Bob

What do you suggest for the FE127e problem?

I have the FE127e's in GM designed MLTL.

Right now I'm trying to find a good cabinet for a pair of FE127E's I have laying around. I've looked at all of the MLTL variants, BR's and the Fostex standard DBR. Nothing is going to go below 70 Hz and max power handling will be in the 1/2 watt range -- 85dB max undistorted. The only use I can see for a "full-range" application is computer speakers, and 24x9x9" is a bit big for my computer desk. I'm thinking that the right application for this driver is as a mid-tweeter over a 10" or 12" woofer and crossed at 300 Hz or so.

The best of the lot is indeed the Fostex DBR. However, the dip at 150Hz is just hinted at in the Fostex FR plot. Running the numbers through MJK's spreadsheet shows the dip to be a very sharp 20dB hole. AT 150 Hz, that should cause notes to drop out! Anyone build the standard DBR?

Bob

So my other question is what would be a good upgrade for the
FE127e that would be plug and play for my MLTL?

FX200 has been mentioned by GM as a drop in replacement.

Overall I'm sold on the MLTL config. The boxes have nothing
inside and I extended the port tube to 6". Original calls
for much less to attain very low frequency but the elongated
port brings the harmonics up to where all stringed instruments
like double bass and piano sound superb.

I will be interested to see what you come up with for these.

I originally got the FE127e's for computer speakers. But they
sounded better than the off brand mains I had so I started to
build with them.

The previous bookshelve speaks had junk in them near as I
can figure but the workmanship is great. I have some
blank baffles made to tinker with some other speaks for those.
Measures are very close to what Jim Griffin uses for his
Jordan BR.

I believe you meant FX120........

That said, assuming you didn't get carried away cutting out the mounting holes, the new CSS 125S is a slightly smaller, but still drop-in once you drill new mounting holes, and sims better overall in your cabs than either the Fe127E or FX120. I gather from your remarks that strong bass isn't desired, so you may have to either extend the vents to 8" or damp them to suit.

GM

Thanks for responding. And yes I must have meant what you said.

The CSS would be an interesting experiment.

And I still have (or can get more 2" pvc.

Bob's comments notwithstanding, the FE127e in the MLTL
made me a believer. This is stereophile sound on a true
budget:

Particle board shelving, pvc and a bit of glue.

I did make some grilles out of a piece of 3/8 in
particle board and some stretchy doubleknit fabric
from my old bell bottoms... (just kidding.) Grilles
look good though for being a cut and paste job.

Maybe the CSS 125's will go on deal.

One of us on here was saying they were overrated IIRC.

Over at Full Range Driver Forum there has been some
talk about a Tangband model -- 1346 (whatevs) that is showing
potential for full range builds as well.

Adire has a driver on pre-order called the Extremis 6s.
It's getting favorable recognition over the CSS released
product. Any news on that?

A fresh thread is called for... I'll go to the top and make
one.