Country of Origin

USA

XP-22

Reviewer: Dawid Grzyb & Srajan Ebaen
Financial interests: click here
Main system: Sources: Retina 5K 27" iMac (4GHz quad-core with Turbo, 32GB RAM, 3TB FusionDrive, OSX Yosemite. iTunes 14.4), PureMusic 3.02, Audirvana 3, Qobuz, Tidal, Denafrips Terminator+ clock-synced to Soundaware D300Ref SD transport/USB reclocker; Preamp: Vinnie Rossi L2 Signature with WE VT52/300B or Elrog 50/300B; Power amps: LinnenberG Liszt monos; Headamps: Questyle CMA-800r monos; Phones: HifiMan Susvara; Loudspeakers: Audio Physic Codex; Cube Audio Nenuphar; Aurai Audio M1 [on loan]; Cables: Complete loom of Allnic Audio ZL; Power delivery: Vibex Granada/Alhambra on all source components, Vibex One 11R on amps, LessLoss C-MARC Entropic cords between wall and conditioners; Equipment rack: Artesanía Audio Exoteryc double-wide 3-tier with optional glass shelves, Exoteryc Krion and glass amp stands; Sundry accessories: Acoustic System resonators, LessLoss Firewall for loudspeakers, Furutech NCF Signal Boosters; Room: 4 x 6m with high gabled beam ceiling opening into 4 x 8m kitchen and 5 x 8m living room so no wall behind the listening chairs
2nd system: Source: Soundaware D100Pro SD transport; DAC/pre: Denafrips Terminator or COS Engineering D1; Amplifier: Bakoon AMP-13R or Crayon CFA-1.2; Loudspeakers: Acelec Model 1 w. Franck Tchang magnesium super tweeters, sound|kaos Vox 3awf, Zu Submission subwoofer; Power delivery: Furutech GTO 2D NCF; Equipment rack: Hifistay Mythology Transform X-Frame [on extended loan];  Sundry accessories: Audioquest Fog Lifters; Furutech NFC Clear Lines; Room: ~4x6m
Desktop system: Source: HP Z230 work station Win7/64; USB bridge: Audiobyte Hydra X+; Headamp: Kinki Studio Vision THR-1; Phones: Audeze LCD-XC on Forza Audio Lab cable; Powered speakers: Fram Audio Midi 120
Upstairs headfi system: Source: Soundaware A280 SD transport; Integrated amplifiers: Schiit Jotunheim R or Bakoon AMP-13R; Phones: Raal-Requisite SR1a, Audeze LCD-2, Final Sonorous X & D8000, HifiMan HE-1000
2-channel video system: 
Source: Oppo BDP-105; DAC: Kinki Studio; Preamp: Wyred4Sound STP-SE II; Power amp: Pass Labs XA-30.8; Loudspeakers: German Physiks HRS-120; Room: ~6x4m

Review component retail: $9'500

Vudu Juan oh Juan? From Carlos Castaneda's primary sorcery instructor Don Juan to the latest in quantum mechanics, inexplicables abound. Those could make for a new Stallone franchise once The Expendables are killed off? For The Inexplicables, they'd not hire anyone from Pass Labs though. There calm Engineering 101 not voodoo or built-in obsolescence are the rule. Should inexplicables arise, they're sorted until everything works. Longevity from reliability is key. Expendables are shipped out to Hollywood elsewhere in the state. That's apparent in no-nonsense cosmetics, thick metal chassis, external power supplies to increase their footprint and categorical absence of iGen frills. In fact, the iGeneration won't know what to do with a full tape loop though balance control and trigger port ought to be obvious. It's also why today's two-chassis XP-22 linestage from in-house low-level expert Wayne Colburn has an infrared remote, not a tablet app. It's why the power umbilical gets 12-pole "aviation-grade" twist locks, not wobbly 2.1mm plugs of switching wall warts. In fact, the only thing that switches is the on/off rocker. Not even the new-old stock Toshiba A1837/C4793 Jfets in the patented Super-Symmetrical topology or current-buffer Mosfets biased via opto-coupled LED-stabilized transistor are allowed to. No class D at Pass Labs. Class AB is fine, class A preferred. That's what the XP-22 embraces; that and a dual-mono power supply with tall twin toroids and 4 x 10'000µF/50V caps per channel. So forget Bluetooth, touch screens or DSP-based tone controls.

Voltage gain is a low ~9/6dB XLR/RCA since modern amps rarely ever exceed the unity gain of modern sources. Input Ω is a standard 22k, Z-out 25/50Ω on RCA/XLR. The power supply is true dual mono, the single-ended output stage overbuilt to drive even long cables. At 40lbs, this is no lightweight needle drop on a scale and "measuring spectacularly well" is promised and confirmed by Stereophile. There are 99 steps for the single-stage but dual-mono volume control which repurposes from the $16'500 XP-30 and displays in big blue numbers. Frequency response is claimed to hold to within ±0.05dB of ruler flat. Input 5 may be configured for home-theater bypass to offline the volume control. And that's essentially it. Why should a preamp be more complicated? To rephrase, the XP-22 is for listeners who find that quality active preamps improve the sound and properly condition the signal despite being theoretically redundant with variable sources that perform digital on-chip attenuation. It's also a purist analog single-purpose machine so no digital, headfi or phono. For the latter two, Pass Labs have dedicated kit. And if your wallet just had to know, they still have two preamplifier models above today's. The next one spreads across three chassis, the flagship runs over 100'000µf of capacitance per channel and weighs 80lbs. What do those buy extra? Incremental refinements. As they ought to, they pursue ever lower noise to shave off more signal-to-noise points and add those to dynamic range. And they probably run still more current for even lower transmission loss.

When's good enough good enough? I don't know about you but today, it'll be the XP-22. For the majority of our readers—and this writer!—a nearly $10K two-box preamp should be plenty posh already. That included Stereophile who awarded this machine their Amplification Component of 2019. By living in the hinterlands of Ireland's rural west coast where the lost sheep roam, it simply took us a while to catch up. All good things to those who wait?

… to be continued…