About Watt Ratings


Last time when I was in the market for an amplifier, one dealer had commented (I think for Classe amps) that their amps actually deliver for what they are rated for! He mentioned that lot of companies lie/mislead on Watt Ratings. How to figure out what the correct output/Wattage is?

Another question is - the following I took from Monarchy Audio's web site:

'Two Singled-Ended Gain Stages driving a complementary Class A Output bank, which incorporates 8 matched Power MOSFETS, rated at 150 Watts each, for a total dissipating power of 1,200 Watts !'

So the question is the amp is rated at 150 Watts but then they mention that the total power is 1200 watts! I am confused.

Finally in Europe and Asia, the watt ratings are incredibly stated. For e.g. a desktop stereo system is rated at 1000W PMPO!!! What is the relationship between PMPO and RMS watt ratings?

Thanks
harrygoldsmith

Showing 1 response by distortion

I had an "EQ Booster" in my first car. It was the coolest thing. My pimpled teenage face was all grins. If I recall correctly, it had a PMPO rating. I think it was Peak Music Power Output and was a claimed "200watts." Hehe, yeah right.

Of course, in typical teenage excess, I needed more. It wasnt long before I had a shiny new Carver M-240 (120x2 RMS) and a pair of Babb 6x9s. Holy cow, pubescent heaven, and arguably the loudest midrange blaster I have ever heard.

Anywho, RMS is the number to look for and it usually has some additional measurements along with it to better define the test. Such as the sine wave(at 1khz)or sine wave sweep(20 to 20khz) and distortion in percentages at rated power.

But I digress the stats are truly just the tip of the defining iceberg. To make an analogy, lets say you wear "large" Shirts.....but that in no way means you will like all "large Shirts." Color, tailor, fabric, design, etc., etc. will play a more important role. You'll probably try that shirt on to see if you like it. I try to do the same with Hi-Fi purchases.