I was thinking about the 2300. I had one for years. Aside from having enough power to drive anything, it was beautifully voiced. If I remember right, it has a damping factor of 13! So the bass on this amp has a tube/valve like character to it. Large amps usually lose something with sonic character, not this one. It’s the one to have when looking at the 2300, 2500 and 2600 series. It also doesn’t have an autoformer. A close second is the Sansui BA-5000.
I hope you had a chance to use this In you system as something other than a sub amp.