It depends on the speaker, the Kef LS50 is a little hard to drive in the bass with 4ohms and -55 degrees phase angle, this could equate to a load seen by the amp as low as 2ohms at that frequency, 100-200hz.
The Halo can push good current for this load, I don’t think the NAD could equal that.
As well the Halo is designed by a very highly regarded designer, "John Curl" you just have to look at his cred.
Cheers George