Mi-Horn VHT Measurements and Analysis
The impedance profile is a bit erratic but doesn't dip below 4 ohms within its usable bandwidth. Given its high efficiency, and benign electrical phase, I don't see being a problem for any moderately price receiver to drive without incident. The systems low end response appears to be tuned at around 65Hz.
On Axis Nearfield Frequency Response (1/2 meter) of the DAC1.5
The light blue trace represents the DAC1.5 without Mi-Horn while the orange trace includes Mi-Horn installed. Usable bass extension appears to be around 55Hz. The tweeter is set about 6-10dB too hot above 9kHz which likely explains why I felt these speakers were bright. With the Mi-Horn installed it boosted the top end almost an additional 8dB! For the hearing impaired this may be a Godsend. But for those with good hearing, you will likely prefer the more balanced sound without Mi-Horn.
Off Axis Nearfield Frequency Response (1/2 meter) of the DAC1.5
The light blue trace represents the DAC1.5 with Mi-Horn while the orange trace is without Mi-Horn installed. As you can see with Mi-Horn added, the off axis performance is compromised diminished. This becomes even more problematic as you increase the distance between the speakers and listener.