Questions For Interview With Bruno Putzeys & Lars Risbo About Purifi Audio

[mfsoa]

Is there an advantage to running a low switching frequency of 500 kHz when at least one of your competitors is switching at many times that frequency?

 

Thanks.

[mfsoa]

Let's please include the Digital Amplifier Company (in good ol' Allentown PA) in discussions of independent (non-commercial module) Class D designers. Tommy O'Brian has been designing and building his own Class D designs for decades.

 

In every case I heard I felt that the DAC amps significantly outperformed the competing module-based amps I heard, either borrowed or owned. 

 

Comparison to apparently highly regarded AB amps was instructive. It was too funny when I had an audio group over and someone swapped in a Modwright KWA 100 SE for one of the old big Cherry amps without me knowing it. I walked into the room to see a dozen really downcast faces and this lifeless sound. Everyone was kind of staring at the ground in disbelief at how much better the DAC amp was. I assumed the SE was defective but apparently it was not.  And now, Tommy's newer amps have surpassed that old Cherry with significant engineering and sound quality improvements.

 

It is stunning when one realizes how much information is not making out of one's previous amp when a DAC amp is installed, the difference is so striking.