Riviera Labs AFM-100 SE Class A Monoi amplifiers- something new and different

[morricab]

Although Riviera and Lamm both use the research about human perception of sound, they do sound quite different to me. I have Riviera APL 01se which I have tried with Lamm M1.2 (owned for a year) and Riviera AFM100se (used for few weeks). In my system Lamm sounded quite forward, midrange based, with a bit of artificial energy. On the other hand Riviera sounds to me very balanced, natural, organic, musical. From what I have heard at shows, I guess closer to Wadax. Riviera and Lamm obviously must have used different research

There is no definitive model on human perception of sound. The more recent ones try to develop a mathematical model based on the ears own self-generated harmonics at various SPLs, coupled with the well known phenomenon of masking. A couple of recent models were developed coming at the problem from different directions. I have no idea if they come up with the same result, however, both clearly acknowledge that THD and IMD as monolithic numbers are utterly useless in making predictions about what listeners think of as a more natural sound.

It is no surprise then to see amps designed with some kind of hearing model (the assumption being each company derived their own model) having significantly higher THD than electronics designed by distortion optimization. If the companies models differ in some significant way, the resulting sound is also likely to be significantly different.

 

[Atmasphere]

Although Riviera and Lamm both use the research about human perception of sound, they do sound quite different to me. I have Riviera APL 01se which I have tried with Lamm M1.2 (owned for a year) and Riviera AFM100se (used for few weeks). In my system Lamm sounded quite forward, midrange based, with a bit of artificial energy. On the other hand Riviera sounds to me very balanced, natural, organic, musical. From what I have heard at shows, I guess closer to Wadax. Riviera and Lamm obviously must have used different research

I doubt it- I think you're hearing the difference in how successfully they were able to reach their goal. I'm very sure the goal was held in common!

If you understand the rules of human hearing and how that applies to engineering, that allows an access to being able to create something that is 'very balanced, natural, organic, musical'. I've heard that description many times.

Designers get into high end audio for a variety of reasons. The ones that do it for the money are often the ones that are only mediocre. The ones that do it to see how musical their creations can be seem to have much better success, even compared to those that try for the least distortion or other bench specs.