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power seems lacking for something in this price class
Lacking on paper only. In reality, the QP1R model can drive even 600 ohm cans.
The QP1 can drive 600 ohm cans as well, in high gain mode.
It has a fully discrete, pure class A "Current Mode" amplifier inside. Current Mode works differently than other amplifiers. It will drive virtually any headphone on the market. You cannot tell what something sounds like by reading specs!