Originally Posted by coctostan
There are many woofers that work well in that range. Because you only need it to play up to 450hz it won't play as vital of a role as in speakers where the woofer needs to cover above 1khz.
1. Do you want deeper extension or higher sensitivity?
2. Where are you located? If you are in Belgium you might have different availability than us in US. It can also affect prices.
Since it is music that's my focus (from stereo 16/44 to 24/192 up to music in movies), I'd say lower extension is more important than ultra-high sensitivity. There are however two large subs already made. These are tuned to 13 Hz and will be positioned in between the LCR. Maybe I am wrong about it, but my gut feeling says to try the x-over @ 45 Hz, the threshold for directivity.
Yes, I am in Belgium, this is why I prefer B&C (made in Italy) or BMS (Germany) or perhaps Beyma (Spain). AE seems to be direct import only, which means costly shipping plus 30% for duties & VAT.
I also want to consider 18" but maybe that's not as cost effective. 200 liters net internal volume is no problem, but 300 liters would be impossible. Hence the 18" would need to be in a sealed cabinet.