I have a new Yamaha HTR-5440 with 5 identical 2-way speaker systems: 6 ohm, 30watts, 3", with a 1/2" tweeter. These, plus the sub woofer do their job exactly as advertised in this small room. It's okay for movies. In fact, it's great for movies. The fun part was the sound of aircraft recip engines in Pearl Harbor. I should be satisfied, right? Nay. I miss the midrange 3-way bookshelf speakers from the prior stereo system for listening to music. They are 8 ohms, 50 watts. Can I safely introduce these 8 ohm speakers to the new rig? Small and large settings for speakers are available on the receiver, and I believe, individual output levels can be set as well. Oh yes, there >is< an impedance switch on the back, now set generally for the 6 ohm system. I have declined to experiment because I do not want to smoke anything. Please tell me what's wise and safe here. Opinions are welcome, even jokes. Go ahead, make my day. Thanks.