I think that the B&W speakers are the troublemaker here. Consider replacing them.
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Check out the Primaluna manual . I do not recall the exact verbage used . Something to the affect of triode actually doing well at high volumes . Something about ultalinear at low volumes has added weight . Similar to the loudness button on older receivers . Both settings for me had no difference in volume output capabilities with my equipment .
I may be incorrect but thinking that ultra linear operates much like push pull operation in tube amps.
I tend to agree with replacing the B&Ws. I'm considering the more neutral Adagio speakers from Acoustic Zen.
I really wanted to avoid selling the CM9s as I do not have the original boxes. Shipping floor standing speakers in anything other but the original boxes can be a potential problem.
Was just hoping there was an outside chance that the PrimaLuna integrated amp, with the right tubes, could tone-down the B&Ws.
The system maplegrovemusic refers to is mine. I moved up the PL chain from the dialogue one to the premium HP. Many will say not to use tubes with B&W speakers, but I have found it to be a good match. The HP is smooth and nice. You can adjust for any brightness by swapping out the two front input tubes. Even considering it in stock form, I don't think you will experience a bright sound. I love the Primaluna sound, and appreciate how easy they are for tube rolling.
I moved from dialogue one to premium HP, so it was really like three steps up the chain. I find it to be more refined overall, and obviously more power. I like that all the tubes are 12au7, so I can try different tubes in pairs and move them around to get a variety of "flavors". I'm running KT120 now, and I'm very happy with it. I picked it for the higher power, plus I got a terrific deal on it. Otherwise I may have gone with the premium. But I didn't want to wonder what if.
It it was a good step up, with better electronics throughout. I would suggest compare the premium to the HP and pick what suits you and your speakers.