ClassD- Total discrete except that of comparator.

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Has anybody used this ClassD amp? I found it on this site. before I get ready actual hardware I tried to Simulate it using Proteus ISIS, While simulating I found that the amplifier works only between 100Hz to 400Hz, with input of 140mVpp max. but in the same tread you will find alike circuit used in some commercial Subwoofer design. So my worries is if my simulation is going wrong? Or if anybody else here has any experience with this design.
 

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