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RE: Magnepan color recommendation

The ribbon maggies reveal the grain in most class D amp's top end. However, there are several kinds of class D amps. NuForce and NuPrime (same engineers) use a 600khz sine wave modulation, while B&O and Hypex NCore and Ucd use 400khz triangle wave carriers. The top end of the NuForce amps is better, their midrange is impeccable. The top end is not on par with a good tube amp or a great SS class A amp. The lack of compression on the Devialet and other feed forward amps and on the NuForce/Prime is very impressive. Well executed class D based on the other OEM boards can do great from midbass to midrange.

In the deep bass, class D amps tend to fail in maintaining current due to insufficient storage capacitance to bridge the 60hz at high current. Maggies being current hogs at low frequencies really show up the class D amp's limitations.

With these observations I have no trouble understanding Wendell's issue with class D. But try to drive your speakers with your current amp first and then line up some class AB candidates to try out to see if you can do better.


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