New Peachtree Buzzing


I picked up a Peachtree Nova 150. I love the look and sound. It's powering a pair of Neat Iota speakers for my computer. I also plan to eventually add a turntable and sonos connect. 

When I plug in the unit and power it up I get a buzz that my phone measures at 8.4kHz. I went back to the dealer and their floor model does this as well. I'm in the process of exchanging the amp with Peachtree. 

I guess my question is... Do these switch mode power supplies frequently do this? I recall in CRT days being driven crazy by the high pitch whine/buzz. Since the amp is 2.5" from me should I just be looking for a big toroidal type power supply? Or is it a fluke that 2 of 2 units had this and I should continue with the Peachtree. 

I was considering Marantz HD-amp1 but I'm concerned about power output for my not overly sensitive speakers should I ever move the setup to a larger room. 

Thanks. 
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Showing 2 responses by robr45

CMX-2 will provide good piece of mind and may even clean up the ac line for you. 
It might be DC offset from your ac line. Unfortunately it is tough to prove unless you have a good filter you could try.