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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-29 · 6 min read · Independent comparison
• Austrian Audio Hi-X55 — biggest strength: A 44 mm High Excursion dynamic driver with 25 ohm impedance and a 5 Hz–28 kHz frequency range, built for precise, detailed monitoring in the studio or on the move.
• Austrian Audio Hi-X55 — biggest trade-off: It's fully wired with a 3 m cable. No Bluetooth, no noise cancelling — just passive isolation from the closed, double-walled ear cups.
• Amazon Renewed Bose QuietComfort 45 — biggest strength: Active Noise Cancellation with Quiet and Aware modes, Bluetooth 5.1 wireless, and up to 24 hours of battery life per charge.
• Amazon Renewed Bose QuietComfort 45 — biggest trade-off: It's a renewed unit, not new — professionally inspected and backed by a 90-day limited warranty, but you're buying a pre-owned product.
• Who each is for: The Hi-X55 is for producers, engineers and critical listeners who work wired. The QuietComfort 45 is for commuters, travelers and remote workers who want silence and no cables.
The Hi-X55 is a closed, circumaural studio headphone built around a 44 mm dynamic driver. Austrian Audio's "High Excursion" design uses a ring magnet system and a copper-coated aluminium voice coil to cut the weight of the moving parts — the idea being that lighter, faster-moving components reproduce transients more cleanly. Whether or not you buy the marketing language, the numbers tell a consistent story: 25 ohm impedance means it's easy to drive from a laptop, phone or interface without a dedicated amp, and the stated 5 Hz–28 kHz range is unusually wide at the low end.
The build is the part I keep coming back to. Hinges and headband are all metal, and the whole thing folds. Slow-retention ear pads are designed to hold their shape over long sessions rather than flattening out after a few months. For someone who mixes, tracks, or just listens critically for hours at a time, that combination — metal frame, replaceable cable, comfortable pads — is what actually determines whether you still like a headphone two years in.
Buy it if you work with audio, want a wired connection you can trust, or need passive isolation for tracking without a signal bleeding into a mic. Skip it if you want to walk around untethered, take calls, or block out airplane noise — a 3 m cable and no active cancelling make it the wrong tool for those jobs. Note the box lists a 3.5 mm removable cable with a 6.3 mm adapter, and the product data also references a 6.35 mm jack, so plan your source connection accordingly.
The QuietComfort 45 is the opposite philosophy. It's wireless only — Bluetooth 5.1, roughly 30 feet of range, no headphone jack at all. Bose's approach to noise cancelling uses tiny microphones to measure outside noise and cancel it with opposite signals, and the QC45 gives you two modes: Quiet for full cancellation, Aware to let the world back in without taking the headphones off. That Aware mode is genuinely useful — hearing a gate announcement or a coworker without pulling an ear cup off your head.
Audio-wise, it uses TriPort acoustic architecture with volume-optimized Active EQ, which keeps bass consistent as you change volume, plus an app-based adjustable EQ for bass, mid and treble. Battery life is the headline: about 24 hours of average use, with a 24-hour charge time. That's a full workweek of commutes on a single charge for most people.
The catch is the "Renewed" part. This isn't a new pair — it's a pre-owned or refurbished unit that Amazon-qualified suppliers have inspected and tested to work and look like new. You get a 90-day limited warranty and eligibility for replacement or refund under the Amazon Renewed Guarantee. That's a real safety net, but it's shorter than a new-product warranty, and you should understand you're buying a returned or traded-in product rather than a sealed box.
Buy it if you commute, fly, or work in a noisy space and want wireless freedom plus serious noise cancelling. Skip it if you need a wired connection, want a brand-new unit with a full manufacturer warranty, or prefer the neutrality of a studio monitor over Bose's consumer tuning.
• Best for audio work and mixing → Austrian Audio Hi-X55. A 25 ohm, 44 mm driver with a 5 Hz–28 kHz range is aimed squarely at critical listening.
• Best for noise cancelling → Amazon Renewed Bose QuietComfort 45. Active Noise Cancellation with Quiet and Aware modes beats passive isolation for blocking engines, HVAC and chatter.
• Best for battery life and wireless use → Amazon Renewed Bose QuietComfort 45. Up to 24 hours per charge and Bluetooth 5.1 with 30 ft range.
• Best for durability and repairability → Austrian Audio Hi-X55. All-metal hinges and headband, foldable, with a removable cable — the parts that usually break first are the parts that are serviceable.
• Best for long-session comfort → a tie, by design. Hi-X55 uses slow-retention ear pads; QC45 uses around-ear nylon construction. Both are built for hours, just for different postures.
• Best for travel and commuting → Amazon Renewed Bose QuietComfort 45. Wireless, cancelling, and a protective case included.
• Best for a wired, latency-free connection → Austrian Audio Hi-X55. No Bluetooth codec, no pairing, no charging — plug in and it works.
• Best "new vs renewed" peace of mind → Austrian Audio Hi-X55. The QC45 is renewed with a 90-day limited warranty; the Hi-X55 is sold as a new product.
In my opinion, the Hi-X55 wins on build and long-term ownership. All-metal hinges, a foldable frame, replaceable pads and a removable cable mean the parts most likely to fail can be fixed — and a wired 25 ohm driver with a 5 Hz–28 kHz range is simply the more honest tool for anyone doing audio work. That said, if your daily reality is a noisy train, a shared office or a long flight, I'd take the QuietComfort 45. Its active cancelling, Aware mode and 24-hour battery solve problems the Hi-X55 doesn't even try to solve. Buy the Hi-X55 for the desk; buy the renewed QC45 for the commute.
For studio and mixing work, yes — in my opinion. The Hi-X55 is a wired closed-back monitor with a 25 ohm, 44 mm driver, a 5 Hz–28 kHz range and a removable cable. The QC45 is tuned for wireless listening and noise cancelling, not reference monitoring.
Does the renewed Bose QuietComfort 45 have a warranty?
Yes. Amazon Renewed products carry a 90-day limited warranty, and renewed items are eligible for replacement or refund under the Amazon Renewed Guarantee. It's a shorter window than a new-product warranty, so factor that into your decision.
No. The data sheet lists no headphone jack — connectivity is Bluetooth 5.1 wireless only, with a USB Type-C cable included for charging. The Hi-X55, by contrast, is wired via a 3.5 mm cable with a 6.3 mm adapter.
Honestly, they serve different jobs. In my opinion, the Hi-X55 is the better choice for production, and the QC45 is the better choice for the commute. If you can only pick one and most of your listening happens in noisy places, the QC45's active cancelling will matter more day to day.
If price is the deciding factor for you, check the current price on Amazon for both before you commit — the two live in different worlds, and the gap matters.
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