Audio-Technica ATH-M50xEnso vs Sennheiser HD 550

Audio-Technica ATH-M50xEnso

The Enso's headline change is purely cosmetic: an all-black finish with a single white circular 'Enso' brushstroke marking 10 years of the M50x. Underneath, it is the same plastic-and-metal closed-back build — comfortable for a couple of hours, with swivelling cups and a flimsy pouch.

• The Enso marks the 10-year anniversary of the M50x with a fresh minimalist design — an all-black finish with a styled swirling accent that honours Japanese artistry.
• Audio-Technica describes the Enso as a return to the original sophisticated all-black colourway after years of varied limited-edition designs, with the circle reflecting both that return and the iconic rings on the M50x.
• The build itself doesn't change much for the Enso — it keeps the same swivelling ear cups and the proven M50x construction.
• The mainly plastic body with metal-notched headband adjustments looks spectacular in its matte finish, with hinges that let the closed-back cups fold down for storage.
• The memory-foam pads feel stiff initially but break in with use; clamping force is secure rather than overly tight, and it fits comfortably for a couple of hours.
• The closed-back design, while excellent for isolation, can make the M50x feel a bit tight for some users, and the vinyl pads retain heat over long sessions.
• The robust design includes 90-degree swivelling ear cups for easy one-ear monitoring — a practical touch for DJs, producers and engineers.
• The included vinyl drawstring pouch mainly guards against surface scrapes — cheaper headphones often ship with better protective cases.
• Hands-on with the limited edition: the soft pleather on the headband and ear cups feels great and the build quality looks genuinely solid in person.

Sennheiser HD 550

At roughly 237g the HD 550 is the lightest model in the HD 500 line, with reduced clamping force and breathable velour pads that make it comfortable for long listening. The catch is an underpadded headband with no central cutout, and a minimalist, all-plastic build that several reviewers find drab and a step down in heft from older Sennheisers.

• At 237g the HD 550 is the lightest headphone in the HD 500 series, and Sennheiser has reduced clamping force enough that pad pressure is barely noticeable for long sessions.
• Trusted Reviews says the HD 550 are more comfortable than they look, helped by well-judged memory-foam earpads in synthetic velour, a synthetic-leather headband and appropriate clamping force.
• The build is mostly unremarkable plastic — Trusted Reviews notes it doesn't look or feel special, and the HD 550 don't fold, with only a little hinge movement for fit.
• Headphones.com really dislikes the headband pad — no central notch and insufficient padding make the HD 550 among the less comfortable lightweight headphones tested, undercutting how light the frame is.
• Headfonics wishes Sennheiser had kept the V-shaped headband cutout from the HD 560S that relieves the central top-of-head pressure point — a cheap fix that benefits the user.

Audio-Technica ATH-M50xEnso

The Enso is a fully passive wired headphone — no battery, no Bluetooth, no ANC. Its 38-ohm load drives easily from any device, the detachable cables can be swapped if damaged, and the wired link means zero latency and total reliability.

• The Enso ships with two detachable cables — one straight and one coiled — and covers a 15–28,000 Hz frequency response from its closed-back dynamic driver.
• At 38 ohms impedance the M50x gets full volume and good sound quality from almost any device, because it doesn't need much power to drive.
• The headset doesn't need additional amplification — plug it into virtually any device and the volume will be sufficient.
• Because it's wired with no Bluetooth or ANC, it can feel old-school in 2026, but the wired connection gives it a real advantage in latency and reliability.
• Since it doesn't rely on batteries or Bluetooth, it's bound to outlast its wireless counterparts — good sound is timeless.
• A bundled quarter-inch screw-on adapter lets it connect to audio interfaces, mixers and stereo receivers, and the detachable cables mean a damaged cable is cheap to replace.
• It comes with an adapter to plug into audio interfaces or amplifiers — a really nicely rounded package for a wired headphone.

Sennheiser HD 550

A purely passive wired open-back: no battery, no Bluetooth, no ANC. The HD 550 uses a 38mm dynamic driver with a 150Ω impedance and 6Hz–39.5kHz response, terminating in a proprietary 2.5mm twist-lock connector. It runs acceptably from a dongle but clearly improves with a proper DAC/amp, and the limited included cable is a common gripe.

• The HD 550 uses a custom angle-mounted 38mm dynamic transducer with a 150Ω impedance, a 6Hz–39.5kHz frequency response and a 106.7 dB SPL — built at Sennheiser's audiophile facility in Tullamore, Ireland.
• At 150Ω the HD 550 isn't especially power-hungry and can run from a laptop or phone, but Audio46 found it benefits significantly from a dedicated DAC/amp, which brought out detail and low-end control.
• Headfonics notes the HD 550 is more versatile than older 300Ω Sennheisers — its 150Ω impedance pairs with a wider range of equipment — but still recommends a separate amplifier for more headroom.
• It ships with just a basic 1.8m cable terminating in a 3.5mm plug plus a screw-on 6.35mm adapter — Trusted Reviews flags that a longer or balanced cable costs extra.

Audio-Technica ATH-M50xEnso

As a collectible 10th-anniversary edition, the Enso's value rests on whether the artwork appeals — the audio is identical to the standard M50x. Reviewers still rate the M50x platform a strong wired buy, while rivals like the AKG K371 and Sennheiser HD 280 Pro / HD 58X compete hard on sound and comfort.

• The Enso is positioned as a celebration of legendary performance with a new symbolic look and a level of rarity Audio-Technica hasn't offered in years — its value is partly collectible.
• For its price and longevity, the M50x remains one of the best do-everything wired over-ear headphones you can buy.
• RTINGS calls the M50x one of the best values on the market thanks to its strong price-to-performance ratio for critical listening.
• The AKG K371 sells around the same price, follows the consumer target curve more closely, isolates slightly better and is more comfortable for glasses-wearers — though the M50x feels more durable.
• Against the Sennheiser HD 280 Pro the M50x is better built and noticeably more comfortable with spare cables included — overall better value even at its higher price.
• Some audiophiles argue the M50x is overhyped by casual buyers and there are headphones in its price range, such as the Sennheiser HD 58X, that outperform it for casual listening.
• Reddit owners are split — many love their M50x for everyday music, while critics note it was over-hyped as the best closed-back ever, fuelling an audiophile backlash.

Sennheiser HD 550

Launched around $349.95 and now widely seen at $299 or lower, the HD 550 sits in a crowded open-back field against its own siblings — the HD 505, HD 560S and the legendary HD 6XX/HD 600. Reviewers agree it is the most complete-sounding 5-series model, but disagree on whether it beats the cheaper HD 6XX on outright value.

• The HD 550 launched at $299.95-$349.95 (£249 / €299) and is frequently discounted lower — Audio46 listed it as low as $199.95 on sale.
• Headphones.com's chief reservation is value — it argues the HD 550 still isn't as good a buy as the cheaper, legendary HD 6XX, even while praising the HD 550's tuning.
• The Headphone Show calls the HD 6XX the indisputable value king of the price range, but still rates the HD 550 a personal favourite and one of its preferred Sennheisers.
• Major HiFi's HD 550 vs HD 560S verdict: the HD 560S is the pick for accuracy-obsessed audiophiles and pros, while the HD 550 is the more relaxed, musical listen with a more holographic soundstage.