Throughout his evaluation, reviewer Chris Baillie highlighted the Caspian 4G's ability to deliver a "pleasant, smooth, full-bodied sound with a wide soundstage", describing it as an amplifier that is both "entertaining and involving". He was particularly impressed by its ability to drive demanding loudspeakers with ease, noting that the amplifier had "no trouble" controlling his reference system.

Summing up the experience, Baillie described the Caspian 4G as offering an "easy-going yet full-bodied, dynamic sound" and a "big, spacious, full-bodied presentation, with plenty of detail and a fair dose of musicality, but with refinement too." He also praised the built-in phono stage, calling it "clearly no afterthought", and commended the BluOS streaming platform for its intuitive day-to-day operation. In his conclusion, Baillie stated, "There's certainly a lot to love about the Roksan Caspian 4G pre/power amps."

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