I just have bought Marantz 2265 65 watts per channel, into 8 ohms is it ok to run 6ohm spkears on it?

Question

Infinity REFERENCE FOUR speakers by the way thanks

Answer 1

The impedance of a speaker (6 ohms in your case) is partly the electrical resistance of the voicecoil plus the speaker cable, partly the mechanical resistance of the speaker cone and partly a few other things. Impedance is NOT "fixed". The only time a "6-ohm" enclosure is likely to register exactly 6 ohms is probably going to be when the meter puts a little DC (battery) current through it and the enclosure turns out to have that exact DC resistance (very uncommon).

The fact your Marantz measures 65 watts at 8 ohms means that at 6 ohms, it's going to have to work a little  harder to drive the speakers (the lower the speaker impedance, the more work as to be done to move the cone).

As long as you don't overdrive the amp by having the volume constantly too high when it might begin to "clip" (sounds very harsh and distorted) then you will have no problems. In fact, most modern amps (and many not so modern ones too) have cut-outs in the event you do overheat things and it will shutdown, but this isn't recommended :-)

In summary.... it's fine!

Answer 2

Hi. Your Infinity Speakers have a nominal impedance rating of 6 Ohms.The term "nominal",means average,which means there will be a significant impedance variation throughout the speaker's frequency range. A variation as wide as 3 to 40 Ohms is possible. The amount of variation,in addition to how low or high the range, determines how difficult the speaker is to drive. The Amplifier must be able to deal with these impedance variations,producing the amount of power necessary to drive the speaker at any frequency.If the Amplifier is not capable of dealing with the impedance swings,audible distortion occurs.Most modern Receivers are built to handel these variations. So,to answer your question,yes, you can use the combination ,just watch the volume and don't play it very very loud.The Amp. may shut down when played very loud. This is a protection feature to prevent damage to Amp. and Speakers.

EDIT.....Every time the load resistance is halved,the Amplifier will try to double its output. Therefore if your speakers are rated at 4 ohms nominal your amplifier will try to deliver 130 watts to the speaker.To make this happen,the Amplifier's power supply must double its current to the output transisters .So speakers rated at 2 ohms will force your Amplifier to try to deliver 260 watts to the speaker !This continued doubling must stop at some point otherwise disaster will occur.

Answer 3

Yes,

You can run these 6 ohm speakers on your receiver. Actually most good quality receivers can typically go down to 4 ohm without any negative consequences. Marantz falls into the good category. The only thing I would do is monitor the receiver to see if it gets very hot. If so get a cooling fan. Heat is the killer of electronic components. I don't imagine you will have to do this but if you do there are actually small cabinets about the size of a dvd player with fans built in that can sit on top of your receiver. The cheaper way is to buy a 120 volt computer fan from radio shack or the like and plug it into the back of your receiver on the switched outlet(if it has one). Then the fan will turn on and off with the receiver. I have done this in the past and it works well.