FE166e used only above 200hz.............

[norman bates]

What do you think ?


I'm thinking of crossing it at 200hz (either 12 or 24db).

I've seen a comment by lilmik
"imho opinion the 166e has a little bit better resolution and the highs are a bit better. " (in reference to comparing the 166e to the 167e)

Any audio difference between FE166 and FE167

Your opinion ?



Norman

[planet10]

http://www.bottlehead.com/loosep/S.E.Xy speakers.html

dave

[norman bates]

I'm seriously contemplating that design.
Partsexpress "Black hole" and some fill, good to go.

What components would a passive 6db of baffle step be ?

maybe I'll try the passive line level filter, but I doubt it.
Think it would work with lower z inputs like solid state amps?
http://www.bottlehead.com/loosep/S.E.Xy%20speakers.html

The driver impedance goes up a bit, so passive baffle step between amp and driver would become a smile shaped response, helpfull for our low volumes.

The f3 is a squeek under 200hz.
.25ft3 = qtc .577

To me, that design would be lacking in midbass, or even midrange and bass without any baffle step.
Then again, if you are used to the sat/sub sound, that's your perogative.

200hz crossing to 2 x 15's, that'll make you dance !!!

Norman

[planet10]

Originally posted by norman bates
The f3 is a squeek under 200hz.
.25ft3 = qtc .577

I modelled it using measured parameters and F3 came out close to perfectly on 125 Hz.

dave

[norman bates]

Here's the sealed box sizes I get for FE166e.

Qts = .21
fs = 50hz
Vas = 45.11liters = 1.59ft3

Qtc .707 sealed
Vb=.154 ft3
F3=Fsb=168 hz

Qtc .577 sealed
Vb=.243 ft3
F3=175hz
F6=131hz (estimate)
F9=87.5hz (estimate)


Here's a quick link to crunching sealed box numbers.....................
http://www.carstereo.com/help/Articles.cfm?id=26
I'll recrunch tomorrow at work, but these numbers look about right.

Norman

[Scottmoose]

I believe what Dave is refering to (he certainly doesn't need any guides to designing sealed boxes -something he's rather good at ) is that you are assuming that Fostex's published specs. for the FE166E are accurate. They aren't. I'd post some, but the drive I had them on has packed up.

[planet10]

Originally posted by norman bates
Here's the sealed box sizes I get for FE166e.

My gut feeling was that the F3 was going to be way high, but since i had just measured 2 pr of FE166, i plugged in that data instead and got 125 Hz (or real close, i'm not at that machine).

I have a 7 litre curved PE box, 2 unused plate amps, lots of spare woofers, but someone went and bought that 2nd set of FE166 putting this project on hold.

dave

PS: i am working to get a bunch more sets of measured numbers up here:
http://planet10-hifi.com/measured.html

[norman bates]

Ah !!!!!!!!!!!!!!!!!!!!!

Thanks guys !!!!!!!!!!!!!!!!!!!!!

I know it takes an act of congress to get things changed in a large company.

It's a shame that fostex doesn't grab 1 out of 100 drivers and test them to make sure specs are current........................


Seems like the 166e in that .25ft3 parts express boxes may move to the front of my projects to do................

Thanks for the footwork planet10.

Your intellectual property is valuable to many of us.

Someday I look forward to some of your phase plugs.

Norman

[planet10]

Originally posted by norman bates
Your intellectual property is valuable to many of us.

Someday I look forward to some of your phase plugs.

PP de rigor for any of the whizzer cone Fostex.

dave

[norman bates]

"PP de rigor for any of the whizzer cone fostex"

PP I assume is phase plug/

What's de rigor mean ?