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.
Don’t know where to find the Muse section in Roon.
It’s not a problem on my MU2, it’s that the MU2 does not natively decode DSD512.
PS Audio/Octave records graciously let me re-download the album at 256 and everything’s fine.
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Glad you resolved your issue. If this ever becomes an issue again, Roon is pretty intuitive. Click on the volume icon at the bottom right of the screen, click on the squiggly line (this takes you to Muse), go to sample rate conversion, and find the sample rate you want to change. Cheers.
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I was very close to buying a MU2 but was torn about giving up the DS MKII which I would have to do in order to justify the expense. To those of you that have kept their MKII, now that Blue Sky has been released do you think an MU1 might be a better approach?
I do want to upgrade my Roon server, (an older Antipodes), but I am very happy with my Aesthetix Calypso Signature. I would have to sell the MKII, Calypso, Antipodes, and Sonore Optical Rendu to swing the MU2.
Are you now using the DAC in the MU2 or using the MKII Blue Sky?
Thanks
No, MU1 is a streamer, but NOT a dac.
MU2 is a streamer and a dac, and a preamp if you so choose, though I prefer a separate preamp.
If I didn’t already have an MU2, I would be tempted to buy, ok, I would buy, an MKII right now.
Edit: But I am also extremely happy with the MU2, and might never get rid of it, unless an MU3 comes along, and completely blows away the MU2, and is half the cost, lol.
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from what I know MU2 Adds preamp and nice DAC and can do DSD.
Are you keeping Pre? Do you need DSD? if not maybe the MU1 will work.
Of course I do not own either but just what I have read.
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Sorry I was not clear, yes I am considering keeping the MKII as my DAC, the Calypso as my preamp, but replacing the Antipodes and Optical Rendu with an MU1.
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Look into what @brian.fitterman said.
In addition to using the MU2 as a streamer and a DAC, I also play music from DSD256 files from a usb flash drive inserted in the usb slot on the back of the MU2.
If DSD256 is something you might get into, you might want to research how to get DSD256 to the MKII and what products will work.
I kept MK2 after I bought MU2, and it was a great decision as it turned out. The reason of keeping MK2 was because I have a large collection of SACD (around 400 and growing). So, MK2/PST plays an important role in my particular case.
PST/MK2 going through MU2’s pre has been a major improvement over my previous pre. MU2’s pre sounds much clearer and cleaner, and at the same time is more musical too.
This was before the Bluesky update. Now the SQ from SACD has exceeded my previous favorite DSD256. Not only that, but even regular CDs also sound better than DSD256! Ted did an incredible job on the latest update.
Too bad MU2 does not have a digital output so I can compare its DAC to MK2. But I believe MK2 now can compete with many DACs that were in the much higher level before.
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Having heard your MU2 you did right. A fine step up from the DSD Mk2.
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Thanks for the replies. DSD Mk2 will stay even though I have not been able listen to Blue Sky yet. From the reviews so far it must be quite an improvement on an already excellent DAC.
I’m sure Grimm will update their FPGA over time but I have long been impressed with what Ted has done and I am very comfortable sticking with his engineering.
That has made my decision to upgrade the Roon server and streamer but stick with the DSD Mk2 and Calypso much easier.
Thanks all.
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Yes, the MU2 is fantastic!!
The PZ is also fantastic!!
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