They were a model above the 450 which is what I was considering. I auditioned them in March while in California. They were paired with Analysis Ribbons, Benchmark Media DAC1, and Shanling CD. My test CD is by George Mraz(acoustic bass) entitiled "Duke's Place" Track #6 Mood Indigo. The VTL lost the low end and had no punch compared to the Sunfire/Rogue 150's. The Manley however delivered the "tube sound" with solid bass on the same track. We listened to a different VTL amp that was 14 years old with Von Schweikart speakers and it sounded delicious. Go figure. I was surprised/disappointed because of the solid reputation held by VTL in the audiophile community.