Magnat Xtc 300

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I am thinking about this good price sub magnat XTC 300 for a home theater use and so i run a simulation with it.The problem is tha i dont have all the T/S parameters and i would be very happy if someone knows anything about them.
The sub:
DIN Durchmesser 300
Ulower cut-off frequency 19 Hz
upper cut-off frequency 1500 Hz
Nominal Power handling 250 Watt
Max. Power handling 500 Watt
Impedance 4 Ohm
soundpressure level 92 dB
Fs 30
Vas 81
Qts 0,31
Qes 0,33
Qms 8,0
Xmax 16

Specials Solid screwed aluminium die cast basket Nickel coated terminal plug Double spider 2.5” high power capton voice coil ighly flexible rubber suspension for 14 mm linear excursion (XTC 380 - 18 mm) High power multi magnet system

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And the graph:

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Any coments about the simulation ?does it look ok? What about the sub?Has anyone used this sub for any use???

[chops]

I don't know, but being down -22dB @ 20Hz doesn't sound like a good start for a subwoofer system.

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Yes your right but i didint expect beter Considering the price from this sub.With my little expirience i think that the F3=40Hz isint so bad or is it??? I traid to for a lower F3 but i couldent do somthing beter in vented. Is it posible to do something els to improve it?

Thanks

[DcibeL]

looks like a small box and a high rolloff. What does the excursion graph look like at 250W? I would try for a larger box and lower tuning. Something like 60L and 25-30Hz?

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Originally posted by DcibeL
looks like a small box and a high rolloff. What does the excursion graph look like at 250W? I would try for a larger box and lower tuning. Something like 60L and 25-30Hz?

The excursion graph showes nothing because i dont have the Sd parameter of the sub.Is there a way to find it ???I couldent make the grap linear for a biger box and lower tunig. Maybe i am
mistaking somewhere

Thanks

[DcibeL]

You should geta good idea for the area of the cone (Sd) by measuring the diameter of the cone and using the area of a circle formula. I think it is area = pi*radius^2.

[DcibeL]

I had a look at several 12" drivers and they look to be about 500 cm^2 for Sd.

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Thanks so mutch for your interest and help but i think it's not worth of risking with this kind of sub that doesent have all the T/S parameters and i will try constructing a box with the infinity kappa 1203 se. It is about 50 euro more expencive but i think it is beter than this magnat.Is it??

Although the magnat(or a sub like magnat) doesnt have all the T/S neaded it is a real chalenge for me to make it sound good but i don't have the big expirience to do it and thats the reasone i posted this graph.