40Hz TH

[Dag Johansen]

Originally Posted by Brian Steele

The shape and location of the first peak suggests that (1) the horn is a bit shorter than the sim (how did you measure its length?), and (2) you might have some leakage around or near the driver.

That explains it, i just laid the horn upside down so the magnet was facing upwards, holding the speaker firmly in place.
I guess i should mount the speaker before taking more measurements.
The length was measured along the midle of the path, dividing the 90 degrees bends in four.

Dag

[epa]

Originally Posted by Dag Johansen

Thanks for all the input and sugestions! :-)
Four segment simulation with Eminence 3015LF (i know- i know, but that is the only 15 inch driver at hand now)
Made a quick impedance meassurement and its not exactly spot on...
The height of the peaks is one thing, another is the first peak which are some 6Hz higher than predicted by Hornresp.
Hm...
As of reflector plate, i will try it in the second to last bend.
But first i have to decide on which speaker i am going to use.... decisions decitions! :-)

Dag

seems the specs differ a bit for the 3015LF

[Dag Johansen]

Originally Posted by epa

seems the specs differ a bit for the 3015LF

Strange...
EKL3015LFA Eminence Kappalite 3015LF - 15" Speaker 450 W 8 Ohm

[epa]

Originally Posted by Dag Johansen

Strange...
EKL3015LFA Eminence Kappalite 3015LF - 15" Speaker 450 W 8 Ohm

These are propably the "old"specs.
There was a topic over the changed ts of the 3015lf.
And bolting it down would help

[Dag Johansen]

I have now build four of these horns and put Lab-15 in them.
Oh yes it does work!



Dag

[m R g S r]

they look great!!

[epa]

great stuff

[justint]

Wow nice .. Very professional looking

[Samuel Jayaraj]

Are these optimised for the LAB15s? I assume they are not and that they are the horns that you built for the 3015LF.

[epa]

did you use any bracings/deflectors ?
you could put casters and corner handels on the back,so one person can move them around.