Finished this fe166e project recently, and have been going through the music collection to test 'em and break 'em in.
Length is 3.75m (just under half resonant wavelength of fe166e), throat size is 0.0086 sq.m (13.3sq.in) or 0.65*Sd. Mouth is 0.14sq.m (231sq.in)
Expansion is something like half way between conical and exponential.
On first listening, I thought the cymbals sounded really horrible like dolby C, totally compressed and mechanical sounding, but with a few hours they've really smoothed out. I guess this is the coupling between the main cone and voice coil/whizzer loosening up? I see why these drivers require a long break in. The bass response seems to have improved too, not so much the extension, they've more like 'mellowed', for lack of a better description.
I can't see why you would need a T90A tweeter with these as the treble seems balanced to me, but I suppose I wouldn't miss them until I tried them!
Overall, I'm really happy with the result. The bass extension is great, and the Fostex drivers sound dynamic and very open right accross the frequency range.
There's a picture attatched for anyone interested. I priced Jarrah veneer, but thought better of spending more on the finish than the drivers, so my lass painted them in 'suede' effect textured paint and I really like the finish. I think timber veneer might have made them look a bit overpowering.

Length is 3.75m (just under half resonant wavelength of fe166e), throat size is 0.0086 sq.m (13.3sq.in) or 0.65*Sd. Mouth is 0.14sq.m (231sq.in)
Expansion is something like half way between conical and exponential.
On first listening, I thought the cymbals sounded really horrible like dolby C, totally compressed and mechanical sounding, but with a few hours they've really smoothed out. I guess this is the coupling between the main cone and voice coil/whizzer loosening up? I see why these drivers require a long break in. The bass response seems to have improved too, not so much the extension, they've more like 'mellowed', for lack of a better description.
I can't see why you would need a T90A tweeter with these as the treble seems balanced to me, but I suppose I wouldn't miss them until I tried them!
Overall, I'm really happy with the result. The bass extension is great, and the Fostex drivers sound dynamic and very open right accross the frequency range.
There's a picture attatched for anyone interested. I priced Jarrah veneer, but thought better of spending more on the finish than the drivers, so my lass painted them in 'suede' effect textured paint and I really like the finish. I think timber veneer might have made them look a bit overpowering.
