The Sansui AU-505, rated at 18 watts/channel, delivers over 45 watts/channel into the 4 ohm Braun L830s. It sounds more transparent (to me), more musical (to me) and has a bigger sound stage (to me) than a Marantz 2270.Through the Brauns, I'm enjoying some of the best sound I've experienced in my place since the blog started more than 2 years ago. Wow.