The pair of BHK600’s is still at TMR
You can get a $8k trade-in credit on a new pair now, and I have more credit than that. When PSA has a sale on amps (and they will), the TMR would have a tough time selling this pair.
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Don’t the sales usually eliminate the trade-in credit option?
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It depends. Sometimes they do double trade-in value, and sometimes they do both discount and trade-in. We shall see.
They seem to stop working occasionally. 
One of my BHK 600’s had to go back to the shop many moons ago, it would go into protect mode.
A bias adjustment was made and all was good.
Same thing happened to the other unit at a later time but on return had other issues related to getting bounced around by FedEx.
PSA expedited the repair and went so far as to replace the unit in question, though the unit was performing flawlessly after factory service. Can’t beat that.
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Sent a support request to Grimm, here’s their response:
Hello Mark,
Thank you for reaching out and sharing your experience with the MU2. I understand it can be frustrating that the MU2 does not natively decode DSD512, so I’d like to explain why this is the case.
The MU2 does not support DSD512. From the manual: “The MU2 can play all file formats that Roon supports, such as wav and flac, and has native support of PCM formats up to 8x the base rate (8FS or “DXD”) and of DSD formats up to DSD256”
The indication in Roon is accurate: “I went into the Roon settings Device setup - Max sample rate (DSD) and it only shows 64, 128 or 256 - no 512 option.” this means that 512 is not supported.
The MU2 supports up to DSD256, which is a deliberate choice based on both technical and musical considerations:
Technical Limitations:
Our audio clocks operate at a precision frequency of 512FS. To process audio signals correctly, the clock frequency needs to be at least twice the sample rate of the signal. For DSD512, this is not feasible with the current architecture of our MU devices.
Musical Considerations:
While higher sample rates like DSD512 can seem impressive, we believe they offer little practical benefit. Audio quality is primarily determined by the source recording and mastering. DSD256 provides an excellent balance between audiophile performance and technical feasibility, aligning perfectly with the philosophy behind our products.
I hope this provides clarity on why DSD512 is not supported on the MU2. I am unsure why it does play for a few seconds. If you have any further questions or if there’s anything else we can assist you with, please don’t hesitate to let us know!
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Clears things up, nice Server/Streamer DAC BTW.
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Hi! I went to the Muse section in Roon where there are custom oversampling settings and set the reduction from 512 to 256 and forgot about this problem. Otherwise, the sound of MU2 continues to please with its plasticity and musicality.