subwoofer in a cupboard?

ok ive got a yamaha sw305 sub which is quite big and the girlfriend keeps moaning about it being an eye sore wherever i put it in the lounge

i am just wondering about putting my sub in a wall length cupboard that runs for 13ft at one end of my lounge which is 16*13 with the tv sat on top of this in the middle. the cupboard is about 60cm high and spilt into three sections with double doors on each part. the sub would have to go on its side and fits just about with the doors closed touching thr front of the sub. ive tryed a few films with a fair bit of base and can;t tell much difference with the doors open or closed.

the yamaha sub has two 8" drivers with the port in between, all facing forwards. am i right in thinking that the base will be unaffected by being enclosed in there as low freq will just go dtraight thru?

this would be ideal as it would be complely out of site.

 

Another option is the one presented here: (dutch site)

http://www.htforum.nl/yabbse/index.php?topic=14380 (reply 4, it's Ikea stuff)

B.t.w.: I have my own Yamaha yst-sw800 (cherry) disguised as a small side tabel to my workdesk.