[/QUOTE]View attachment 498236
View attachment 498237 UOTE=tetrapol;4418679]TAPPED HORN AVEC LE THE BOX 12-280/8W
bad design , with the trapezoidal output does is correct a curve with a depth of nearly -6db in 60 hz .
with a more appropriate design and less liters you have an answer as well or better . For example the 18 xoc1 , danley 18 th or you want a similar design danley th412
WELL YOU VIEW ? NOTES RESPONSE HORN . THIS TEXT IS A COPY AND PASTE ON MY OPINION OF KEYSTONE PROJECT . THIS POST IS ON FDT01 12 " . IF YOU HAVE ANY TECHNICAL CONTRIBUTION BUT write it forever hold your peace .
The Thomann drivers are quite popular here in germany.
I have the 12" (the box Speaker 12-280/8-A and 10" versions.
Those are amazing for the price.
You will find lots of good diy projects in german forums.
I have only found two projects with this driver . MTH 30 and JM212 . ( bass reflex )
This driver has a FS = 37 Hz
Xmax . = 9.5 mm BL = 21 . It is suitable for tapped horn and bass reflex 40Hz .
This driver has a FS = 37 Hz
Xmax . = 9.5 mm BL = 21 . It is suitable for tapped horn and bass reflex 40Hz .
Hmm, these coil, magnet specs indicate a 2.5 mm Xmax: https://images5.static-thomann.de/pics/atg/atgdata/document/specs/283965.pdf
GM
Hmm, these coil, magnet specs indicate a 2.5 mm Xmax: https://images5.static-thomann.de/pics/atg/atgdata/document/specs/283965.pdf
GM
NOT COME XMAX SPECIFIED IN THE TECHNICAL DATA SHEET . MOVEMENT IS APPROX A 10MM.
It is all right except xmax which is 10 mm for version W , .This I tested .Hi GM,
Sd = 510cm^2
Bl = 21,88
Cms = 1,81E-04
Rms = 1,12
Mmd 90,78
Le = 2,29
Re = 6,95
Xmax = +/- 6 mm
Cheers,
Djim
Hi terapol,It is all right except xmax which is 10 mm for version W , .This I tested .
How did you test it?
Cheers,
Djim
Hi terapol,
How did you test it?
Cheers,
Djim
With a tone of 44 volts 60 hz.
Xmax = +/- 6 mm
Cheers,
Djim
Greets!
Thanks!
Where did you find it? I found several different sets of specs, all with the same '283965' document #, but only the one I listed had anything at all WRT Xmax, so a 15.1 mm VC height and 10 mm gap depth = [15.1-10]/2 = 2.55 mm and while not 100% accurate, it's a good approximation; though I've noticed in recent years that some manufacturers have been 'padding' it with various formulas, but 6 mm seems a bit of a stretch and still be at the <10% distortion the industry has historically considered acceptable.
GM
For starters you have ever seen a subwoofer with FS = 37Hz with a BL = 21 and a 2.5mm xmax ?. Does not it seem strange?A XMAX OF 2.5 MM is characteristic of a CONE FREQUENCY DRIVERS FROM 100HZPlease fully explain.
GM
TO APPLY a tone generator 60Hz signal amplified 40 VOLT IN A BOX tuned to -
40HZ . CONE 10MM MOVES UP IF WE INVEST POLARITY CONE 10MM MOVES DOWN.
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