Originally Posted by M Code
We need to understand more clearly the meaning of Certified 4 Ohms..
Denon needs to clarify this, Does it mean that now their AVRs will have more
power into 4 Ohms @ low THD?
Or is it simply a marketing term that limits the power supply voltage as done by the competition for the last 10 years..
Just my $0.05...
If you actually HAVE 4 ohm speakers (as MOST speakers really are now), you will possibly get more power to the speakers at that setting because the available peak current should be greater. There are very few speakers that are REALLY 8 ohms; most are less than 6 ohms over much of the frequency range. Deceptive labeling is common.
On the other hand, AVRs from NAD and Cambridge Audio have always engineered their receivers with heftier power supplies and much better drive current capability than the competition, while Yamaha and and others seem to go for peak power rating into an 8 ohm resistor load and don't do well when driving real speakers, ending up with high distortion at peaks.
In other words, NAD and Cambridge engineer for the real world, driving real speakers and keeping distortion low. The competition seems to care only about the rather misleading 8 ohm "power" numbers they can put on a spec sheet, not real performance or low real-world distortion.
Those who use the ears they were given and listen to the amplifiers and/or receivers will find which sounds better. Those who wish to buy according to spec sheets will end up being the gullible victims of the companies that play that game.
It would be nice if Yamaha and Pioneer and Onkyo would start engineering their products better, but they have a long history of shoddy engineering, and I will be shocked if it changes much. But hey; if someone thinks they can buy an AVR that is anything but cheap junk for $400 or $500 or so, that is just silly; let the buyer beware.
I bought a Yamaha 125-watt integrated amplifier for $800 in 1980 (equal to $2000 or more today), and when I got it home it would go into oscillation when driving my low-impedance speakers (it would emulate an air-raid siren). It was a piece of crap. It even said not to use any speaker lower than 8 ohms in the manual. For that price?? What crap.
I replaced it with a $200 NAD 3020, which sounded very much better and drove my Polk RTA12 speakers as loud as you could want.
Just another example of Yamaha's great engineering over the years