How much ohms???

[mustaine]

does anyone know if the cambridge audio 540R receiver can handle down to 4ohms? which is the lowest it can go? i am thinking of buying 4.5 ohm speakers...

thanks

 

[jamie2112]

Yes, from everything I have read it will handle 4ohm loads with no problem..

 

[Rickster71]

My gut reaction is to say 'no', if you listen at high levels.
If you don't play loud, then give it a shot, and check to see how hot it gets.

It will output 100 watts in stereo, (8ohms) and downgrades to 80 watts, all channels driven. That doesn't instill much confidence in it driving a greater load.
The problem is heat, and heat shortens the life of electronics.
The impedance of a speaker changes while it's played, I'll bet it dips lower with use.
Give it a try, see how hot it gets.

 

[jamie2112]

I read some reviews of this receiver and quite a few people were running this with 4 ohm speakers. I would agree with Rick on the fact that if you listen at loud volumes you may want to look for a more powerful unit.

 

[billy p]

does anyone know if the cambridge audio 540R receiver can handle down to 4ohms? which is the lowest it can go? i am thinking of buying 4.5 ohm speakers...

thanks

Having read some of your other post here and elsewhere, it would appear that you've purchased Dali Ikon 6's and they are rated @ 6ohm with a sensitivity of 91.5! It appears that you are very uncertain of your 540r when others here have already given you assurance of its stability. Try it out like Rick mentioned and if overheating occurs than you may have a problem in which you'll have to deal with.

 

[bandphan]

Which speakers did you deciede on? Also have you look at the impedence plot for them and found out where the lowest dips are located?

 

[Midcow2]

separate 2 channel amp needs or higher end AVR

Is this the AVR you have?

Azur 540R (Version 3) - the ultimate 6.1 HDMI AV Receiver

100 watts rms per channel @ 8 ohms, 2 channels driven

80 watts rms per channel @ 8 ohms, all channels driven

=====

That is a medium powered receiver. Yu can drive 8 ohm speakers fairly loud.

Remember power = volts* current = current^2 * R

Most AVRs are current limited , so when you go from 8 ohms to 4 ohms you cut your effective power in half, in this case to 40 watts. which is probably not enough to drive the speakers even though that have a little better than average ( 91 dB) efficiency.
======

Solutions:
(1) Get a higher end AVR
(2) take pre-out from your 540R and connect to a separate two channel AMP to drive the front speakers. Example Behringer A500 Reference Studio Power Amplifier $165
http://bsless.stores.yahoo.net/a500.html 230 watts RMS into 4 ohms.
(3) Keep your current 540R and find some 8 ohm speakers you like.

 

[mustaine]

Which speakers did you deciede on? Also have you look at the impedence plot for them and found out where the lowest dips are located?

i am leaning towards Dali Ikon6. the impedence plot (from stereophile) shows a minimum value of 4.25 ohms at 3.5kHz. So i guess everything will be allright then, especially since i listen to my music at moderate levels.

thanks for your help guys

 

[mustaine]

Having read some of your other post here and elsewhere


LOL... I guess i must be famous by now among the av forums

 

[3db]

i am leaning towards Dali Ikon6. the impedence plot (from stereophile) shows a minimum value of 4.25 ohms at 3.5kHz. So i guess everything will be allright then, especially since i listen to my music at moderate levels.

thanks for your help guys

That impedance dip of 4.25 ohms at 3.5 Khz isn't a serious load for the recevier. If that dipped occured somewhere at a 100Hz or below, I would definately look into another recevier. Its the lower frequencies that causes amps to work, not the midrange so much.

 

[rnatalli]

Having owned a 540R, I can say it has a very robust amp section. I doubt you'll have any issues using those speakers.