Mike,
I used the Dartzeel in stereo only. I see you use 2 stereo amps in a vertical bi amp config so your results would be much different and you looking at $50,000 worth of amps. If your happy that's all that matters.
As you can see the amp doesn't like being below 4 ohms.
Stereophile measurements
I measured 160W into 8 ohms (22dBW), 230W into 4 ohms (20.6dBW), but 162W into 2 ohms (16.1dBW). The manufacturer strongly recommends using the Lo setting if the amplifier is to be used with low impedances. However, the amplifier then delivers significantly lower power at clipping43W into 8 ohms (16.3dBW), 68W into 4 ohms (15.3dBW), and 95W into 2 ohms (13.75dBW)with no reduction in low-power THD.
I used the Dartzeel in stereo only. I see you use 2 stereo amps in a vertical bi amp config so your results would be much different and you looking at $50,000 worth of amps. If your happy that's all that matters.
As you can see the amp doesn't like being below 4 ohms.
Stereophile measurements
I measured 160W into 8 ohms (22dBW), 230W into 4 ohms (20.6dBW), but 162W into 2 ohms (16.1dBW). The manufacturer strongly recommends using the Lo setting if the amplifier is to be used with low impedances. However, the amplifier then delivers significantly lower power at clipping43W into 8 ohms (16.3dBW), 68W into 4 ohms (15.3dBW), and 95W into 2 ohms (13.75dBW)with no reduction in low-power THD.