Bump. Great post. Feel like it may be worth picking up where this left off and asking further questions on-topic. There is surprisingly little reliable information out there for those of us who want to use our LSIIs for music other than the kinds that sound stellar through a ultra-low-watt tube amps (orchestral, ambient, some guitar music, etc.). I also plan to listen to orchestral and other musics, but feel I have different needs than many other LSII owners. I am interested in using my LSIIs to play dynamic music, as it were. House, techno, etc.
Big bass, complex transient sequences can really do a number on my LSIIs with Hypex 252MP amplification producing 125W actual RMS (advertised as '250W'). Even at low volumes -- for me -- it can sound like they are the LSIIs are struggling to parse information cleanly and quickly; at higher volumes, the distortion can cause a little bit of an earache over time. I'm planning on adding a sub to lighten the LSIIs' load, but even when I do a low-cut (~80hz) through my dbx 234xs and just let the LSIIs breathe, 125W RMS is just not enough for my pleasure, personally, let alone when I'm throwing a party at my house!
I am close to pulling the trigger on a Purifi 1ETA400A in stereo, and hoping to run that to the 'low' terminal on the LSIIs while reserving the 'high' terminals for the stereo Hypex 252MP. My theoretical interest in this setup is built on the assumption that any much more than 325W RMS per channel of LSII is gonna be 'too much' because the LS is such a high-sensitivity speaker. Is this still true in 2021? Might I wanna look into higher-wattage amp for those inevitably high-power transients? Has anyone running their LSes for PA club situations found a high-wattage amp that they thought worked well with it? What have others' experiences with NON-JubScala high-wattage setups been (Klipschorn or LS)?
I know that Dave Mancuso, for example, ran his Klipschorn system on low-ish watt amp (100W RMS / channel, I believe?). Alas, unlike him I don't have 6 Klipschorn to make good sound out of, nor the budget.