Atma-Sphere Class D… Amazing

Also, how humans sense sound pressure does not change from individual to individual; generally, the higher ordered harmonics are used. This is really easy to demonstrate using simple test equipment. Imagine a world where every individual used entirely different hearing perceptual rules! It would be a good basis for a scifi novel 😉

@atmasphere

thanks for the reply.

Of course I am not claiming that the "how" is different in every individual. What I am claiming is that there is enough natural variation among humans in reception, processing, and interpretation of external stimuli that one can not predict with certainty how any one individual will respond, all the more so when the amp is but a piece in a complex system full of external and internal variables. Clearly experimental results with a large enough sample can yield tendencies and generalities, but again, nothing that can predict with certainty on an individual basis. From your standpoint, that’s useful. From mine, not so much as I still need to listen for myself.

I am glad to hear that the feedback from your customers has been positive. It’s clear a lot of time, energy, and thought went into your product. I won’t hold my breath waiting for the measurements- you must have your reasons for not publishing them.

It might be interesting to consider that sound itself only exists in the head of the individual. It’s a back and forth from air pressure changes to electric signals. Our ears are transducers changing the air pressure pulses to electric impulses in our head. It is in our mind that these signals are perceived as sound. A lot of links in that chain that can cause differences in how the end result is perceived.

@fsonicsmith 

Here we go again-the old fallacy that the lack of distortion means more faithful sound reproduction.

How would you define/measure faithful sound reproduction?

If the output doesn't match the input, how can the result be called faithful?

And then we come to digital amps as a category. They are insanely cheap to manufacture as has been pointed out elsewhere in this thread. To my mind, a digital amp is a switching power supply built to drive loudspeakers. If there is a simpler way to harness power from the wall directly to the pre-recorded sound signal it has not yet been invented. Ralph has acknowledged that the box-a plain vanilla box at that-is the major parts cost of this product. When the best switching power supplies sound better than the best linear power supplies I will likewise believe that the best digital amps sound better than the best conventional Class A/Class A/B ss and tubed amps. 

@fsonicsmith Let's clear something up. Class D isn't digital. It's a coincidence that the D and digital use the same letter. Its called class D because at the time (late 1950s) class A, B and C were already taken. Its an analog process.

It behaves a bit differently from a switching power supply. For one thing the switching frequency is a lot higher- often by an order of magnitude. Another thing to understand is that switching power supplies are often used in class D amps but class D amps can run off of conventional power supplies too. But even in SMPSs the noise floor is much lower now than it was 30 years ago. Like anything else people sort this stuff out over time. FWIW our class D is so quiet that most tube amps inject more noise on the AC line.  

@kuribo You do know we have published specs right?

There’s obviously much more to good sound than a lack of distortion.  Japanese companies tripped all over themselves in the 70s/80s to produce the lowest THD specs and by and large produced amps/receivers that sounded awful.  

@kuribo You do know we have published specs right?

If you mean a rather thorough and complete set along the lines of Hypex and Purifi, no. Please provide a link if you have time...Thanks.