Like you, I have the Accuphase a48s and the c2300. I initially tried the McIntosh c53 preamp instead of the c2300. The c2300 has truly opened up the a48s to its full sound ability. Also like you, I have Klipsch speakers. In my case, I have the Klipsch Forte IVs. Before the switch of the preamp, I wondered if switching the speakers would have me what I wanted more so…with that being said, the c2300 as I stated REALLY opened up my system. I’d call it almost lush sounding. I am pretty sure this will be my system that I will have for years and years. I listened to some Luxman devices (I think the 509z) at a HiFi store. It just sounded more “bright” sounding. I’m didn’t like it as much as what I get from my current setup.
I cannot speak on the other Luxman devices though. I would be interested in what the Luxman tube preamps would do for my system.
For now though, like I said this is “my” system…lol.
For context….
My other devices are PS Audio PerfectWave SACD transport going through the Laiv uDAC, Eversolo DMP-A6 Master Edition Gen 2 as the streamer, Denon DP-3000NE direct drive turntable using an Ortophon black quintet, and Icon Audio PS1 MkII MM/MC phono preamplifier.