I'm wanting to "warm up" the sound of my system...which consists of Phase Tech PC 9.1 tower speakers(4 ohm, 92 sensitivity, soft dome tweeters), a NAD C352 integrated amp, an Apple TV as a music server connected to a Cambridge Audio DAC Magic. I would like to replace the NAD. I prefer to stay with an integrated amp. I know tubes would sound warmer...however, i would like to stick with solid state gear for the longevity and reliability. Does anyone know which amps, or brand of amps that notoriously have a "warm" sound?