I just bought two 10" ALpine type-r subwoofers. I looked up the enclosure guide from Alpine and for a sealed enclosure it says the box should be 18L for each sub. Isn't that way too small?? It says the resonate frequency will be 49Hz. Does that man the lowest sound the sub will make is 49 Hz???



Any help will be appreciated.

Try downloading a programe called winISD. Type your sub specs into that and it whould help you make a nice box. Also the type r's go well in ported enclosures as well

I tried that and it told me 113 L. I dunno if thats right. Anyone got any other ideas??

ummmm winISD......

Post up the specs and ill have a look.

Power Handling (Peak): 1500W
Power Handling (RMS): 500W
Frequency Response: 28Hz - 500Hz
Nominal Impedance: 4Ohm+4Ohm
Sensitivity (SPL@1W/1m): 83dB
Installation Diameter: 231mm
Depth: 172mm

ok, now the T/S specs.

things like Fs, Qts Vas etc etc

Qms/Qes/Qts: 8.76/0.43/0.41
Vas: 29L
Fs: 30Hz
Inductance (Le) 1kHz/20kHz: 3.92/1.39
Sensitivity: 85dB
DC Coil Resis. (Re): 3.6 + 3.6

Do you need anyhting else??
Sorry I dunno jack bout this technical stuff.

30L tuned to 33Hz looks good.

thanks.

from modelling the specs as well, 18L for a sealed enclosure per sub looks fine. not too small.



these subs suit sealed or ported. depends what you're after:



*sealed: easier to build, smaller and lighter box; more accurate sound (less lagginess), won't play as low or loud

*ported: more complex design, bigger and heavier box; more group delay (lag), much louder and lower