Every example limps as the saying goes. But anyway, below is Paul Miller's measurements of the Lowther Almira which uses an eight inch DX3 driver supplemented by a supertweeter. I've never hear a "full range" driver which uses a whizzer cone to extend frequency response that didn't sound ragged. A 15in driver is going to be very compromised in the midrange - more than the Lowther driver.
The best sounding efficient loudspeaker I've personally heard is the Devore Fidelity 096. Expensive, but properly engineered to perform with low powered amplifiers.
