I always thought that the rsx1056 should not be used with 4ohm speakers.Atleast that's what rotel told me a while back when i was inquiring about dynaudio speakers,so i ended up with B&W 603s3's/lcr600(really liked them anyway).Well i have upgraded my speakers to a System Audio setup(sa1750/sa720av/sa505's)these speakers are 4-8ohm and 90db and fantastic by the way(apparently not that well know in U.S.A).Thinking that the rsx1056 was going to need an amp with these speakers i began inquiring into the class d amps specifically the red dragon amp1.In the mean time i just used the rsx1056 w/o an amp until i would decide.Beleive me the rsx1056 does a fine job with these speakers so much so that i think an amp would probably be a waste of money.So if anyone who has an rsx1056 and was afraid to use 4ohm speakers do not be afraid to use them.I really dont know why Rotel advises against it.Is it that my speakers are 90db the reason for the rsx1056 performing so well?You tell me.
rotel rsx1056 w/4 ohm speakers;misconception
Collapse
This topic is closed.
X
X
-
I think the reason that 4 Ohm speakers are not recommended is that the output devices fitted to the receiver's power amp section cannot provide the current at high levels into loads with nominal impedances of less than 8 Ohms. If the output device (transistor) exceeds the rated current it will practically blow-up, leaving your receiver dead.
This is why 4 Ohm speakers are not advised, so you should be afraid to use them. It's not that they wont work but the fact that you will stress the amplifier at high levels, ultimately leading to the demise of your receiver and I'm pretty sure that this will not be covered under warranty.
My advice therefore is to be careful.
All the best.Best regards,- Bottom
-
Originally posted by DestructionI think the reason that 4 Ohm speakers are not recommended is that the output devices fitted to the receiver's power amp section cannot provide the current at high levels into loads with nominal impedances of less than 8 Ohms. If the output device (transistor) exceeds the rated current it will practically blow-up, leaving your receiver dead.
This is why 4 Ohm speakers are not advised, so you should be afraid to use them. It's not that they wont work but the fact that you will stress the amplifier at high levels, ultimately leading to the demise of your receiver and I'm pretty sure that this will not be covered under warranty.
My advice therefore is to be careful.
All the best.- Bottom
Comment
-
A separate amp will probably be best in the long run, even if the receiver does not run exceedingly hot. It is usually the instantaneous current drawn from the device that will damage it. This is most likely to happen at low frequencies and at high level, especially if you set your speakers to large.
You could look at the Rotel class D amps as these are pretty stable with difficult loads?
8)Best regards,- Bottom
Comment
-
Originally posted by DestructionI think the reason that 4 Ohm speakers are not recommended is that the output devices fitted to the receiver's power amp section cannot provide the current at high levels into loads with nominal impedances of less than 8 Ohms. If the output device (transistor) exceeds the rated current it will practically blow-up, leaving your receiver dead.
This is why 4 Ohm speakers are not advised, so you should be afraid to use them. It's not that they wont work but the fact that you will stress the amplifier at high levels, ultimately leading to the demise of your receiver and I'm pretty sure that this will not be covered under warranty.
My advice therefore is to be careful.
All the best.
To see for yourself:
Rotel FAQ- Bottom
Comment
-
Originally posted by shadow 8Again, you will have no problem driving 4 ohm speakers. If you want to drive inefficient speakers like Dynaudio to near reference level you would likely need more power, but the B&W speakers you have are a breeze for the 1056.- Bottom
Comment
-
Not true at all. The previous model, the RSX-1055 has identical amp sections and Rotel told me 4 ohm speakers are fine - this is also listed in a Rotel FAQ sheet. I beleive the reason for the 4 ohm warning is purely a legal/UL rating thing. In the real world, unless your speakers are unusually inefficient and you have a large room, 4 ohms is a non issue. I have used 4 ohm speakers for the last 4 years with my RSX-1055. Ignore the fallacies.
To see for yourself:
Whilst I agree with you that 4 Ohms will work provided the level is not too high, it still remains that there is a possibility of damage that would not be covered by the manufacturers warranty - at least in the EU anyway.
The minimum 8 Ohms rating is not a legal issue believe me, however I do know that US and EU standards are different so maybe this explains it.
Obviously this debate could go on a bit so to keep things civil we may have to agree to disagree on this occasion. 8)Best regards,- Bottom
Comment
-
FWIW, i contacted rotel tech support today in regards to a small problem i'm having with the rsx1056.They advise me it's probably a software glitch and that a new one(software) is coming out in a few days that should take care of the problem.While i was talking to him i went ahead and asked in regards to 4ohm speakers with the rsx1056.He said as long as there is ventilation there wont be a problem.- Bottom
Comment
Comment