I too want to share my experience with the Sablon AES-EBU cable. It finds itself resident between my Grimm MU1 and Mola-Mola Tambaqui combo. But first, some foundational context is in order, or my opinion would arguably be rather meaningless for you.
I’ve been chasing the audio dream for about 4 decades now. I’m seriously closing in at long last, with most of the actual progress coming in the last few years. Suffice it to say mistakes have been made. The biggest one was mistaking brightness for detail. Don’t do it! Since you’re reading this topic in this forum, I’m pretty sure you’re an audiophile and we share many things in common. That said, I’ve come to what I believe are some pretty important guidelines for the hobby.
One of the most important is that when reading reviews, forums and researching what people are saying about any audiophile product, many commenters are what I call, “uncalibrated.” You don’t know what they have heard, the conditions under which they heard it, and what the surrounding combination of equipment were. You don’t know what is, and isn’t, sonically important to them. How do they know what great sounds like, if they have never heard it (and heard it frequently). That’s uncalibrated. Add that all up, and most opinions are actually quite meaningless. Unless one can change one component being evaluated for its sonic merit at a time, you have no idea of what the component under test is contributing (or failing to contribute). So how can anything anyone writes have much credibility in your context? It occasionally can, but it’s a hard fought for and rare situation. The only hope is to read a person’s writings over time, hopefully with a few components here and there that you’ve also heard and know. Did they agree with what you thought? I know, even then, it’s is pretty weak proof statement. I say this because you should be applying this logic and critical thinking to what I’m going to say! There's nothing better hearing a component change in your system, with your ears.
I’ve pretty much stopped dissecting and evaluating bass, midrange, treble line of thinking. Music isn’t about bands of requenc ranges, really. To me it’s become a thing about emotion, nuance, timbre and truth of the musical performance. The talent of the musicians. The fabric of the music, its texture. When it’s really right, it gives me goosebumps. Frequently occurring goosebumps mean it’s really, really good. Equally indicative… can you listen for hours on end, and yet still be ticked-off and disappointed when you have to stop? If so, that’s really, really good. When a system is really at the top of the heap, the music gains an amazing direct connection with you that is simply stunning. It makes you think wow in the first measure.
I have a theory… it goes like this. When a song starts, your brain spends about 2-10 seconds analyzing it to determine what’s going on. What right and what wrong with all the timing nuances, reverberation, frequencies, etc. Brains know what’s real, what’s natural, what is simply right. A brain know when it hears things that don’t make sense or are unnatural. It’s like how do you know when you’re walking along the bars in Nashville, which bars have live music spilling out of them and which are being reproduced? Your brain just knows. Anything that assessed to be wrong, forces your brain to fix it in real time as you listen. The more wrong, the more fixing is needed. When everything is right, there’s not much to fix. When there no fixing required, you get that direct connection to the music, to the musician that makes you feel there. Your brain accepts the music, with little or no pre-processing required. You can listen for hours without any fatigue. Theres nothing bothersome and distracting you from the music. Really good systems, playing well recorded music, do this.
The other, not-so-frequently discussed reality of our hobby, is that no matter how wonderfully musical and engaging your system is, it can be brought to its knees by a poor recording. It should be a crime that so much incredible music has been handicapped by poor recordings. I know, some would say, that the music supersedes the recording, perhaps for some, but for me not so much. I wish it were different. No matter, it is what it is and there are a lot of wonderful recordings. Roon has been a godsend.
So now, with all that said, I can report with 100% certainty that the Sablon AES-EBU cable is an absolute winner, at least for the MU-1 / Tambaqui combination. It’s simply pure magic. I already had a very good AES-EBU cable, that cost a few hundred dollars less. I kind of thought I was out of my mind for taking the gamble with the Sablon. But several of the forum posters that I had qualified as being fully “calibrated” were often using Sablon cables. So, you don’t know until you know... and I went for it anyway. It turns out to be a wonderful decision. Zero regrets. Worth every single penny. The Sablon cable delivered considerable gains in nuance, musicality and that direct connection to the music that we all crave. It just makes good recordings sound "right." I’ve now had the cable for over a month. In that time, I’ve tried going back-and-forth repeatedly on a given song, and also tried listening to my old cable for several days, then the the Sablon for several days. Every time, the Sablon wins hands down. Not just different; but way better. You can tell immediately. It's not subtle.
So here's my bottom line (finally), IMHO. If you are lucky (smart?) enough to own the Grimm MU-1 and the Tambaqui, I would go out on a limb and suggest that you may have likely not heard just how good they are. That’s how good Mark’s cable really and truly is. If you have dismissed the importance of digital cables, you would do well to reconsider and try it. I was leaving performance on the table. Very, very highly recommended. You don’t know, until you know. Perhaps it’s time for a new high-water mark in your audio “calibration” journey, just as it was for me. Plus, Mark is really responsive, knowledable and a pelasure to do buisness with.