Is it bandpass or a horn - Gen0me 18 BPH Big smil

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   rcf  lf18x401, b&c 18sw100
Why I choose this driver?
It is cheap and branded so construction is economical. Has also branded replacements. Also cheap Around 230GBP
The box itself is also very economic. High SPL, f3 45Hz.

Parts:
http://www.filedropper.com/rcflf18x401parts

So here are the things you should know:
It is simulated in 2Pi so for indoors and for multiple boxes rear chamber could be changed.
The rear Volume could be bigger(5-10dm3) or BR longer(second resonsnce from BR is far allownig longer BR). You can make this by putting some material inside rear chamber like on this: http://www.eighteensound.com/Portals/0/EnclosuresKits/18sound_double%2018%20kit_rev060315.pdf
But also we should keep in mind hornresp oversize BR resonance.
Making bigger rear chamber or longer BR will extend speaker excursion.

I present this design as free plans, but as this is typical commercial design feel yourself to pay the designers share. I accept bitcoins - info on Facebook.

Gen0me