I don’t post here often, but I have a set up very like you describe. The VSA vr4 jr’s have built in crossovers at 200hz and are easy to bi-amp. I use a Mac 462 for tv and movies but use it as bass amp for music. I currently have 3 tube amps that I’m comparing now, an ARC D 70 II, a MAC 275 vi amp, and a MAC 1500 receiver with the preamp bypassed to use the amp section only.
All three sound really good by themselves, but really sing when the bass load is removed. If interested, I liked the ARC best, followed by the 1500, then the 275, though each amp does certain things better than others.
The 275 has more air around the instruments, but less dynamic jump, though not sluggish or heavy. The D 70 has more dynamic jump, but needs 6550’s to really sound best. The 1500 was a real surprise, almost matching the ARC in dynamics. Tube sets are very important and needed a selection process to get each to sound its best. 275, winged C 6550’s, nos Sylvania at7s, and os Teles ax7’s. The stock tubes were grey and sluggish, but the amp came alive with the upgraded tubes. An expensive upgrade. The D 70 is best with 6550’s and os 6dj’s etc. The 1500 needed TS 7591’s, and os Teles au7’s and a Tele ax7. Hope this helps.
Each is acceptable with the right components, with the 275 in most need of careful system matching.
The above assessment was made without the 462 running the bass, to give a better picture of each amp alone.