Rick, I was going by their website and the Stereophile Buyers Guide for 2004 (2005 was sold out). The RX-1052 has no four ohm rating on their web site, in the manual, or in the magazine. The buyers guide does however have 4ohm ratings for integrated amps and power amps. And, it is indeed up 50% on the integrated amps. The power amps range from 30% to about 70%!!

Shane D