Koetsu Blue Lace Onyx vs. Coralstone

Thank you Syntax for your valuable opinion.

It is possible that I have auditioned Koetsu cartridges with not perfect setup as I was never impressed as much as you.

I have auditioned Koetsu at TW Raven AC and Black Night with SME V and Graham Phantom II and results were medicore to good and with DaVinci Virtu on the same table and results were goog to good plus.

I have also on havd Origin Live Enterprise C 12" tonearm that seems to be the heaviest one with stable dual pivot bearing but not tried Koetsu with them.

For my Koetsu has their own stron points like texture, bloom impresion of reall events at listening places, but at the same time I feel that leading edges are a bit rounded, attack not fast enougs and overall presentation a bit not neutral (house sound).

I wish I will find a good setup for Koetsu as it has nice lone life span, nice blasck background and low noise. Niece cart to own. Hovewer I am a person with only one cart installed and need something more universal.

It is possible that I have auditioned Koetsu cartridges with not perfect setup ...

Indeed, that is really difficult based on the body which hides the view. You need an alignment System with a dimple that you know when it is done correctly. I have such alignment and even with that one I needed some time ...
Anyway, all I can say, these 2 Koetsus are so different to all other Koetsus I ever listened to that I think, that the Designer made probably some changes and did not communicate that. They are also VERY powerful in their gain, rated with 0.3mV, but I use much lower gain in my preamp than I do usually with carts of such output. Both they have a tremendous punch in the reproduction without any softness.

Thank for your opinion.
I also use Acustical Systems Uni Protractor with USB scope and cart even more dificuld to align than Koetsu.

Diamond cantilever - yes, I think it is most definitely worth it. For those interested in the basis of my opinion, I am using the DC rosewood body with
- trans-fi air bearing tonearm, heroically regulated air supply
- NAS Mentor, machined Al / plywood plinth, new Wave Mechanic and motor
- Sowter transformers with nude Vishay loading resistors
- homebrew cost-no-object electronics
- multiple new generation Quad ESL's with reworked high cost electronics
- 80 KHz ultrasonic record cleaner

I was advised that the DC would harden the sound. I can't comment on a standard KRSP, but the DC makes the music uniquely smooth and elegant. My taste in music is "classical", by which I mean serious music, especially from the Renaissance. Polyphony is especially hard to get right - my system does it, and the DC is an important element thereof. The main difference between my system and live (acoustic) performance is slightly inferior leading and trailing edges - and that is the current research topic (turntable).

DC Fragility? Perhaps, but I have not, as yet, had an issue with that. Just make sure that if you use a coin as a standard weight for your stylus gauge, you use a silver coin, not one of the modern steel ones, as the platinum magnet is unexpectedly strong.

Update

DIY air bearing turntable with 45kg platter makes the Koetsu still better. Clarity without the edge, detail without noise.

Trans-Fi tonearm is weighted with brass weights and deadened with damping material.

And the silver Lundahl transformers don't hurt either.