As Noble 100 stated in his experience with a quality Class D amp, I fully concur; its the lack of noise, extremely low distortion and amazing detail that struck me right off.
And since I am such a 'green eco' type, I don't feel guilty with running these mono's for hours on end as they are so efficient.
Here is an interesting point of note: my Anthem M1's do not come with a schematic which I wanted to read with an engineer friend of mine. I called Anthem and asked if I could get a copy and they told me no. They will not supply any schematics to the public, only to authorized service technicians. I asked why they have this policy and I was told that they invested millions of dollars and years of time developing the M1 design and they consider it proprietary in all respects. I can understand this philosophy and I don't blame them.
I was interested in how they handled the mitigation of high frequency harshness which inexpensive Class D designs are known to suffer. The M1 is so smooth that it's uncanny. And if anyone is interesting in looking online at some of the YouTube videos on it, you'll be quite impressed with the copper heat pipes which are liquid filled (some type of alcohol I am told) which draw the heat through convection currents away from the finals to the heat sinks on the side of the amp. These amps feel like Capt. Kirk's USS Enterprise to me :)
And since I am such a 'green eco' type, I don't feel guilty with running these mono's for hours on end as they are so efficient.
Here is an interesting point of note: my Anthem M1's do not come with a schematic which I wanted to read with an engineer friend of mine. I called Anthem and asked if I could get a copy and they told me no. They will not supply any schematics to the public, only to authorized service technicians. I asked why they have this policy and I was told that they invested millions of dollars and years of time developing the M1 design and they consider it proprietary in all respects. I can understand this philosophy and I don't blame them.
I was interested in how they handled the mitigation of high frequency harshness which inexpensive Class D designs are known to suffer. The M1 is so smooth that it's uncanny. And if anyone is interesting in looking online at some of the YouTube videos on it, you'll be quite impressed with the copper heat pipes which are liquid filled (some type of alcohol I am told) which draw the heat through convection currents away from the finals to the heat sinks on the side of the amp. These amps feel like Capt. Kirk's USS Enterprise to me :)