Quite the contrary. Their nominal impedance is 4 ohms. They are purely resistive load. This makes them an ideal amplifier load. But like most large panel speakers they require high current Moreover because they resolve best at high SPL they require high watts.
Since high wattage tube amps are expensive most people go solid state. Some examples, AR, CJ. Bryston and the aforementioned Rowland Research. Hybrids like Moscode are also a good choice.
Since high wattage tube amps are expensive most people go solid state. Some examples, AR, CJ. Bryston and the aforementioned Rowland Research. Hybrids like Moscode are also a good choice.