Axiom Home Page Forums General Discussion Advice from Axiom Owners M80 and Yamaha RX-V1900

The dealer is correct, leave it at 8ohm setting.

And put duct tape over it to prevent tampering.

Hi technically my receiver isnt a RX-V1900, its a HTR-6290, but from what I understand they are identical. Just one is sold at big box stores and one at high end stores. Maybe the HTR-6290 is just a canadian thing.
Well anyways on the HTR-6290 there is no switch on the back. You press and hold the straight button and then press the master on/off then the unit turns on to this advanced menu, then you turn the program button to the desired impedence, then press on/off button.
Im kinda confused as to why yamaha tells you to change the impedence for 4 or 6 ohm speakers. Is it a safety thing? Anyways so if I hook up 4ohm speakers just leave the receiver set to 8ohm.

It's a certification thing. You have it right. If you hook up 4 ohm speakers, leave it set to 8 ohm.

Yes, the manuals have that direction to satisfy UL(Underwriters Laboratories)fire safety requirements. Setting a switch or menu setting to lower than the default(which may be 6 or 8 ohms)simply reduces the voltage which the receiver's power supply section outputs. Following Ohm's Law, when the voltage is reduced, so is the current and power. So, although the possibility of overheating is reduced, tests have shown that the maximum power capability is cut roughly in half. So, regardless of the manual language the lower impedance setting shouldn't be used.

I just wanted to thank everyone for the info. I feel certain that the Yamaha RX-V1900 - HTR-6290 will power the M80s with ease. I looked at that epinion review thing again. The guy said he had Totem speakers. I dont know what the models were, but I looked up Totem speakers and they arent very sensitive, only like 87. So I guess that would explain the guy complaining about having to crank it with the yamaha.