Beautiful work as always!
glad they've turned out so well.
glen
"Make it sound like dinosaurs eating cars"
- Nick Lowe, while producing Elvis Costello
Conratulations John,
They look gorgeous- Starts me thinking about growing it to a 2" throat for a 2440/2441. Any Thoughts guys?
Have Fun - >>> Nessun Dorma - 12 years old <<<
Best, Joe Alesi
Thanks guys--- opps , Back to school. I suppose what I should have said is grow it to a 500 Hz cut off.
Have Fun - >>> Nessun Dorma - 12 years old <<<
Best, Joe Alesi
500 Hz is a terrible crossover frequency.
Giscard...Explain (500hz)
500hz is right in the middle of the range where much vocal articulation takes place, and it's very hard to get a crossover/driver combination that will transition in that region without affecting things in an unbeneficial way, considering phase changes, dispersion differences, etc. between the drivers at crossover frequency.
John
The difference in spectral tilt could be caused by one or more of:
1) nearfield vs. farfield differences, the smith horn mouth is a diffraction slot in the vertical dimension, and you may need to make mesurments (from mouth to mic) at about 5x or 10x the largest dimension of the horn.
2) early reflections from the floor, or the speaker underneath can lead to dips in the response (mostly a sub 1khz issue)
3) the mic position in the room, and the measurment distance from the devices will vary the direct vs. reverberant (diffuse) sound ratio, and can alter the spectral tilt, depending on how live or dead your room is.
Try to make a few (3+) measurments from in and around your seating position, and visually average the various curves to get a better idea of performance. Concentrate on dips, peaks, and trends that are common among the curve families, as these will be associated with the device, rather than the room.
(nice craftsmanship, by the way)
Jack
Thanks Jack,
Nice to hear from you again. I normally do the final adjustments with the mic in the listening position, but was wondering why they changed as you got closer. I figured it was somethin like you described.
John W, maybe you can show the plans of this beauty?))
Kirill
The CAD file is http://www.audioheritage.org/vbullet...914#post232914
I have a pair I'm not using anymore if that works better for you .... Not walnut though; resin .
Good luck, Richard
The file is in a section of the forum that was dedicated to a past private project that was pay to view.
H9800_CAD.zip
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