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20th August 2006, 06:41 PM	#1125
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	That's the only problem with sticking to the ~ideal conical expansion rate -you'll usually need an additional baffle to get sufficient clearence. You can shift to a different rate -TC's original used a WxD ratio if 1:2.1 for example. How audible the differences between different expansions are is an interesting question. I suspect minor differences won't be that audible, though using Greg's spreadsheet should give the theoretically optimal results. There has been a 166ES-R BIB (Clarke -you out there?) with considerable success I gather.

20th August 2006, 08:11 PM	#1126
Tachyon diyAudio Member Join Date: Feb 2005 Location: Sweden	I'll get the measurements on my BIB's with 166 ES-R tomorrow, the magnet is free by one cm. For those who remember my missunderstanding on the clearance of the internal baffle at the bottom, I decided to take the bottom out and grind away that extra cm at the end. I'm now in the process of oiling them with chinese wood oil and some pigment. I have ordered two black stone slabs to use as a plint for them to stand on.

20th August 2006, 08:14 PM	#1127
Tachyon diyAudio Member Join Date: Feb 2005 Location: Sweden	Old bottom out..

20th August 2006, 08:16 PM	#1128
Tachyon diyAudio Member Join Date: Feb 2005 Location: Sweden	New bottom fits like a glove..

20th August 2006, 08:25 PM	#1129
Tachyon diyAudio Member Join Date: Feb 2005 Location: Sweden	Clearance around driver

20th August 2006, 08:27 PM	#1130
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	Oh yes indeed. Very nice. Scott likes.