Re: LXs in a large room with a tube amp
The Ascend website is recommending min of 90 wpc for 15 foot distance. Any way to move your seat closer?
When I first got my LXs, I put them in my main system (run the Towers, there, original model and now ELXv2) for about a week or so. I only sit about 9' from the speakers. Room is essentially a big open concept area, as well. Using a Rogue ST100 (100 wpc in ultralinear mode - what I use, I believe around 60 wpc in triode mode. The Rogue uses 4 KT120 power tubes. No problem driving the LXs to deafening levels.
That said, I think your power estimate for the KT150's are way too low. I couldn't find a spec for them with your Primaluna, but would guess they are more than 100 wpc in ultralinear mode (appears the PL can run in either triode or ultralinear like my Rogue), assuming 4 power tubes which it looks like the PL has. You should ask your dealer (and if not Upscale Audio, you may want to ask them.)
* LG OLED65E6P, BenqHT2050A
* Anthem AVM90, Rogue ST100, VTV Pascal 7 ch
* Sierra Towers/Horizon (all ELX RAAL), S2EXv2 surrounds, HTM200SEx4 heights, Rythmik E15HPx2
* VPI Classic 1+ (VTA & Fatboy Gimbal), PE Eagle/RR, VAS NOVA, Soundsmith Paua, Manley Chinook, Bob's Devices SUT, SugarCube 1 mini
* Oppo 203 & 103D, EverSolo DMP-A6
* miniDSP Flex, Audiosensibility & Blue Jeans cables, Symposium & Isoacoustics, GIK
* For RDJ: Anthem MRX720, Sierra LX, Luna Duo v2 center, CXNv2, TBD