The Motion 15s are unusually sensitive for a speaker of it's type, both in terms of measurement and in actual use. The result is a much livelier product with a very open and engaging sound, the Elacs though are less sensitive and more neutral.Al ears said:Along those lines the Elac range offer very similar qualities.davedotco said:Mentioned earlier, I can confirm that the Adam X-Art tweeter, an updated Heil Air Motion Transformer, is quite superb. Really only available as part of their active designs, I have no idea how the OP could integrate them into his system.
A more straightforward approach would be the Martin Logan Motion15, an exuberant, lively design with a ribbon tweeter, under £1000 and very enjoyable.
This gives the Motion 15 a bit of character, that might not suit everyone, they sound just a tiny bit 'american' in terms of presentation, the Elacs much more british/european. As a reference, the Rosebud hybrids sit farely neatly between the two different styles.
The folded ribbon tweeter in the Adams appears very similar to the Elac models, but in the Adam active designs it's precision line level crossovers, active drive and flexible tweeter level controls integrate the tweeter quite brilliantly.