Hello, does anyone know the current engineering revision level of the Purifi class (J)unk Amplifiers? Putz apparently says Class A could do with some improvements, but Class (J)unk cannot stand on its own merits. Someone said that there were amplifiers that were over $20000 with these modules inside them? Talk about a ripoff. The % profit margin must be in the 4 digits.
Purifi Class D: Junk?
Could it be an impedance mismatch? Other manufacturers selling the Purifi with their custom input buffers are reporting 47k Ohms. VTV doesn't say in the manual or on the site. I checked the Purifi data sheet which reports...2.2k Ohms on SE???? That can't be right?? That's absurdly low! Am I reading the right spec? My preamp has an output impedance of 230 Ohms. Can someone confirm that the stock Purifi has this ultra-low input impedance?
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Any Purifi module isn't junk! - they are all excellent. The problem was the mix and match approach that spawned this old thread had the expected result. If you want a class D amp to sound good, you have to give it a respectable power supply like you would with any other amplifier. If that happens to be a switch mode supply, to really make it work it should be designed for the application rather than something off the shelf, even if that off the shelf source is excellent. The input buffer can have a big effect too. Its a sad state of affairs that so many class D amps get shot down on this account. Any bugs in either of these departments and the whole thing goes down the loo. If these issues are properly controlled you find that a class D amp can be just as good as the best class A amps price no object. |
@erik_squires Hence 'spawned this old thread'...
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- 259 posts total