Regarding efficiency and amp driveability. I spoke to the 9H designer (Oleg B.) and he assured me that the speaker-level crossover tap to the DSP/woofer amps is of very high impedance and negligible back EMF.
So any amp driving the 9H just sees the tweeter and mid ...hence it effortlessly delivers it’s best performance ...the woofers are invisible. The 9H is 96dB at 8ohms so my ~35watt ZOTL40 was barely at 20% volume to fill the room yet each song I played was the best I’d ever heard it.
So any amp driving the 9H just sees the tweeter and mid ...hence it effortlessly delivers it’s best performance ...the woofers are invisible. The 9H is 96dB at 8ohms so my ~35watt ZOTL40 was barely at 20% volume to fill the room yet each song I played was the best I’d ever heard it.