Class D = Trash?

Hi George,
      I think you're seriously under-estimating the performance of the many current good class D amps using switching frequencies around 5oo kHz.  I say this based on my personal experiences with 3 different class D amps over the past 3 years. 
      Since you've repeatedly refused. or are unable, to answer my pertinent questions of "how many current class D amps you've listened to?" and "What are the telltale audible signs that result from switching frequencies being too low and affecting the audible range?", I now have a new theory about why you continually make this claim without anything close to scientific or even subjective or anecdotal evidence:

   I now believe you are the sort that enjoys reading and learning about audio technology and equipment but also one that has very little to no actual experience of listening to audio equipment employing newer technology.  This is the only conclusion I'm able to reach given your apparent lack of knowledge about how good some current class D amps perform utilizing supposedly switching frequencies that are too low and your total lack of responses concerning what your theorized affects on the audible range actually sound like.
   There's also the matter of you seriously over-estimating the improvements that will result from using higher switching frequencies in the 3-5 mHz range.  I think the new faster switching FETs are more likely to improve class D performance than higher switching frequencies.

Later,
  Tim   

There's also the matter of you seriously over-estimating the improvements that will result from using higher switching frequencies in the 3-5 mHz range.  I think the new faster switching FETs are more likely to improve class D performance than higher switching frequencies.

Still can't see the forest through the trees, once more and I can't make it any simpler.
It's the output filter that you never mention that has to get rid of the switching frequency noise that is the problem, 
And that output filter stops becoming a problem "if" the switching frequency is "much higher", as it will be too.  
And then it will not have effects that today reach down to 5khz sometime 3khz as they do now, with today's switching frequency. 


Cheers George 

    George,

You stated:  "All your doing at the moment is trying to protecting your investment so it won’t take a monitory nose dive when this new technology becomes mainstream and finally puts Class-D into the hi-end Audio bracket, with today’s great linear amps
Keep that finger on the sell button and press it before they become obsolete."

     Protecting my investment?  I've never considered my amplifiers an investment since I began buying them a few dozen amps ago.  As I recall, the vast majority of "investments" I've made in my history of buying amps have been of the 'buy high and sell low' variety.  Hardly a recipe for success.

     Fortunately, every "investment" I've made in the many amp transactions in my lifetime were made with an expected ROI (return on investment) of improved sound quality in my system, not a financial one.

     Since I consider improved system sound quality as my ROI when buying an amp, my 3 "investments" of about $3,500 in class D amps have already been extraordinarily successful, with Sonic Gains already greatly exceeding my expectations. 
     The Sonic Gains continue to flow freely from these amazing, small, light, great sounding, neutral, low noise, powerful, highly dynamic, detailed  and affordable "investments".  Due to the very low levels of heat they produce, they'll likely continue to reliably provide their sonic dividends for many years to come. 
     Regardless of whether higher switching frequencies and faster/better FETs are able to even further improve class D amp performance,  my current class D mono-blocks are providing remarkable performance, with absolutely no detectable sonic artifacts/anomalies in the audible range, at switching frequencies in the mid 500kHz range. I, therefore, have no need to await affordable higher switching frequency class D amps to enjoy their promised benefit of not negatively affecting performance within the audible range since I've already been enjoying this for the last 3 years.
     While I already know and appreciate how spectacular class D sounds without the switching frequencies having affects within the audible range, out of curiosity I'll likely still audition a pair to hear how the faster/better FETs affect class D performance.

Later,
 Tim

Again can't see the forest through the trees.

Not one mention of the output filter that has to address the switching noise of the switching frequency, which is the Achilles Heel with present day switching frequencies.

Cheers George