For 20+ years I've used mostly low-end Onkyo/Yamaha type of receivers. I am ready to upgrade to the next best thing . I listen mostly to vinyl . I also listen at "low" volumes. I never crank it. My speakers are 4 ohm floorstanding ones, see specs here: http://www.hometheaterequipment.com...da563780b312190&attachmentid=506&d=1324048190 Should I consider tube amp? Or is that ruled out since I listen at low volumes? Would a simple 20W integrated amp be enough? Or some pre-amp/power amp combo?