@mezzguy2 I recently heard the Graham LS5/5 at Philip O’Hanlon’s house a few weeks ago. We spent a number of hours with the speaker, and I was able to get acquainted with the sonic presentation of the speaker and the electronics. More recently, I was also sent a pair of LS5/9 to demo for others, and I took the opportunity to get to know the Graham brand more.
Given my experience with both Graham and LTA, I would think they are not a good match. It’s not about the power rating, but simply just how the two are voiced together. The LTA is as linear as can be, with a light amount of tube harmonics. Grahams were designed from a foundation of being British studio monitors. The electronics of the day in the UK were a bit warmer, more harmonic, potentially less transparent. The Grahams on the other hand are very revealing, and quite dynamic that they will show any shortcoming of synergy through the chain.
You will be better off pairing the LS5/5 first and foremost with an amplifier that delivers with richer harmonics and is more refined in presentation. High current will also will wake the speaker up (it doesn’t take that much, but helps to in tandem deliver the harmonics and the control and slam).
I do have a strong recommendation, but as a dealer, I’ll refrain from listing it out on the thread. If you want to discuss more, feel free to message me direct. Otherwise, I think I’ve otherwise given you some considerations on amplifier types to pair with the LS5/5.
Happy New Year!