What Class D amps will drive a 2 ohm load

A class D amp can do 2 ohms if the intention is there on the account of the designer. Several things have to be present to really make this so.

* the amplifier must have sufficient current handling ability in the output transistors and power supply
* the amplifier must have sufficient heatsinks as they will run hotter driving 2 ohms
* because of the output filter considerations, the amp should be self-oscillating. In this way it is possible to run enough feedback to allow it to correct for phase shift otherwise imposed by the filter.

     Thank you, atmosphere, for your numerous interesting and very informative posts. 
     Class D Hypex and UcD power module designer, Bruno Putzeys, has stated that there's no such thing as too much feedback and that he's able to make a class D amp sound however he likes but decided his goal would be accuracy.  
     Here are a couple interviews with Bruno Putzey about class D I thought members on this thread might find interesting, relevant and informative:

https://www.soundstageultra.com/index.php/features-menu/general-interest-interviews-menu/455-searchi...

https://www.soundandvision.com/content/bruno-putzeys-head-class-d


Tim

@noble100 Yes, Bruno has been able to design class D amps with loop gain north of 75dB!!

He did acknowledge to us that there was a typo in one of his papers when we pointed out a math error regarding the oscillation criteria. It was not an error in the paper itself though, it really was a genuine typo. Brilliant guy.

Here's  another interview with Bruno Putzey and Lars Risbo on their new Purifi Class D amps.

https://audiophilestyle.com/ca/bits-and-bytes/purifi-audio-and-the-audiophile-style-readers-qa-with-...