Let's test all amplifiers for upper and lower -3dB (half rated power) PBW points and score them on a performance chart accordingly. On the one hand you have Class D proponents saying nothing over 20KHz should be measured, talked about, or tested and yet we have vintage amplifiers thatĪ) emit nothing in the HF that needs filtering just to measure, andī) have power bandwidths (-3dB) of 40KHz up to any number you can imagine. OK, let's decide how important it is and what is acceptable and what isn't. Who is specifying that now? They aren't, they are specifying best case at full or half rated power, just before the knee and certainly not back around 250mW or below where the noise dominates. Some of the products people are throwing into the discussion specified their THD (+N in real terms) from 10mW to full rated power, and all others were a minimum of 250mW to rated power and the numbers were worst case. ![]() Every single parameter that makes a product excellent.
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