But your unending beating of this very dead horse is silly on a forum like this one.Īnd you are straw-horsing Class D proponents by claiming they say no measurement above 20kHz matters when you know full well that is not true.
If you don't like it, that's your prerogative.
The fact that Class D is measured with an ultrasonic filter is well-known and the reason is well-understood, including by you, and you know full well it has nothing to do with poor design, poor engineering, or audible issues. It's saying you will discount whatever you don't like by pointing to a single parameter - regardless of whether it's actually relevant to performance - but then on the other hand you will hold up whatever you do like by "looking at the big picture" and not focusing on any particular measurement. You can't say "every single parameter" and then say "not zooming in on a singular measurement, but looking at the big picture" - that's sophistry. What suggestions of yore do you have for gear that has floated over your bench in the past and really impressed you? What gear did you make proclamations of of "instrument quality waveforms" or "the best you've ever tested"? I have a ton of gear, but I'm on the other side of the world (with no AP ) and I know there's members with some really good vintage gear. Maybe uncovering possibly very special vintage products languishing in members' basements that Amir (or yourself) might test if the member or the item is close enough. Not zooming in on a singular measurement, but looking at the big picture. What suggestions of yore do you have for gear that has floated over your bench in the past and really impressed you? What gear did you make proclamations of "instrument quality waveforms" or "the best you've ever tested"? We all know that on a level playing field, the measurable differences between some vintage gear and modern are going to be close and most likely utterly inaudible. This thread is about looking for worthy challengers to the current fashionable SOTA gear. Or were they simply great in some areas (whatever the flavour of the month happened to be) and not so good in others? There has always been a fashion in HiFi, and right now, we are just in another fashion moment. Is the product easy to use, enjoyable in operation? Do they make noises/cracks/thumps etc? Is there any audible buzz/hum or hiss either physically or electrically? Do they shut-down when they shouldn't? Can you get parts at a reasonable price and is the product good value to start with? We know some of those early Hitachi MOSFET (K134/5 J149/50) designs (Perreaux/Hafler/Nikko etc) are virtually as good as it got for the time (1980s) and still stack up now. (no screwdrivers across the outputs- that just not fair)Īre they well built? Will they last more than the warranty period? We have 40+ year old loyal products being suggested in this thread- that is surely an indication of fitness for purpose. They are built for it- or at least the vintage ones were. Cook them for an hour and see what happens. Burst power into half rated load impedances. Test amplifiers single channel, both channels, into 8/4 and 2 ohms. We know the Class D aficionados will be up in arms and say it's not important. 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.