"Benchmark had a whole section on why balanced/differential output doesn’t make sense for headphones." Can you point us to this Benchmark section? There is no such a thing as "balanced headphones" . All are passive devices that can be connected to the amp with either single ended or pull/push cable from 4 pin amp output. Unfortunately, that 4pin output is commonly called "balanced" and frequently interpreted as balanced in the interconnector sense, which is completely different. All this is confusing many people. I am curious to see how Benchmark has explained that pull/push doesn't make sense. BTW, pull/push connector is not about getting more power, it is about how the power is delivered (time function) to the HPs.