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Switching amps are limited by their power supplies.

Posted by Al Sekela (A) on July 25, 2006 at 13:31:57

In Reply to: back EMF posted by MM on July 25, 2006 at 07:27:39:

The ability of an amp of any variety to absorb reactive currents (what you call back-EMF) depends on the power supply.

In a switching amp, the "output" transistors switch between ground and the DC rail. How much the DC rail looks like an AC ground to the speaker depends on the impedance of the power supply. A small power supply will keep the amp from properly damping the speaker. With an amp rated at 15 WPC, I suspect the switching transistors are also small and have higher impedance than desired.

Most switching amps use switching power supplies, which generate lots of RF noise. This is why most of them are considered to be veiled and have an artificial midrange and treble.

I'm auditioning Gilmore Raptor 500 watt monoblocks on my MG-20s. These amps are the best I've heard. They have oversized linear power supplies, and have no trouble with RF noise or damping the speakers.

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