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RE: Or, perhaps, it is the Buckeye input amplifier to blame?

Thanks for the info and I recant my skepticism! I looked at JA's measurements again and none of them are bad though the HF IMD is way, way higher than the Purifi datasheet but still not bad in absolute terms and, as JA noted, the energy in music rolls off pretty quickly so you'd certainly never encounter 50W at those frequencies! Even dropping the power by 20dB to a still high 5W those third order IMD terms would drop by 40dB and the fifth order terms by 60dB. Out of idle curiosity, I went to ASR to look for any Purifi measurements and found a whole thread about the Stereophile Buckeye review - lot's of conjecture until someone found the announcement from Purifi about the bad modules. I would be interested to know what happened, maybe a wrong value component got loaded into the SMT machine? But, I would have hoped that Purifi would have caught it at final test, maybe they didn't routinely do a high power IMD test and their test equipment doesn't have the resolution of an AP system to catch errors in very low distortion levels? Buckeye posted to the ASR thread and, it seems, they don't do any quantitative unit testing - a 'functional' test and a listening test. Maybe Buckeye don't have the resources for test equipment but, IMO, live by not testing, die by not testing. At least Buckeye now know their listening test isn't that effective so they could drop that:)

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