full range without whizzer cone

[NED 209]

i got a set of the bogens! a friend of mine in the states is helping me out. should have them in a few weeks. i had to trade him the original woofers from the radio though, kinda hard to replace, so im apprehensive, but hell its a catalyst at any rate

 

[régine's]

Got a phone call
somebodies wife will give me a pair Fostex F200A
for free as LOL she got divorced and does not know
what do do with them.

Me either
a nice driver but ....can be used for what kind of speaker ???

 

[Scottmoose]

Send them to me for proper disposal?

The world, my friend, is your oyster. The mighty F200a is one of the finest FR / WR drivers available and there are lots of things you could do with them. How big do you want to go with the cabinet? If you want modestly big, this should do the trick nicely (especially the curved-front version): http://homepage.mac.com/tlinespeakers/FH/download/Chang-NBVR-map-140807.pdf

 

[régine's]

seems not too big at all 1.30 m i do guess and curved front looks nice
Thanks

 

[régine's]

Hm as they are not mentioned there do they fit anything changing ?????
Sounds too good to be true to me...

 

[régine's]

well if it fits without anything changing, maybe my speaker as the woodwork does not look horrible complicated, is rather small and narrow, simple and a smalish FET amp could do the job.

 

[régine's]

can anybody of the frugal group give me please a hint about the back triangle ?

 

[Scottmoose]

The F200a requires the same volume as the 207 I designed it for, so it's a straight swap. Flat to 40Hz. Good enough?

The rear triangle deflector size is up to the builder. So long as it's long enough to prevent cross-talk between the upper & lower throats, that's fine. 1.5in should do. An internal brace (not pictured) would be useful as well.

 

[régine's]

Fine but sorry
there is no void free birch plywood her
have to drive 200 miles in one direction,
rent a pickup as they don't cut Russian marine plywood
horrible expensive online price about 1300 Euros
Went to, yes they are open two big DIY markets,
all plywood not birch and scrap, merde.

 

[Scottmoose]

I know that feeling.

You can resort to a mixture of MDF & chipboard. Not as good as BB ply, but it's a whole lot better than nothing.

Laminate 1/2in MDF to 3/4in MDF & you'll push panel resonance below the passband of the cabinet. Use that for the sides, the top & bottom, & 3/4in chipboard for the other panels. Should do a decent job.

 

[régine's]

Will try this or starting for hunting bb bord exist only in 15 mm

 

[régine's]

1/2 inch MDF would be 12.7 mm 12 does exist
3/4 inch MDF would be 19mm but only 18 mm exist

would give 30mm MDF for the sides
and 12 for the rest maybe 14 exist

could this be ?