2unfit – what is a "passive x-over" ?

Hmm I don't think a passive crossover is going to work here, as you need an amplifier somewhere in the chain (the sub wants to receive a high level signal). For crossover purposes, your existing amp will do that fine already, unless we're talking about wiring the sub directly into the speaker outputs on the amp.

Well as it happened, I did the Richer Sounds run on Monday and procured myself an Eltax Rumble sub. Tried it out with Hurt Locker on BD last night. Pretty damn good, especially the gunplay. Pix of the setup to follow.

not home cinema. but sure is good for cinema. loud, crisp and clear

castle isis speakers and nad amp

Pix as promised

Gubbins in the cupboard under the stairs