I think many here will agree even some of the best AV preamps will not compare in sound quality to a really good two channel preamp.
How Will A Quality Preamp Help
I currently run my ARC Ref 2SE phono output via balanced connectors into my Yamaha AX-5000 preamp fed from a Krell 1500S amplifier (300W @ 4 ohms). For analog inputs, the AX-5000 has a pure direct mode with least circuitry to minimize noise (recommended for pure hi-fidelity sound). The AX-5000 is really a multi-channel (11) processor. Since I am moving towards two channels, I am debating whether I should just get an integrated (SS) amp or just upgrade my amp and pre-amp. I was thinking about doing the pre-amp first and was wondering if I bought a quality preamp (something like a ML 326S) - would my sound improve?