I own an HK3480 that drives 2 Polk Model 60s (3 5.25 inch drivers and a 1 inch tweeter) plus a Velodyne sub (12 inch). I also own an RR2150 that drives FOUR Polk Model 70s (4 6 inch drivers and a 1 inch tweeter) plus an Epik Valor sub (15 inch sealed).

The HK3480 does not produce clean sound to SPL levels anywhere close to the RR2150. In addition, the RR2150 has a number of additional features that the HK3480 does not.

In conclusion, the HK3480 is just fine for a 2.1 system for a bedroom or a small to medium size room at low listening levels. However, a larger room and louder listening volumes will be the breaking point where the RR2150 is clearly the superior performer.