Best woofer for 6 litre cab?

[jaste]

Hi! I´m running a tangband w4-657sh in a 6 litre ported cabinet togheter with a tangband tweeter. It sounds good enough for me and I almost got the bass I need. Now I´m just wondering if anyone can point out another fine woofer which probably will deliver deeper bass?

I´ve been drueling over this one but it seemes hard to get...
http://www.tb-speaker.com/detail/1230_04/w5-1140sd.htm

[tinitus]

This German made driver should be very well behaved, and seems to work in 6liter, 5mm Xmax p-p

http://www.bmm-electronics.com/Produ...roduct_ID=5540

And theres the new SB Acoustic, but it need a little bit bigger box, nice Xmax of 10mm p-p

http://www.sbacoustics.com/specprodu...20SB15NRXC30-8

But maybe you should use your money on a little bandpass sub