New Delos cart

I've owned a Delos for over a year. I can't disagree more with Pani. There is definitely a break in period, 100 hours per Mofimadness is about right. You can always start the break in period with the tail slightly down to help smooth it out somewhat. But once broken in, you will never regret the purchase. Detail, accurate just as Theo described.

It's very sensitive to VTF. Catch the right spot. Load it with maximum of 1000 Ohms, but bests between 100 and 200.

Let me clarify, I like the Lyra cartridges for its strengths which is basically speed and dynamics. I also like the Delos a lot. I have heard fully broken in Delos making glorifying music, however that little treble thing just remains and it shows its head on some recordings in a very clear way, not always. A well recorded Analogue Productions LP will not bring out this issue.

I compared the Delos with a lot of cartridges, I seriously think it is one of the best out there you can buy. Independent from Price.
BUT:
I will show you exactly what is going on with the connected units. I think, when you are disturbed from a frequency area, the problem is somewhere else. Based on its Price you will see it mainly in low quality Systems and the reactions from these owners are the way they can hear it with those units. Listen to it with a real top Turntable/Arm and Frontend and you will scratch your head in amazement.
For low quality Systems the Kleos is a better match based on its limited Frequency area.

I have a Delos. I do not hear a rising high end at all. It sounds completely neutral in that regard. It is loaded at 183 ohms into a lundahl 1941. And why would you say that it sounds fine on good Analogue Production records but wrong elsewhere? I find it hard to believe that the vast majority of recordings have a rising top end, or conversely, that Analogue Production records are all rolled off in the highs.

Maybe your hearing in the higher frequencies is better than mine?

FWIW, I also do not find the Delos to be lean and/or analytical in my system. I keep reading that this is the Lyra house sound. But it does not apply to the Delos. Each recording sounds distinctive - as they should. The Delos reveals the positive and negative attributes of recordings so clearly that I have no doubt that I am hearing a good chunk of what was captured. Great performances with solid engineering are magnificent to listen to - and there are thankfully many such records to choose from.