Originally Posted by penngray
Is the only difference between the Abbey and the Nathan to low end? It looks like they have the same tweeter, same crossover, its just a different 10" driver vs the 12" driver. The 10" driver should still go fairly low and if I have a sub system no need to worry about it going that low.
Also, how does Geddes control the sensitivity mismatch between the woofers and the waveguild/tweeter design? It looks like one is 110dB and one is 92dBs.
I think that I missed this question originally - sorry.
The 12" woofer has about 3 dB more sensitivity and about 10 dB more headroom than the 10" so that makes a big difference in the systems sensitivity and headroom. Then the waveguide in the Abbey is bigger so it has better polar control. There are a lot of differences and all of them tend to make the Abbey the better speaker. But its also bigger, heavier and costs a lot more. Its up to you which suites your situation best.
The 12" woofer is about 95 dB sensitivity. The waveguide, being CD, has a falling response and is about 110 dB at the lower end, but at the upper end it is more like 98 dB. So most of the sensitivity matching is done via the frequency response tailoring required for CD. But this also yields a large limitation on the excursion requirements for the Compression Driver, meaning that almost no excursion is actually required at all. This is a major benefit.