I've owned a Mod 3 and two different ARC preamps, tho neither was an SP-11. IMO, they fall at opposite ends of the spectrum. ARC gear can get a satisfying 3d presentation, but never gets tubey in a dark or romantic sounding way. Tonality stays neutral enough to feel very much like the best solid state gear.
My AI Mod 3 was darker, thicker thru the bass and lower mids, and all together a tubier sounding piece. It was definitely less neutral. I liked both, but the AI was IMO more personal taste/system defendant. I'd think that most folks would have no problem choosing one or the other.
My AI Mod 3 was darker, thicker thru the bass and lower mids, and all together a tubier sounding piece. It was definitely less neutral. I liked both, but the AI was IMO more personal taste/system defendant. I'd think that most folks would have no problem choosing one or the other.