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Apparently the Popori has an even tamer impedance curve

Without the big rise in the bass, which is why solid state amps struggle to make power on the Sound Labs. You need about 4x more solid state power than a tube amp on that speaker as a result (tubes don't lose as much power driving higher impedances like 30 Ohms).

The Popori is also more efficient. The speakers at AXPONA are rated 91dB; if you understand that with any planar you need to add 6dB to that number to get something more realistic (since at 1 meter a lot of the sound the planar makes isn't picked up by the microphone). So you don't need a lot of power to drive the Poporis.

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