hifi engine

8 ohms = 125 watts , 6 ohms = ?

8 ohms = 125 watts , 6 ohms = ?



Re: 8 ohms = 125 watts , 6 ohms = ?

More, possibly around 150-190 watts, but you need to check the specs to know exactly how much. In a perfect amp with linear power delivery there would be a doubling of power with every halving of impedance, but most amps don't manage this, and some are only happy within a very small impedance range. That's why loudspeakers that are seen as tricky loads (wildly varying impedance with frequency) need a decent amp to perform well.

krokkor's picture

Re: 8 ohms = 125 watts , 6 ohms = ?

Hi,

your amp is actually delivery a 31 Veff signal on the 8 ohms load.
At the same voltage level on 6 ohms load the power output will be 166 W.

This in a perfect world and in a perfect amp.

Due to the Iload augmentation with the 6 ohms load may be the power supply will decrease his end stage's voltage so the power will be less than the 166 W calculated "on the paper".

If your amp have not Iout limiter circuits and an adequately dimensioned power supply circuit the 166 W power above listed could be the exactly power on a 6 ohms load.

Cheers

Krokkor

Re: 8 ohms = 125 watts , 6 ohms = ?

Wow, that much! The Yamaha RX 1130 is rated 125 watts in 8 ohms and the speakers (Wharfedale 8.4)are rated 150 and they are 6 ohms. No wonder, when I set the volume 3/4 I could notice that the speakers were having quite a beating. Thanks

karodimitrov's picture

Re: 8 ohms = 125 watts , 6 ohms = ?

What was said above is absolutely true.If you really want to know how many watts gives your amplifier at 6 ohm load and if you get a chance - apply signal-1 kHz from the signal generator with the appropriate input voltage,Connect to the output of the amplifier 6 ohm resistor( Kanthal - FeCrAl)and measure the output voltage-AC.Then with Ohm's law you can calculate the power of your amplifier.U2/R.