I'm thinking to buy a Denon AVR-1603 with JBL SCS178 speakers. Denon specifications says for the front, center and sorround 70W+70W for 8 ohms and 100W+100W for 6 ohms. The speakers JBL SCS178 have 4 ohms of impedance. In Denon User's manual I've seen the following note about the speaker impedance and the protection circuit: "The protector circuit may be activated if the set is played for long periods of time at high volumes when speakers with an impedance lower than the specified impedance (for example speakers with an impedance of lower than 4 ohms) are connected. If the protector circuit is activated, the speaker output is cut off ...." As in the note it says "impedance lower than 4 ohms" I don't really know if it would be a good choice.