If you look in general, most of our systems are set up in two channel mode.In the surround sound mode, you are not going to see 5 SET amps all feeding into I don't know what kind of processor. If I set up surround sound, It would be through a SS state multichannel amp or a good reciever. One does not set up multi channel systems to do real critical listening. I am more impressed with two channel SACD than with multichannel SACD. This may seem very old fashioned, but so are tube amps.