The Emotiva DR series amps cannot handle low impedance. Yes, they are differential, but

This is a quote from Keith at Emotiva speaking to the question "XPA vs DR Amps - What is the difference?":

"

**In terms of cost and complexity.... each channel on an XPA-DR is equivalent to two high-power channels on an XPA Gen3 and uses two amplifier modules.**

A fully differential balanced amplifier has two amplifier channels operating in a bridge mode.

In electronic terms, each of those two modules sees half of the impedance of the load....

So, in terms of load, when you connect an 8 Ohm speaker, each module sees 4 Ohms, and when you connect a 4 Ohm speaker, each module sees 2 Ohms.

Because each module on the XPA-DR is expected to see a lower load, the power supply in the XPA-DR is configured to supply a lower rail voltage.

It's basically the same power supply - but set differently.

(A lower rail voltage enables the amplifier to operate more efficiently into lower impedance loads.)

"

The way I read this and other explanations by Keith, any speaker connected to a DR series amp will be seen as half the load of what it really is. So if it's a 2Ω load, the amp will see that as a 1Ω load, and the minimum impedance of a 13A, 0.7Ω, would be seen as 0.35Ω, which is something a DR series amp does not want to see.