I tracked down the BAS tests, reported in their
Speaker publication (Fall 2017). The material is of course copyrighted so I won't quote much. However for anyone interested, and for anyone with access to the publication, it is worthwhile.
A problem for manufacturers producing for the real world is cost to the consumer v intended application. Looking at a 'graph' printout has to be interpreted carefully, whether it's power, or distortion. In the BAS article, two designers (Bob Carver--then at Sunfire, and Tom Holman, audio engineering director at Apple, designer of the Apt electronics) discussed their opinions and reservations about consumers using something like the Power Cube for purchasing valuations.
Editor Alvin Foster wrote the following:
Not everyone is in agreement with AudioGraph CEO Lars Ohlen about the universality of all amplifiers outputting a perfect cube with the loads specified in the IHF-A-202 standard. Some well-known amplifier designers believe that test selection and performance required depend on how the amplifier will be used, especially where music is the ultimate signal. They believe that an amp need not pass all AudioGraph tests to be more than adequate for music playback. Passing all of the tests might be more appropriate for amps in certain industrial applications.
If ASR is going to provide AudioGraph measurements (which I hope will be the case), a discussion of its practical (to the consumer) use ought to follow. In any case, because it's an old design, I am attaching the Phase Linear 700 AudioGraph. Phase Linear was one of the first, to the consumer, high powered amplifiers. FYI
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