Has anyone ever used "stacked" Heresy's

I've seen a few references to people doing this, and am wondering if others have had experiences. I t looks like buying an extra pair might be a fun alternative to a sub.
While you will gain a little bottom end due to the increased surface area, these speakers still need a sub if you want deep bass. Two Heresy's with subs on each side makes for a "kick ass" rock system. Sean
I think the Heresy makes for a great rock speaker as well. It also serves the rest of the musical spectrum quite well. If you do by a second pair, and your aim is to suplement the bass, you may want to put them side by side instead of stacking them higher and keep the bass drivers both low and close to the ground. Wonderful speakers, and an outright bargain for the money you pay for them for sure. I found a big improvement in swapping out the stock internal wiring with DH Labs Silver, and replacing the back with MDF. Also, at the same time, create some better seals around the drivers and the back of the cabinet. All this should enhance your bass response to a small degree. I'd agree with Sean..if you do want to go lower a sub would be the answer. I prefer the older (original) version with the heavier cabinet, as opposed to the Heresy II model which is about 8 lbs lighter as I recall. Drivers are different, as is the crossover as well.

i tried the stacked heresys & i didnt really like it, i got much better performance placing them side by side with 1 pair on small 8" stands.

heresys are a great little speaker, i still have a new pair in the boxes stashed away in my attic for future use.

I have used the Heresies in stacked combinations with other speakers, but have always thought they would stack nicely themselves. Right now I have them tweeter side down on top my LaScalas in my rock and rip it system. The Heresies add definition even though they are not as efficient. I personally don't like sub woofer, boomy, woofy, chuffy, woozy bass, so I don't think the defined bass they provide is a bad thing. If you want bigger bass get the belles or La Scalas or fortes. But you need a good strong power amp to control those big woofers,despite the popular assumption, that the efficiency doesn't require it. Stack em D'appollito style thats what I hope to do, let me know how it turns out. Before I do it myself. If your using it as a rock loud music system a small tube amp doesn't seem to do the trick. For acoustical music a single pair should work but they may not be the best choice, It sounds like you want big sound therefore I assume you want a loud system. The power amp that is working for me at the moment is an old Audio research d100b which I occasionally swap with other vintage period pieces like Sansui which lets you roll off the top end so they aren't shrill at volume. Let me know what your power is I am looking for suggestions.
Regarding bass and the other Klipsch products Mechans mentions: I'd agree that you'd get more bass from the Belles and especially from Forte II's, but it has not been my experience that LaScala's product low bass (and I have owned two pairs). To be fair, I have not tried biamping them though as Mechans suggests. My assessment of them with various tube amps is that they begin to fall off at around 50hz and produce very little below 40hz. I've also owned two pairs of Forte II's which are less refined speakers, but excellent rockin' speakers and most definitely go lower. I've heard Belles only in a friends system and was impressed by the added bass over the LaScalas. Perhaps I oughta try biamping sometime. I imagine the issue there is keeping the spectrum in balance though.

So, it sounds like the benefit of running four instead of two, is that the bass isn't necessarily lower, its just a little louder. I actually will use the speakers for music. (I say will because I have agreed to buy a pair which I will pick up when I move, in about a month)When I auditioned them, the bass seemed just right for jazz, and a little light for rock. I think a sub might be over kill. Maybe it will be different in my room.This being said, has anyone ever heard these with a sub-sonic five. Thanks for all your help and experience.Peter
I wondered if anyone else had tried this.  I like the wall of sound it creates.  I flip the top speaker for the MTM-type effect.  Also, try Heresy's stacked on Forte's for a bigger sound.  That is my current setup and my wife is not complaining about, so I've got that going for me.

I had my Heresy on my LaScalas in the MTM configuration for a while.

One thing that isn't getting a lot coverage here is the  different and potential sound shaping, after market crossovers which you can typically find on Ebay. Some of these have gotten so successful  the makers are now building entire Klipsch like speakers (the bigger ones).  Do a search for Klipsch crossover and I bet you'll find him, and the other crossovers makers around.  

I still think you need a lot more power than it appears, because the squawker gets loud first and you think hey the volume is up, what's more power going to do.  It is loud  but the woofers just don't get going without some juice.

Finally, get your hands on an old McIntosh power amp, even the smallest old SS model MC 2505-  I think, mine is  in storage.  It has only 50 W per but each channel has a gain knob so you don't need a pre. The McIntosh house sound works great with Klipsch.  I won't say why because a lot of people get their hackles up over it (OK -I will tell you why,  they they tend to be warm imho)