MK3 Amp Specifications

MK3 Amp Specifications - Why we stopped using "RMS" and "Peak" power ratings


What are “true watts”? How are they defined? An actual, real-world power-use rating is impossible to determine and is also not relevant when comparing powered loudspeakers because powered loudspeakers are more than amplifiers in a wooden box, they are complete systems including transducers and all the necessary processing. (More on why that’s important later.)  The “true watts” that the loudspeaker uses will change from millisecond to millisecond, from minute to minute and will be different for every moment in every song. Watts are a mathematical construct that represent the maximum potential energy that can be dissipated. The amplifiers produce Voltage that flows through the voice coils. The flow of energy is modulated by the impedance of the coils, which changes with frequency and heat. As the energy flows through the coils, the result is the production of electromotive force and heat. Loudspeakers are inefficient at converting electrical energy into kinetic energy, so the vast majority of the energy that is produced by amplifiers is wasted as heat. 

To consider the number of watts as the most important factor in choosing a loudspeaker system is akin to considering the number of calories as the most important factor in choosing a cough medicine. The most important thing to any intelligent person buying a loudspeaker isn’t how many watts the amplifiers are capable of producing, it’s how many dBSPL can be produced, over what range, by the efficient use of the available power. 

Let’s try another analogy. Knowing how many gallons of fuel will fit in the tank won’t tell you how fast or how far the vehicle will go. The mass of the vehicle, the aerodynamic profile of the vehicle, the power of the engine and the gearing will all influence how fast the vehicle will go. And there will be a trade-off to be made between how fast it will go and how far it will go. The relevance here is that the fuel in the tank represents potential energy and the power rating of an amplifier represents the power that it has the potential to deliver, not what it’s doing all the time. How that power is used makes a difference. 

And another one: Buying a powered loudspeaker is to buying a car as buying an amplifier is to buying a motor. If all you want is a motor, it’s fair to look at the horsepower, because you’re going to build a car, or a truck, around that motor. But when you’re buying a powered loudspeaker, you’re buying a complete system, more like buying a car or truck rather than just buying a motor. When buying a car, would the horsepower figure be the only one you’d look at? Or would there be other things worthy of consideration? Comfort? Handling? Top speed? Braking? Fuel mileage? Reliability? Prestige? Resale value? Passenger capacity? Cargo capacity?  

Let’s imagine that the amplifiers in the Makara could only produce 50 Watts. Now let’s imagine that the sound pressure levels and the frequency response of the Makara were unchanged by the fact that the amplifiers could only produce 50 Watts. What difference would it make to the performance of the loudspeaker? None. It does what it does, whether it does so with 50 Watts or 500 Watts or 5000 Watts or 50,000 Watts. 

When choosing an amplifier, knowing how many Watts it can produce cannot tell you how loud the sound system in which it’s used will play. How loud the system can be depends on the interaction of that amplifier with the loudspeakers to which it’s connected, as well as more other factors than I can list. The Makara, and all other powered loudspeakers, are complete systems, so it’s a far better plan to compare real-world performance, as in what the speakers sound like when listened to side-by-side, than what they look like on paper. Take a test-drive. 

The amplifiers in the Makara can produce 2500Watts each into 4-ohms bridged. Not for very long, but I’m told they can. I have not tested this claim because I cannot use more power than those amplifiers can produce unless I want to risk burning up the drivers. In other words, the output of the amplifiers is limited by the processing to below their maximum capability, which again renders their maximum power rating largely irrelevant. So, since I have more power than I need to drive the woofers to achieve their maximum SPL, then I have more than enough power regardless of what that number is when calculated in Watts. 

Nobody buys a loudspeaker to own a loudspeaker. You buy a loudspeaker, or many, because you want to fill a place with sound, with music, with energy. If you start with the result being a room full of people bouncing to the thickest deepest bass they have ever heard and work your way back and back and back, you’ll find that some higher or lower number of watts that each amplifier is potentially able to produce on a test bench is not going to make a difference to how they feel being carried along by the waves of bass. Because ultimately the watts are irrelevant. How you feel about how you’re making them feel is far more relevant. 
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