I am getting ready to build my next 2-way prototype, a ported 12L 2-way with a Fountek NeoCD3.0 and a 5.5-ish woofer-mid.
My "short list" of woofer-mids is:
Satori TeXtreme MW13TX-8
Purifi PTT5.2508-NFA-1
Audio Technology Flexunits 5 H 52 17 06 P (w/Sandwich Cone and LR Magnet options)
(Comments on the above welcome, of course.)
I was inspired by Troels Gravesen's "3-Way Classic" to consider mounting the woofer on a .75-inch panel epoxied to the flush-mounted front panel holding the tweeter, with the top edge of the woofer panel beveled 20 degrees.
The woofer driver would be inset or countersunk to the depth of its basket rim, meaning 6 to 7mm, which would mean a net offset of 11 to 12mm. In theory I could make the woofer sub-baffle 1.0 inches. Which would mean a net offset of 17 or 18mm.
It's not so much a matter of expense (I already have Richlite boards in both .75 in. and 1.0 in.), it's complication and weight.
Thanks in advance for your comments and advice.
john
My "short list" of woofer-mids is:
Satori TeXtreme MW13TX-8
Purifi PTT5.2508-NFA-1
Audio Technology Flexunits 5 H 52 17 06 P (w/Sandwich Cone and LR Magnet options)
(Comments on the above welcome, of course.)
I was inspired by Troels Gravesen's "3-Way Classic" to consider mounting the woofer on a .75-inch panel epoxied to the flush-mounted front panel holding the tweeter, with the top edge of the woofer panel beveled 20 degrees.
The woofer driver would be inset or countersunk to the depth of its basket rim, meaning 6 to 7mm, which would mean a net offset of 11 to 12mm. In theory I could make the woofer sub-baffle 1.0 inches. Which would mean a net offset of 17 or 18mm.
It's not so much a matter of expense (I already have Richlite boards in both .75 in. and 1.0 in.), it's complication and weight.
Thanks in advance for your comments and advice.
john
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IMHO with your choice of tweeter the best idea is a flat baffle with acoustic LR4 crossover, which can also take into account the path difference between drivers. The only pro of a stepped baffle is the possibility to use a LR2 crossover, unsuitable however with the Fountek tweeter, unless crossed very high.
The cons are complicated execution, usually non optimal distance between drivers, and diffraction. The latter alone should drive away from a stepped baffle.
One last word about your chosen mid: a 12L ported box should rule out the Purifi, based on the published specs.
Ralf
The cons are complicated execution, usually non optimal distance between drivers, and diffraction. The latter alone should drive away from a stepped baffle.
One last word about your chosen mid: a 12L ported box should rule out the Purifi, based on the published specs.
Ralf
THANKS!
My previous prototype before last was LR4/LR4, and there were plusses and minuses.
In honor of Dick Shahinian, the most recent finished prototype was LR2 woofer roll-off, Butterworth 3rd order tweeter roll-in, as Fountek recommends.
For that build, I nudged the crossover point up to 3,000Hz, to hear more of the woofer. I also ordered that crossover with replaceable tweeter level-setting resistors. Flat EQ was too dead, whereas +2dB tweeter was too much, so my plan is to move the crossover point back down to 2,500Hz, (I know that the difference is only between D# and F# in the piano's top octave), to give the tweeter more "Area Under the Curve."
And thanks re: the Purifi; it has been at least in my mind a 3rd choice.
all my best,
john