Disappointment with Pass Labs - I'm looking for something else

I think that you may find Luxman too warm and lacking that last bit in detail, from what you say about your Pass.  Vitus amps may be good for you, if they are available in your country.  They overcome some of the negatives you describe in the Pass Amps, and they do this without ever sounding too 'dry' and over-analytical in a way the De Agostini can sometimes do.   The SIA-025 integrated is Class A and sound excellent, but if this is over your budget the Reference range has an very good integrated and a pre/power option.  

I gravitate to this Board because it is active and I like the graphics/format. But there is so much utter crap to be had!!! You can not and should not listen to people's recommendations as they only recommend what they have. Does homer-ism translate? The pursuit of home audio music reproduction is a singular journey of trial and error. There are no short cuts to be had. I don't blame you for asking as the pursuit is frustrating and it is human nature to look for the quick solution. There are lots of great products but only you can decide what suits you. You obviously think it is your preamp and amp. Could be. But what if is your loudspeaker placement? What if it is your choice of interconnects? Maybe your choice of speaker cable? Maybe your power supply? Maybe your personal taste? My point is that there are way too many variables for answers on this Board and yet you will get tons of homer-istic bullcrap responses. They are well-intended but crap nonetheless. Your scenario and described shortcomings are just too broad. My advice-do not shop for components based on what you read here or any other audio board. Find a retailer who you can trust. Listen to other people's systems. Buy Jim Smith's book. Now all this said, there are those who think one should start with choice of loudspeaker and those who think one should start with the front end or preamp. None are wrong. Your choice of loudspeaker, the Cornwalls are somewhat on the spectrum meaning that they do not fall within the median range of design or characteristics, Have you ever heard them suit you in any other system? If you bought them "blind", I suspect they are part of your dissatisfaction. But that is a blind guess, like I said. 

Creo que puede encontrar Luxman demasiado cálido y falto de ese último detalle, por lo que dice sobre su Pase. Los amplificadores Vitus pueden ser buenos para usted, si están disponibles en su país. Superan algunos de los aspectos negativos que describe en los Pass Amps, y lo hacen sin sonar nunca demasiado "secos" y demasiado analíticos, como lo hace De Agostini a veces. El SIA-025 integrado es de Clase A y suena excelente, pero si está por encima de su presupuesto, la gama Reference tiene una muy buena opción integrada y pre / power.

excellent answer. I'll keep it in mind

That's why we have an game because very seldom does one amp fits all. I wanted a Krell amp really bad but when I called Krell they said they would love to sell me one of their amps but with my horn-loaded speakers, it would be the kiss of death.

Likely speaker-amp mismatch. If you intend to upgrade the Klipsch Cornwall to another speaker, then focus on the speaker first and not the amp. If you want to retain the Pass Labs, then find a speaker which you like that sounds great with the Pass.