Thanks, JGR,
I agree that suitable damping should be provided in any cab. But the driver retrofitting thing is a little different. As long as the driver works well in a given box size and tuning, then it becomes more of a subjective issue of choosing drivers for a particular set of priorities than an absolute (I know this sounds a little "well, DUH", but hear me out).
The size of box found in the TL-606-based clone boxes like Mesa's and Orange's suit a fair number of drivers past and present fairly well. Some of those drivers are questionable choices given what people pay for the cabs. Orange apparently changes it up at whim according to data I've collected here on TB, and only one of those drivers found in "stock" OBC115 is what I'd want in there. For people who want what it provides it's a great driver. Different than the BagEnd sound but great.
But the Kappalite 3015 fits that box size and tuning very nicely, and some people love it's combination of tight yet deep low end reach and provocative midrange, and it's probably 8-10 pounds lighter than the best Orange-provided choice. It's also handles a lot more power before fart-out. So retrofitting into that box is actually because it's got real choices rather than because a stock box can't cut the mustard (if you buy it when Orange is using the best of their driver choices rather than the others they have apparently used at times).
But again, there is a crapshoot element here, and damping SHOULD be provided.
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On another note, you should swing by into the current fEARful megathread and share a little about your preamp design. A lot of us are power amp users or contemplate it, and some deets, specs and impressions would set some heads a-twirl : }
