Amp/Preamp Asylum

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40A don't mean squat IMHO

Posted by AbeCollins on July 12, 2022 at 08:47:34:
One of my problems with VTV Purify is that VTV doesn't specify power output for their amps. They simply provide a data sheet for the modules. There are examples of different Class D amps in the marketplace that use a specific module yet the amp manufacturer will show different power output in their specs. Some of this might be power supply related, how the input stage drives the module, and some of it is related to power output at specific distortion levels.

If we look at the Purify 1ET400A module datasheet it shows 425wpc at a rather high 1% THD at 4 Ohms - but the charts show significantly less than 1/2 that 425wpc power at 8 Ohms AND these figures are given at a high 1% distortion(!) so it will be significantly less powerful yet again at 0.1% or lower distortion.

Bottom line is, VTV Purify is not as powerful as they might seem to be achieving their claimed power levels at 4 Ohms at rather high distortion levels.

They play similar specmanship games with their other amps.