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Purifi Class D: Junk?

So, from the previous thread about high-end class D the Purifi module was brought up. I decided to get a cheap example from VTV, a simple stereo unit with a single Purifi module and matching Hypex SMPS. Standard input buffer. I got it in yesterday. First impression wasn't what I was expecting: weak, congested dynamics is what stood out to me. I expected greater expression through my ProAc D30Rs. The other problems such as poor soundstage, thin / boring character, etc, I marked up to needing burn-in before evaluating. So it's been 24 hours, I would still expect to get at least the high control / damping of high end class D and dynamic power, but it's just not present.

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?
madavid0

Showing 1 response by yyzsantabarbara

yyzsantabarbara
4,470 posts
 
I've been told by experienced audiophiles here and elsewhere that the default Hypex board is junk
You  also need to ask them about their last hearing test just so you have a proper baseline. There are some pretty good class D out there.

My Peachtree Nova 150, while not as good as my current gear (BM AHB2), was a very good Class D integrated. I now wish I did not sell it since I need an integrated today that will sound good with KEF LS50's and can also tolerate some toddler abuse.

The Purifi Class D is what I am likely going to get for this new requirement but it will cost me more than the Peachtree.
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