Originally Posted by jephdood
Jon, can you share what these reasons are? And, why these issues do not come into play on any of the other top-mounted Diva designs still used today?
The top tweeter, we feel, is superior in most cases. In some cases, however, there are benefits to having the tweeter in the body of the speaker.
Swan's international model C3 is still, to my knowledge, using the top tweeter. In North America, where there is a high ratio of in-cabinet, or in-entertainment center, or under-TV installations, "enclosing" the top tweeter in that external furniture actually obstructs and reflects its superior dispersion. Obviously this isn't a problem for the great majority of main speaker setups which are set in "free air".
We also found that with the highly variable positioning of center speakers, having a little more uniform integration with the 50mm dome at the relatively high crossover frequency the C3 uses was beneficial for dispersion. We achieved this by putting the tweeter back in the enclosure and closer to the midrange. This is not an issue with the 5.1 since we know nearly exactly at what angle the listener will be from a floor-standing speaker measuring X inches from the floor to tweeter center and we can include this angle in the crossover design, which we have.
Lastly, and perhaps most importantly, saving a few inches in height means the C3 can be used in many more systems.
All in all, the acoustical differences are not great but they are worth considering, which we did. We also find that customers prefer a shorter center speaker where space is usually at a premium.