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Found the answer but thanks

The 7B and up are stable for low impedance and according to their chief designer:

"I would not recommend the 4B into 2 ohm REACTIVE loads for sustained periods - thats what the 7B and 28B's are for .../...

Reactive loads are loads that tend to store energy. Typical example of this kind of load are Electrostatics which act like a big capacitor and push back.

Most dynamic speakers are easier to drive and are more resistive so the amplifier has an easier time of it. So a 2 ohm load on a normal dynamic or resistive load speaker would not cause a 4B much trouble."


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