We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-24 · 7 min read · Independent comparison
If you want marathon battery life with a wired lossless fallback and a head-tracked spatial mode, choose iKF Nano; if you need stronger adaptive noise cancellation, a newer Bluetooth version and a foldable travel build, choose HAYLOU S40. Both are over-ear, both run 40mm-class drivers with LDAC on board, and both lean hard into the hi-res audio story. The split comes down to what you actually do with them.
• iKF Nano — biggest strength: Up to 140 hours of playback with ANC off (95 hours with ANC on), plus LDAC hi-res audio, 360° head-tracked spatial sound and an AUX/USB-Audio wired path for lossless listening.
• iKF Nano — biggest trade-off: Adaptive ANC is rated to block 99.8% of background noise, but the hybrid ANC depth on the HAYLOU is specified higher, and the Nano's touch-free button control scheme plus suspension headband design is more about comfort than compact travel.
• HAYLOU S40 — biggest strength: 50dB hybrid ANC that adapts to your surroundings, Bluetooth 6.0, touch control, multipoint connection and a foldable design that packs down small.
• HAYLOU S40 — biggest trade-off: 90 hours of playback is excellent in absolute terms but well short of the Nano, and its wired connection is USB-only — there is no 3.5mm jack for a plain analog cable.
• Choose iKF Nano if you want the longest runtime, head-tracked movie audio and the flexibility of both AUX-in and USB audio.
• Choose HAYLOU S40 if you want the most aggressive noise cancellation, the newest Bluetooth standard and a headset that folds flat in a bag.
The iKF Nano is built around endurance and immersion. With ANC off it's rated for up to 140 hours, and even with active noise cancellation running you're looking at up to 95 hours. That's the kind of number that matters if you charge on Sundays and forget about it for the rest of the week — long-haul flights, back-to-back workdays, a commute plus a gym session plus an evening of gaming without ever reaching for a cable.
On the audio side, the Nano uses 40mm silk composite dynamic drivers with LDAC support, which is the codec that lets a compatible phone push a much higher-bitrate stream over Bluetooth than standard SBC or AAC. It also adds 360° head-tracked spatial audio with Movie Mode 2.0 — the kind of feature that makes a film feel like it's happening around you rather than in front of you. And if you want a genuinely lossless wired path, it accepts both AUX-in over a 3.5mm jack and USB-Audio, so you're not locked into Bluetooth at all.
Comfort is clearly a design priority: breathable mesh ear cushions and a suspension headband, with a metal-and-plastic enclosure in purple. Controls are a mix of physical buttons, volume control and app-based customization through the iKF app, which also gives you a custom EQ. Bluetooth 5.4 handles the wireless side, and you can pair two devices at once and switch between them.
HAYLOU S40: Who It's For
The HAYLOU S40 leads with noise cancellation. Its 50dB hybrid ANC is specified to reduce up to 95% of ambient noise — airplane and car engines, subway rumble — and it uses adaptive ANC to automatically adjust cancellation depth based on what's around you. If you fly often or ride noisy transit, that adaptive behavior is the feature you'll notice every single day, because it means you're not manually flipping between modes as your environment changes.
The driver setup is unusual for the category: a 40mm plus 20mm titanium-plated dual-driver arrangement with adaptive sound algorithms, tuned for lossless reproduction, and it carries Hi-Res wireless audio certification with LDAC support. Frequency range is listed at 40Hz–20kHz and sensitivity at 97dB, with 32 ohm impedance. In practice, a dual-driver design like this is aimed at separating the low end from the mids and highs so busy tracks don't smear together.
Connectivity is where the S40 pulls ahead on paper: Bluetooth 6.0, multipoint connection, and 80ms low latency with spatial audio for gaming through the Haylou Sound app. That app also handles noise-cancelling depth controls, preset sound profiles, device renaming and game mode. Controls are touch-based, the build is ABS, polycarbonate and faux leather in white, and it folds — which matters if you're stuffing it into a backpack pocket. Wired listening is USB only, so there's no 3.5mm analog input. Battery is rated up to 90 hours with a 2.5-hour charge time, and the box includes a detachable microphone and a Type-C 2-in-1 cable.
Buy it if noise cancellation is your top priority, you want the latest Bluetooth version and multipoint, and you value a foldable design. Skip it if you want the longest possible battery life or a plain 3.5mm wired option.
• Best for battery life → iKF Nano. Up to 140 hours with ANC off and 95 hours with ANC on versus 90 hours on the S40.
• Best for noise cancellation → HAYLOU S40. 50dB hybrid ANC with adaptive depth adjustment, specified to cut up to 95% of ambient noise, against the Nano's 99.8% background-noise reduction claim with standard adaptive ANC.
• Best for wired flexibility → iKF Nano. It offers both 3.5mm AUX-in and USB-Audio; the S40 offers USB only.
• Best for movies and spatial audio → iKF Nano. 360° head-tracked sound with Movie Mode 2.0 is aimed squarely at film watching.
• Best for gaming and low-latency → HAYLOU S40. 80ms low latency with spatial audio via the Haylou Sound app and a dedicated game mode.
• Best for travel and packing → HAYLOU S40. The foldable frame packs smaller than the Nano's suspension-headband build.
• Best for newest connectivity → HAYLOU S40. Bluetooth 6.0 with multipoint versus Bluetooth 5.4 with dual-device pairing on the Nano.
• Best for control preference → depends on you. Buttons and app control on the Nano; touch control with app customization on the S40.
In my opinion, the HAYLOU S40 is the one I'd buy if noise cancellation is the reason I'm shopping — 50dB adaptive hybrid ANC, Bluetooth 6.0, multipoint, a foldable frame and an 80ms low-latency game mode add up to the more complete everyday headset. But the iKF Nano is the better pick if battery life and wired lossless matter most, because 140 hours and both AUX-in and USB-Audio are hard to argue with. Both run LDAC, so the hi-res question is settled either way; the real decision is noise cancelling versus runtime.
what is hi res headphones
Hi-res headphones are headphones capable of reproducing audio at a higher resolution than standard lossy Bluetooth codecs allow. In practice that means support for codecs like LDAC, which carries a much higher-bitrate stream than SBC or AAC. Both the iKF Nano and HAYLOU S40 support LDAC, and the S40 carries Hi-Res wireless audio certification.
what is hi res audio headphones
It's the same idea phrased slightly differently: headphones built to handle high-resolution audio, where the source file and the wireless codec both preserve more detail than a standard stream. The payoff is more nuance in busy tracks. The iKF Nano pairs its LDAC support with 40mm silk composite drivers, while the HAYLOU S40 uses a 40mm plus 20mm titanium-plated dual-driver setup.
what are hi res headphones
They're over-ear or in-ear headphones that support high-resolution codecs and, ideally, a wired lossless path. The iKF Nano gives you LDAC over Bluetooth plus AUX-in and USB-Audio for wired lossless listening. The HAYLOU S40 offers LDAC and USB wired audio, but no 3.5mm analog jack.
which headphones support hi res lossless
Both of these do, with a caveat. Wireless "lossless" depends on LDAC support, which both have, plus a compatible source device. For a true wired lossless chain, the iKF Nano is the more flexible option because it accepts both a 3.5mm AUX cable and USB-Audio, while the HAYLOU S40 relies on USB alone.
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