The Classic Audio Loudspeakers model T-1 falls into this category. Its easy to drive (98dB and 16 ohms) is very fast, smooth and detailed; owing a lot to its field-coil powered midrange driver, which is a beryllium diaphragm with a Kapton surround, which has its first breakup at 35KHz. But the woofers are field coil powered too- a forward firing 15" and a downfiring 18", crossed over at about 250Hz.
People often comment on its ESL-style speed, but of course this is why you go field coil, as the magnetic field in the voice coil gap does not sag when current is applied to the voice coil; its the only way to get that sort of speed without going ESL and for the same reason that ESLs are so fast- there's a power supply that powers the motor. The nice thing about the efficiency of course is that with many manufacturers, their smaller amps sound better and you get less thermal compression.
A second great speaker in this category is the Majestic from Sound Lab. This is the state of the art in full range ESLs bar none.
People often comment on its ESL-style speed, but of course this is why you go field coil, as the magnetic field in the voice coil gap does not sag when current is applied to the voice coil; its the only way to get that sort of speed without going ESL and for the same reason that ESLs are so fast- there's a power supply that powers the motor. The nice thing about the efficiency of course is that with many manufacturers, their smaller amps sound better and you get less thermal compression.
A second great speaker in this category is the Majestic from Sound Lab. This is the state of the art in full range ESLs bar none.