Originally Posted by BiGBADDABOOM
Doesn't the TD12S limit the design to ~93dB?
It limits the efficiency to 93db/1w/1m. That is still pretty high. Higher than most commercial designs. It's not as good as the 4pi, but the dynamics will not be lacking. Dynamic capability is not solely a function of sensitivity.
BTW, with ~15w, the speakers will do 105db in half space...not shabby.
Originally Posted by mayhem13
In the case of the sealed variant, you'll get a much 'easier' blend setup to a subwoofer and the advantage of not having to HP the mains at all. I was surprised to see the modeled F3 of 70hz for the sealed variant which is quite a bit better that that of the Gedded B&C equipped designs.
I say go sealed and never look back or as you stated, add a port with the option to plug/unplug at will BUT don't ignore the phase issues that go along with ported designs/sub integration.
This is related to the above 93db sensitivity. The TD12S gives better bass response with its lower Fs and gives up some sensitivity. I think it is a pretty good compromise in this case. Wayne uses the TD12S for the improved bass extension instead of the TD12M which is more sensitive and has a few other advantages.
The Geddes speakers, IMO require a sub that plays better up into the 120-150hz range than what most people use. I bet Audyssey will want to set a crossover in the 50-60hz range for these TD12S's sealed mode. There will be some boundary gain which will raise the f3.