Hi everyone,
I'm new here, but found this interesting thread and wanted to contribute. I recently picked up a pair of heresy 1's. I also did the basket and horn damping thing,only I used plummers petty. This is a very worth while tweek and clean things up a lot.
The main reason for my post is concerning the claim of great bass with the back off. I also own a pair of EV fullrange wolverine drivers in an open baffle. You need to hear open baffle bass once to appriciate this. Bass is super clean! No boxiness of any kind. The Klipsch with the back off has esentially become an open baffle. Besides having less box sound, an even bigger reason for clean bass is the radiation pattern. A normal box has an omni-directional bass pattern, with bass going in all directions equally. This excites a lot of room modes, thus causing response problems like boominess. An open backed, or dipole, speaker has a figure 8 pattern. This has energy going only to the front and back, with almost nothing going off to the sides. There are far less room modes being excited. The bass will, therefore, sound much cleaner, but won't go as deep.
Hope I've been able to help a bit with this contribution.
BTW, I love the tweeked heresy's.
Going to a music fest tomorrow and won't be back till Sunday night. Will log in again then.
Later,
Dave, hurdy_gurdyman
http://www.geocities/the_hurdy_gurdyman/