XP-27 Review in September 2024 Stereophile magazine

Pass Labs XP-2, by Wayne Colburn.jpg


Stereophile magazine has gone through some changes. Art Dudley passed. John Atkinson stepped out of the role of editor as Jim Austin stepped in. So when the newest issue (September 2024) arrived today, I wondered what they would say about the Pass Laboratories XP-27 phono preamplifier.
John Atkinson did the tech review and he is a long-time appreciator of the work of Wayne and Nelson. The usual mix of tech & modesty is present in the review.
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“The rectifiers are upgraded, Colburn said, “and have suppression to stop ringing and to lower EMI.” Nelson was slight more specific, noting the addition of “separate snubbed rectifier bridges for each polarity.” Nelson also mentioned CRC filters: “All this to lower noise,” both over-the-air RF and on the AC line.

(Editor Jim Austin) noticed that, despite all these changes, the noise specification is unchanged — the same as for the XP-25. (He) asked Colburn about this. “The noise differences don’t show up in the specs because they are out of the Audio Precision analyzer’s measurement range,” he responded. “I measure on a stand-alone spectrum analyzer. Having had my hearing tested, it also falls out of my ear’s range. Why it seems quieter, I don’t know.”>
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In the conclusion, Austin said, “With the XP-27 in the system, specific musicians were easy to identify, and the character of each of the three phono cartridges I used was instantly recognizable.” Of course they love the XP-27. Congrats to all.