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

Scottmoose said:
I suspect you'll get deeper bass & a smoother / creamier midrange with the 165s Jeff, though never having heard the original 168s, I wouldn't like to say for certain. The 165s are lovely units though & much under-rated. Now, if only Fostex would make an FX160...


add to Dave's wish list:

FE128something or other: Sigma cone/ surround/ spider (pleated and ribbed and factory preconditioned for extra, long lasting pleasure!), wooden phase plug, die-cast frame, alnico magnet

FX120 is somewhat close to what I've got in mind, but sensitivity is a bit low for low watt SET amps.

Has anyone yet reported experience on direct comparisons of the FF( Kenaf/AL dome cap) series to similar sized units in the FE series in the same cabinets?


Don't you wish that some DIY geek at Fostex parent engineering division would read these forums?
 
chrisb said:
Don't you wish that some DIY geek at Fostex parent engineering division would read these forums?

Chris,
would be nice - but the resulting driver would cost an arm and a leg and deny us the satisfaction to tweak something affordable into a tailormade driver that can :headshot: the factory stuff.
Having said that...oh well, my pair of 206 are still on a shelf in my basement, awaiting surgery (and the day when I can afford the square mile of ply to build the Sachikos). Reason why I haven't had a go at it yet? I'm chicken...

:xeye: Pit
 
Looks like Dr Chang has become hooked on DIY speakers. Imagine my surprise...

Has anyone built BIB with FE126? I would think that might be hard to beat.

For those who cannot wait for genuine Tone Tubby hemp cones, I noticed the "Hemp Matrix" --whatever that is, are available from
www.solen.ca including a 4.5, 6.5, which looks sort of interesting, and an 8 inch coaxial, although no technical info exists on whether it even comes with a compression driver, etc., and no measurements exist for any of the drivers. The 4.5 clearly has been mounted on a cloned 4.5 Fostex flange, which makes it interesting for the smaller Fostex-based BIB's. I like that one.

For genuine HempTone cones, go to www.abrown.com click on Sales, for Tone Tubby real Hemp 8 inch wideband drivers. This run has copper shorting rings which seems to have pushed the high end UP, and I know for a fact that the cone is currently being redesigned, and improved. They are planning an Alnico version, as well as 8 inch higher Q "guitar" driver, with "insane" high frequency response, according to John Harrison. "Insane," is good, and is about as technical as these dyed-in-the-wool rockers from where else, Sonoma County, are likely to get. The point is, they get the point, and are moving fast to expand their line-up of REAL HempTone drivers.
 
The Hemp drivers do sound nice. The coax has unique prospects for a BIB. From what I hear, the VAS and Q are both much (much, much in the case of VAS) lower than the fullrange models. A much smaller enclosure would be nice, but given the extra depth of the coax, I'm not sure a regular ol' BIB could be made. They will raise the possibility of a chambered BIB. 12" and 15" coax's evidentally exist too. I doubt they'll be BIBable for most.

They have were demo'd at THE show in Vegas by a new monitor maker:

http://theshowlasvegas.com/main/exhibitors_profile.php?gbID=387

Dick Olsher has a grainy pic on "enjoy the music" too. 100% hemp cabs sure take the hemp craze to a new level.

Larkinrulez: unless spectrum has some left on the shelf, that model has been supplanted by the new ones. My guess is Spectrum will be able to get whatever exists, but everything with Hemp Acoustics requires patience.

pj
 
One more Newbie-question...wich the real big BIB (FE207E)...how much space should be between the box and the ceiling?

And...as shown at the picture, wouldn't it work at all, or just not quite as good as the original?
 

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Greets!

I've never 'done the math' to figure the exact gap required to continue an expansion into a corner, etc., but calcing the pipe's acoustic Xmax is an OK rule-of-thumb if the system is tuned low like this one is, or 8" minimum gap for ~134"^2.

Your layout is normally how I made them, then it was just a matter of tuning it via changing the gap to the wall or corner. I never perceived them as having a dipole-like presentation as some folks claim for the upward firing BIB though, so they probably sound different and should in theory measure different, but as to which may sound subjectively better is up to the individual.

GM