By chance I managed to get my hands on this bad boy for a bit - King Arthur LE
The difference with the original King Arthur is that it is retuned btw, no difference in hardware.
One can have a preference for tuning but I would argue that objectively, its performance is impressive. Even with an entry level copper cable its treble extension, and accordingly, high resolution and stage airiness is quite noticeable.
I personally like the tuning. It has a balanced tonality, neither warm nor bright. A coherent tuning with its foundation in the midrange. It creates large instrument notes, resulting in a forward and very engaging presentation. It's a full sound, but not a 'thick' sound as you would get from simply increasing the bass. Vocals are slightly laid-back to instruments in comparison, so I would guess the freq response dips a bit between 500 Hz to 2 khz, followed by a gradual rise between 3-4 Khz. The treble is smooth and in line with the midrange. I didn't detect any nasty peaks in the lower or upper treble.
The bass is tuned relatively neutral in favour of the midrange. It has a punchy, but controlled midbass, so it gives a nice kick down below, without warming the overall tone. Its subbass is a bit rolled off, in that regard it is somewhat similar to Zeus (Zeus in turn has more presence between 1-2 Khz). But the Caliburn cable compensates by adding a bit of low end extension and impact. It also opens the stage and gives it a more uncolored, transparent and neutral tonality, resulting in a more prototypical ‘hi-fi’ sound.
All in all, I think if you look at its technical performance in terms of resolution, transparency and soundstage quality, it is a top-class monitor – in addition to what I would consider a balanced tuning. Of course I may be biased, but it is my personal opinion as reviewer and enthusiast flinkenick for what it's worth