Horn Speakers and Sub Woofers

They key to mating a sub with Klipschorns well is to use subs that can "keep up" with the Klipschorns -- a feat most home theater subs cannot do well.  By "keeping up" this implies keeping up with the high dyamics, low distortion, and high output capacity of the Khorns.  A couple of ways to do this are noted in posts above -- use a horn sub (which will be huge) or multiple large drivers.  In my Khorn based home theater system, in order to find speakers that would keep up with the Khorns, I used JBL 4638 bass bins which are used in commercial movie theaters.  I had two set up once and they did a very fine job (four 15" woofers).  They are not true subs as they do not go as low as traditional subs, but I did not find that to be an issue.  They wen't plenty low enough for me and had no problems shaking my house.  I'm not sure I want my house shaken more than these are capable of.  The issue with these types of speakers is that they are large and heavy and will require separate amplification (probably better to have separate amps anyway).  I used the JBL bass bins only for movie/HT use and not while listening to 2-channel music.

I have two REL-328's and one REL G-2.  I am going to experiment with these subs with the KHorns in my dedicated room before moving the Horns into the living room.  

All I want is some decent low-end augmentation and LFE for Movies.  My dedicated room is where I do my serious two-channel listening (using Magnepan 20.7's in that room).   

The KHorns will probably do just fine on their own, but they don't go super low and I think I might notice that missing low-end a bit on many action movies.

To the general question (horns with subs) rather than the specific K-horn scenario, you could check out Avantgarde speakers which use that approach. I've heard them many times and have never noticed a problem with low end integration.

FWIW

There's nothing to be concerned about with HT, all you have is processed fake sound effects. 
david

["There's nothing to be concerned about with HT, all you have is processed fake sound effects.
david"]

Not to be a smart ass but they now have these things called music videos and the ones on BluRay can have rather good audio. I also enjoy the few multichannel SACDs I own on the HT.