Considering the length of time it has taken for the 978 to even appear, unfortunately, it may remain mythical forever. I don't know about the 671 but as a result of giving up on the appearance of the Outlaw Pre-Pro, a few months ago I bought a Yamaha RXA 2000 on sale and have 2 M80s and a VP160 across the front, a dynamite combination and it sounds great with plenty of volume.