A power amplifier connects a reservoir of energy to the loudspeaker through a type of valve (solid state or vacuum tube) controlled by the input stage. If the input stage has done a good job of preserving music’s subtle details, textures, timing and phase information, transferring it without loss to the loudspeaker can be accomplished in a few ways: the most efficient is Class D.

The history of Class D amplifiers stretches back to the 1950s, though those early designs—even those into the late 1990s—had much to be desired, sonically. Modern designs capable of high linearity and neutral sound quality weren’t available until the early 2000s, and into late 2015.

There is a lot of misinformation surrounding class D amplifiers. Perhaps the most common is they are digital, which is incorrect. A Class D amplification stage is an analog process, known as Pulse Width Modulation (PWM). Class D amplifiers do switch in on/off fashion, which is likely the reason they wrongly acquired the “digital” moniker.

The Stellar M700 has a massive power supply and ultra-linear high Wattage power amplification stage, based on a modern Class D ICE module, designed in Denmark.

All power amplification stages have strengths and weakness. Class D output stages are no different. Their strengths are many: near-perfect linearity, low distortion, high efficiency. Areas where they do not excel, are most notable in high-frequency extremes. Because Class D amplifiers require an output filter to remove their switching noise, they do not have frequency extremes into the many hundreds of thousands of Hertz. Depending on their design modern Class D amplifiers, like the type used in Stellar, extend high frequencies to about 50kHz. Human hearing limitations are 20kHz, though most listeners rarely have hearing exceeding half that.

The Stellar M700 provides excellent frequency extremes, low distortion, high efficiency, high damping factor, and a generous and powerful output of 700 Watts into the most common loudspeaker loads of 4Ω. Plenty of horsepower for even the most demanding loudspeakers.

Is 700 Watts too much for my loudspeakers?

No. One of the common audio myths is too much power for speakers. The truth is, underpowering a loudspeaker is potentially more damaging than over powering it. Square waves (clipping) causes more tweeter and driver damage to speakers than anything else. The massively powerful nature of the M700 works well with any loudspeaker, providing huge amounts of headroom and effortless sound quality for even the most demanding orchestral crescendos.