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

[Scottmoose]

Greg's B200 ML TQWT is somewhere on this monster thread. I'll try to dig it out.

The amps look fine. The horn kit you link to is similar to a Nagaoka design I remember. Not having the dimensions, I can't pass comment, other than to note that it's unlikely to go very low. Fostex FE206E in Ron's Dallas II, FE207E in Bruce V1.1 double horn (see near the end of the Spawn of Frugelhorn thread) or the FE208ESigma in the Factory cabinet would be my choice for a regular horn. Meantime, I'll try to dig out the dims of Greg's B200 MLTQWT

[gychang]

Originally posted by mrpopgun
Lon, why not use a router with a Jasper jig (as talked about earlier in the thread)? You don't even have to buy the jig, just make one yourself - a piece of formica or thin kerf of something dimensionally stable that attaches to your router base and has holes for nails at measured distances out from the bit.

This technique does not work if the speaker opening is smallish, so I had to buy the Jasper with my 6" speaker. the Jasper works great.

gychang

[one1speed]

Originally posted by mrpopgun
Lon, why not use a router with a Jasper jig (as talked about earlier in the thread)? You don't even have to buy the jig, just make one yourself - a piece of formica or thin kerf of something dimensionally stable that attaches to your router base and has holes for nails at measured distances out from the bit. drive the nail into the center of the circle through the right spot in the jig and simply route it out with a plunge router. No wobbles.

Is it possible to do this with a non-plunge router? I have a really nice Milwaukee router, but not a plunge. I've been contemplating this, any thoughts on how it might work?

Thanks!

[Scottmoose]

Found it on page 13.

L = 113.38"
SO = 2.036"^2
SL = 265.464"^2
xO = 0.6825 (77.38")
density = 0.2 lbs/ft^3
rp = 3.25"
lp = 1.5"

Rounding these to the nearest easy values, and using Greg's nifty little Excel sheet to get a conical profile, not that it really matters much in this case as it's mass-loaded, will give you a line length of 113.5in, Zdriver of 77.5in, an internal depth of 19.5in (not including the sloping internal baffle), internal width of 13.5in, with a 3.25in diameter, 1.5in long port. I'd do this one inverted, so the driver stays at a reasonable ear height, with the port near the floor. Should be a cracking system. Big and musical.

[régine's]

Dear Scottmoose

you are great
sounds crazy and sorry maybe I'm dammed stupid, as all bl..nde
>>Greg's nifty little Excel sheet

is it anywaz on these zillion pages
or may I send him email

it's 00:39 going to bed now

Régine

a bit red wine and pizzas
so l I do gess l= Lenght

but the rest what the hell does it mean
no idea in the moment
and density oh my dear
>>
L = 113.38"
SO = 2.036"^2 ??? inches and a fraction
SL = 265.464"^2
xO = 0.6825 (77.38")
density = 0.2 lbs/ft^3
rp = 3.25"
lp = 1.5"


most books I do read are german,
have to be french and years of Speakerbuilder somerwhere
in my old flat .......no keen
do dig them out

[lousymusician]

Originally posted by maxdd_nj
Anyone here using the FR125s in a BIB?
What are your impressions? Is the bass obnoxious?

I have a pair of FR125 BIB's (now sitting idle, as I'm playing with a pair of Hemps in BR boxes). They're certainly not light on bass! My room has a pretty bad peak at 40 Hz, and the BIB's excite that peak very well. It's a kick to get a huge bass sound out of such tiny drivers, but it can get to be a bit too much. Probably more a fault of my room than of the speakers.

The Hemps can have some of the same problem, but have a little more flexibility in positioning since they don't need to right back up against the wall and that can help.

[Ray Collins]

One1Speed

Yes, it is possible....but you must be good at hovering before the plunge.

Ray

[GM]

Originally posted by Scottmoose
Found it on page 13.

.........and using Greg's nifty little Excel sheet to get a conical profile..........

Greets!

Original with notes in #240: http://www.diyaudio.com/forums/showt...709#post878709

BIB folding in #907: http://www.diyaudio.com/forums/showt...770#post945770

GM

[maxdd_nj]

lousymusician,
Thanks for the info

[loninappleton]

Originally posted by mrpopgun
Lon, why not use a router with a Jasper jig (as talked about earlier in the thread)? You don't even have to buy the jig, just make one yourself - a piece of formica or thin kerf of something dimensionally stable that attaches to your router base and has holes for nails at measured distances out from the bit. drive the nail into the center of the circle through the right spot in the jig and simply route it out with a plunge router. No wobbles.

Thanks for answering. The Hole saw has served me well
through a number of builds including a line array of 8
drivers. I have no router. But what I do have is
a roto zip device which can hold router bits. The roto
zip device also has a circle jig which I plan to use
on larger cutouts.

I'm familiar with the Jasper over the years of reading
this forum. I'd like to get a good router some day.