It's tough to assess my own reaction, because I took my Modwright Oppo 105 out of my system to sell it and have been using my Modwright Oppo 95, which has a warm, meaty signature to it. It seems I'm going from one end of the spectrum to the other. The 105 did not have perfect tonal balance, but was much closer than the uR/LKS combo right now. I still don't have 150 hours on the LKS and less than 100 on the ultraRendu.
I tremendously enjoyed the Modwright efforts. However, despite trying several tube-based products over the years I have found I simply have a bias against them. The details of that aren't important, and I know I'm being close-minded despite a very positive experience with tubes in my last four CD players, but it is what it is. I don't want tubes in my system (for now). What I do want is ruthless accuracy and detail, tonal balance, and a huge soundstage in all dimensions if the recording supports it.
I believe Dan Wright of Modwright only modifies the analog output on CDPs, so I believe I was listening to the stock digital output via SPDIF on the Oppo. I've noticed that the Oppo 103 in my home theater lacked mid-bass when I tried it in my stereo a couple years ago, so the lack of mid-bass with the Modwright Oppo 95 did not surprise me. I did not expect this to be a problem with the uR, as I thought this was merely a shortcoming in the two-channel performance of the Oppo, but I hear the same thing with the uR. I'm also getting less punch on the very bottom, vocals stand WAY out from the rest of the music, and certain other frequencies stand out as well. I'll have to make notes next time I listen to explain what they are. Usually I can solve the vocals by toeing my speakers out, but I'm not sure that would work, and if it did work, I suspect it would cause other issues.
Here's an interesting phenomenon I've never experienced before: I always feel compelled to turn the volume up. However, once I turn the volume up to where that compulsion diminishes my ears start bleeding from the brightness. I don't know what to make of it, but I'm interested to hear others' experiences with this phenomenon, what causes it, and how they solved it. I'm confident this is somewhat common with all kinds of gear.
I'll look in to the firmware issue. If Small Green Computer shipped me an ultraRendu without the latest firmware, though, I'm gonna be a tad grumpy. :|
Finally, I've seen few posts about which filter and DPLL setting folks are settling on for either PCM or DSD playback. I'd appreciate seeing what others like. I've listened extensively to BW01, 07, and 12. I like 07 the best, I think, and if I can get the brightness and lack of tonal balance solved I think this will be the right balance of the BW offerings for me. I hear less difference in the filters than the bandwidth, but I think that will change as I get the other things dialed in. I've only played about 30 minutes of upsampled music to DSD, so I haven't really had a chance to listen to the different DSD filters yet.
Ah, I missed your question about playing directly from a computer. Unfortunately, both my laptops were bricked during failed Win10 updates, and I don't know how to unbrick them without losing everything on the hard drive, so I'm unable to try a laptop to the LKS. I could use my wife's old computer and run SPDIF out from the motherboard, but that will be an evening's endeavor, so I'll try that as a last resort.
Thanks again for your thoughts and advice!