Wyred 4 Sound.....Anyone?????

Marakanetz
According to engineering/physics principles one would assume your statement correct. However, time and experience shows this is not necessarily true.

I brought this point up based on comments and statements I have heard others make. For example I know a guy that went from a 100 watt class A amp (plenty of power for his speakers) to 250 watt mono class D amps which did not have nearly enough power for his speakers.

We can look back into audio history and see "ratings" of amplifiers being mislead by manufacturers. While I am not saying this is the case with Class D, I do fail to understand an amp with two and a half times the rated power failing to have "enough power" compared to a much "smaller" class A amp?

Hence my Q as to a general analogy of Tubed amp power to SS A or A/B power to Class D power. One doesn't see many 500 watt and 1,000 watt Class A or even A/B amps. So why is this "rating" of power needed for class D amps? And is it equivalent power?

Ckoffend, the one example you offered, suggests many possible reasons: the Class D amp was defective, the Class D amp manufacturer overstated the specs, the Class A amp manufacturer understated the specs, the speaker/cables provided an impedance load beyond the rated full output capabilities of the Class D amp, the preceding gear didn't provide the neccessary output for the Class D amp to achieve full power output, the listeners didn't truly appreciate the power output of the Class D amp vis a vis the Class A amp, or something else all together. Small samplings of particular gear doesn't represent the entire technology genre.

" We can look back into audio history and see "ratings" of amplifiers being mislead by manufacturers. While I am not saying this is the case with Class D, I do fail to understand an amp with two and a half times the rated power failing to have "enough power" compared to a much "smaller" class A amp?"

Read article by one of the Spectron designer, Simon Thacher(http://www.enjoythemusic.com/magazine/manufacture/0708/index.html) and you will understand that manufacurers as the rule and customers ALWAYS want power spec in rms i.e. continius.

Its good for bench test but music is not the test tone and as Spectron emphesize - the real power, power that matter is the peak power, its duration and absense of distortion during these periods. Thus as a rule, even small class A amp will outpower big class D amp, as former need huge power supply (big transformer etc) while non Spectron type class D have small swithing power supplies.

Ckoffend and others,

We often take LOUDNESS (in dB) over the power in Watts.
The effect of larger loudness in tube amps per given number of watts isn't only due to the soft clipping, but due to the smaller frequency range especially in the lower-end domain <60Hz where directly-coupled solid states give larger credit. The presence of an output transformer in tube amps(except OTL) dictates this limitation... Even OTLs would drop the power when the speaker impedance drops(in most lower frequency cases)

I totally agree with Bobgates. I have been using the SX1000 monos in my system for the last six months and up until I installed the Wyred 4 Sound PC's the amps sounded dry and non-involving. The detail and dynamics were there, but there was no life to the music. After installing the new power cords the amps have transformed into an integral part of my system making my speakers totally disappear. The soundstage has come to life and has an impressive 3D effect. I am extremely please