Subwoofers

 I'd like to augment my current stereo speakers, which go down to about 40 Hz, with a subwoofer.  In the future, I'd like to add center & rear channel speakers for a full "home theater" rig.  To the best of my knowledge, the subwoofer will need to meet the following requirements:
 
1.  Flat, smooth, frequency response to well below 20 Hz.   (I listen to both classical organ & D.J. Magic Mike)
2.  Flat, smooth frequency response up to 150 Hz  (I plan to add those meager rear surrounds)

I have a Harman Kardon avr 3550 and a yahama subwoofer yst -fsw050. Its a 7.1 system. Just curious what the best setting would be in general. I have turned on the LFE on my sub setting. and adjusted the db to 8 db. and also turned the bass management up to 7 . Is this too high? I would like some cinematic background thud while watching tv or blue ray movies, i jsut dont want to blow anything out.  Anybody have any ideas?
Thanks!

I have a studio/theater room roughly 20' x 30'. I have a pair of Klipschorns up front, a pair of Corwall/LaScala's as a center channel (a Crites combo) and a pair of Cornwalls as the rear surrounds, small surrounds with 7" woofers don't count. (Yes I'm almost as old as most of the dudes at TAS, reliving my dreams from 35 years ago, finally)
Knowing the Klipsch's all stop near 30 or 35 HZ, but have a total of 6 each 15" drivers in this live space, will I get much bottom feel from a pair of subs?

Hey guys, as the subject says, this may be a bit odd.  My friend runs a Haunted House, and he asked me how to get a really deep sound projected into a room (about 10 foot square).  He said he wanted the sound so low that it was more felt than heard.  My suggestion was to get some sort of sound generator to send a signal into the best subwoofer he could find, but I'm not sure if that will be enough.  Any suggestions?
Thanks.

Hi Folks

I use to run 2 REL stadium's in stereo from speaker terminals as per REL's recommendations.

Wilson speakers generally are highly regarded....typically with excellent bass response...given that how is the Watch Dog Sub...for provide well matched performance with a top performing speaker...I notice that Wilson's web site suggests that the Watch Dog will work with all their speakers...I assume equally well with music (line) input and movies (processor) input.  Has anyone experience with performing this setup...and suggestions.  Generally I am happy with the Wilson...now matched with Rockports that respond to 28Hz (in the literature)...my main goal is to have the music right

I would appreciate any recommendations for a small subwoofer under $300(or thereabouts) for use with a Yamaha YSP 3050 Digital Sound Projector.  Yamaha recommends the YST FSW050, but I don't know anything about subwoofers or what to look for when buying one.
Any help would be appreciated.
Jonathan

I enjoyed reading Alan Taffel's review in last month's The Absolute Sound. In his review of the Gotham subs he said: "I set out to achieve the best blend with my main speakers", and : The subs should not "intrude on midrange purity".

Somewhere in his description of his Wilson X-2 setup, RH mentioned that he has the JL subs behind his listening sofa. Is this for storage or is this a placement that deals with phase problems better than the typical "behind the main speakers" setup?