[Me]

Hi everyone.  The 18w/8531, 18wu/8741t, 18wu/8747t (aluminum).  Between these three drivers, which one will go lower in a sealed box?  Thanks.

[Æ]

Hi everyone.  The 18w/8531, 18wu/8741t, 18wu/8747t (aluminum).  Between these three drivers, which one will go lower in a sealed box?  Thanks.

It kind of depends on the enclosure volume. Bigger box = deeper bass.
Go and take a look at the specs and recommendations over at Madisound and compare them for yourself.
I looked at them quickly, maybe the 18W/8531

http://www.madisoundspeakerstore.com/scanspeak-woofers-6-7/


Download WinISD or use ISD online and you can perform all the necessary calculations yourself.

http://www.linearteam.dk/default.aspx?pageid=winisd