No ulterior motive, I just want to know which specs govern those specific functions I mentioned. You're an EE, right? Don't mean to take you to task. I would just like to know.
OK, I think I understand what you are alluding to. If you want parametrics for largely subjective impressions, I'm sorry - you'll need to find someone else to tackle that bit of voodoo. My stated preferences for specification evaluation in regards to power amplifiers are just that - my preferences. They may be unimportant to the next guy and that's fine with me - whatever floats your boat. Your interest in how an amplifier performs no doubt differs from mine as I'm sure our total system objectives differ.
And another response -EV13
>>"Simple: If the manufacturer states something like 0.001% distortion, but doesn't say at what frequency or at what level, its just a meaningless number. Depending on the feedback topology it is "always" ameaningless number.
Or speakers / headphones:
One is specced 5 - 35 KHz
The other speaker 45-19KHz +-3dB
Which would you buy? And why?"<<
I think you are referencing THD, if not I'm not sure what distortion you mean. If you did mean THD, stating that it is "always" a meaningless number throws an awfully broad blanket. Granted, most manufacturers do not state how they test to determine the value and amongst manufacturers it is not simple to make valid comparisons. At the very least, it casts some light on the performance if it's coming from a reputable manufacturer - not much light, agreed despite whatever topology is used.
As to the speaker/headphone specs - neither of your listed items inspire any sense of confidence. Is it on-axis response? Is this an anechoic value? I'd rather see a graph of full power bandwidth with conditions.
For headphones, it would be another can of worms. I think you missed my first post, #41. I noted, that without test conditions including stimuli, most specs have little value.
Cheers