Canpur CP622B VS Fir Audio RN6

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Canpur CP622B is positioned as a true apex set among today’s ultra-high-end IEMs—think Storm, Grand Maestro, Pearl, Multiverse, RN6—where differences are subtle and taste-dependent, not about basic quality. The message is simple: once at the Money Trees level, most flagships are excellent; the CP622B stands out by pushing resolution and authenticity to the top of that pile while keeping music the focus.

Evaluation leans on a tight suite of reference cues: bass definition via Black Sabbath “Sweet Leaf” (2:36–3:10), midrange texture with Soundgarden “Spoonman” (spoons/vocals) and Neil Young “The Needle and the Damage Done,” and treble control from Aerosmith “No More No More” (recurring cymbal strikes). Micro-details and spatial tells include Michael Jackson’s beep, Violent Femmes finger snaps, the crowd-side triangulation in Lynyrd Skynyrd’s “Freebird,” Pink Floyd’s gate announcement in “On the Run,” Randy Rhoads’ finger slide in “Dee,” and the famous cough in “Wish You Were Here.” These checkpoints spotlight the CP622B’s clarity, attack/decay, and rare sense of depth for an in-ear.

Two practical notes seal it: level-matched A/B at 77 dB @ 440 Hz versus Subtonic Storm to ensure fair comparison, and a low-frequency test around ~42 Hz that makes the shells physically vibrate, delivering that body-felt slam prized in hip-hop and recognized in orchestral power. With a library spanning ACDC, Alice in Chains, Bob Marley, Dre, Kendrick, Metallica, Pink Floyd and more, CP622B reads as a top-tier all-rounder—immense detail at low volumes, potentially intense when cranked, and an easy recommendation for those chasing the very best.

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Fir Audio RN6 brings a six-driver recipe and a limited-edition flair to the tour, dressed in satin black aluminum with a sapphire-glass faceplate and that signature grill exposing the Kinetic Bass dynamic. The stock cable behaves like a less-stiff Code 23, build feels solid and low-profile, and comfort clicks once the right tips are locked in. Priced at an eye-watering $3,300 and capped at 300 units, the RN6 aims squarely at “Stratos-Fi” territory.

On tuning, the RN6 plays it balanced: bass has punch and some rumble but is the tamest of its siblings, not delivering the full “feel-it” effect promised by Kinetic Bass—especially versus NE4 and the poster-child XE6. The midrange is clean with a touch of warmth, pushing vocals center stage while keeping instruments neatly spaced with plenty of air. Treble is energetic, sparkly, and crisp, lifting detail and openness, but may bite for treble-sensitive listeners given the lighter low-end masking. Technical chops are where it shines—imaging, layering, and a spherical sense of stage width/depth make parts easy to pinpoint without turning clinical; it’s revealing yet still musical. Versus Neon 4, this is the more detail-forward, vocal/treble-emphasized choice, though a little extra sub-bass weight would sweeten the deal. It’s trivially easy to drive. As a package, RN6 sits a step above Neon 4 on presentation and refinement, but the “gotta-have-it” factor isn’t unassailable at this price, with alternatives offering similar flavor at lower tiers. Still, for those craving a clean, airy, vocal-focused flagship with strong technicalities, this is a compelling—if costly—ticket.

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Canpur CP622B makes a striking first impression with a premium case, tidy accessories, and a shimmering faceplate—but the shell is huge, bordering on chunky, and can push fit comfort limits over longer sessions. Sonically, it hits with authoritative sub-bass and impressive extension, yet the overall presentation skews dark; vocals sit a touch recessed, with a wish for more 1.5–3 kHz presence and a bit more upper-air sparkle. Out of the box it already thumps, but a light EQ lift to upper mids and bass can coax out more vibration and energy.

On graphs and in A/Bs, the CP622B comes off as a specialist: fantastic low-end texture (bass judged around 9.5 for level), solid resolution and stage, but imaging feels slightly constrained by the muted 3 kHz region. Compared with peers, FATfreq Grand Maestro reads like the safer “one-and-done” all-rounder with more flair up top; Aful Cantor delivers comparable presence at a fraction of the cost; Hisenior Mega5-EST Bass offers a friendlier fit and a tuning that can feel just a hair more balanced; and as a personal north star, Elysian Annihilator 2023 still sets the bar for extension and excitement. Net: a fantastically built, bass-thrilling CP622B that shines with hip-hop/R&B and cinematic lows, but reads as niche and pricey—a connoisseur’s piece for big collections rather than a first-pick endgame.