We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-22 · 7 min read · Independent comparison
If you want a proven, flat-tuned studio headphone for critical tracking and mixing, choose Audio-Technica ATH-M40x; if you need to get a whole band or podcast panel monitoring at once, choose Rockville PRO-M50. These two products are not really competing for the same desk — one is a single pair of reference headphones built around accuracy, and the other is a four-headphone bundle with a four-channel amp built around collaboration. That single distinction should decide most of this for you before you read another word.
• Audio-Technica ATH-M40x — biggest strength: 40mm neodymium drivers with copper-clad aluminum voice coils tuned for flat response, plus 90-degree swiveling earcups for single-ear monitoring. It is a mixing tool first.
• Audio-Technica ATH-M40x — biggest trade-off: It is one pair of wired headphones with no amplifier, so it solves a personal monitoring job, not a group one.
• Rockville PRO-M50 — biggest strength: You get four PRO-M50 headphones plus the RHPA4 four-channel amp, four cables, four cases and four extra ear pads — an entire multi-person monitoring rig in one package.
• Rockville PRO-M50 — biggest trade-off: That bundle is bulky and heavier overall (7 pounds for the kit), and the 32-ohm, 10Hz–25kHz tuning is aimed at versatile monitoring rather than a strict flat-response reference.
• Pick the ATH-M40x if you are one person doing mixing, tracking or DJ work and want isolation and foldable portability.
• Pick the Rockville PRO-M50 kit if you are a producer, podcaster, band or teacher who needs several people hearing the same source with independent volume control.
The ATH-M40x is the classic "one good pair" studio headphone. Its 40mm neodymium drivers use copper-clad aluminum voice coils, and the whole tuning is aimed at flat response — meaning what you hear is meant to resemble the source rather than flatter it. For anyone tracking vocals or instruments, that matters: a headphone that adds bass or sparkle will make you mix against a lie. The circumaural, around-the-ear design also seals around the ear for sound isolation, which is exactly what you want when a loud amp or drum kit is in the room and you still need to hear the click track.
The details show a headphone designed to be worked in, not just worn. The earcups swivel up to 90 degrees so you can flip one side off for single-ear monitoring — the standard move when you're checking a take against the room. The cable is detachable and single-sided, and both coiled and straight cables are included, so you can match the cable to the job. It folds down into the included carry pouch, and at 8.5 ounces with an aluminum enclosure, it's a genuinely portable option for engineers who move between rooms. The 3.5mm jack with volume control rounds out a wired, no-fuss setup.
Who should buy it? The solo engineer, the bedroom producer, the DJ who wants isolation and a swivel cup, the musician who tracks alone and needs one honest reference. Who should skip it? Anyone whose real problem is that four people need to hear the same mix at the same time. One pair of headphones, no matter how good, cannot solve that. If your sessions are collaborative by nature, keep reading.
The PRO-M50 is sold here as a system, not a single product: four PRO-M50 headphones, each with a detachable coil cable, a case and an extra ear pad, plus the Rockville RHPA4 four-channel headphone amplifier. Each PRO-M50 uses 40mm neodymium drivers in a closed-back, circumaural design for accurate monitoring, with interchangeable suede and leather earpads so each user can pick the feel they prefer. The plug is gold-plated 3.5mm with a ¼" adapter included, and every headphone comes with its own protective leather hard travel case. That last point is underrated — four people, four cases, no tangled mystery cables in a bag.
The amp is what makes this package interesting. The RHPA4 powers up to four headphones with low-noise amplification, and each channel has its own volume control and a stereo/mono switch. Those two features are the difference between a usable rehearsal setup and a frustrating one: the drummer who wants it loud and the singer who wants it quiet can both be happy, and a mono switch is genuinely useful for checking phase and for anyone monitoring a single-source feed. Each channel also has dual outputs — ¼" and 3.5mm — so up to eight headphones can be connected at once without giving up signal quality.
Connectivity is flexible: the RHPA4 takes both ¼" and 3.5mm inputs and outputs, and it runs bus-powered from USB or a power bank with the included USB cable and charging brick. The metal housing is built to survive being moved around. The headphones themselves are 32-ohm with a 10Hz–25kHz frequency range, which is an easy load for phones, interfaces and the included amp alike.
Who should buy it? Podcasters recording multiple hosts, bands rehearsing with a shared click and backing track, teachers running a listening session, small studios that regularly track several musicians at once. Who should skip it? The solo mixer who wants one neutral reference pair and nothing else — the extra headphones and amp would simply sit in a closet.
• Best for flat, reference-grade mixing → Audio-Technica ATH-M40x. The copper-clad aluminum voice coils and flat tuning are built for judging a mix.
• Best for monitoring a whole group at once → Rockville PRO-M50. Four headphones plus a four-channel amp with independent volume per channel.
• Best for single-ear tracking work → Audio-Technica ATH-M40x. The 90-degree swiveling earcups exist precisely for this.
• Best for flexible fit and comfort across users → Rockville PRO-M50. Interchangeable suede and leather earpads let each person choose.
• Best for travel and portability → Audio-Technica ATH-M40x. It folds down into a pouch at 8.5 ounces; the Rockville kit weighs 7 pounds and includes an amp.
• Best for cable options out of the box → Audio-Technica ATH-M40x. Both coiled and straight detachable cables are included.
• Best for odd cable lengths and damaged-cable replacement → Rockville PRO-M50. Each headphone has its own detachable coil cable, and each gets a hard case.
• Best for mono checking and phase work → Rockville PRO-M50. The RHPA4 has a stereo/mono switch per channel.
• Best for scaling past four listeners → Rockville PRO-M50. Dual outputs per channel allow up to eight headphones.
In my opinion, the right answer here comes down to how many ears you need to serve. If you are one person doing serious mixing, tracking or DJ work, I would buy the Audio-Technica ATH-M40x — the flat-tuned drivers, the isolation, the swivel cups and the foldable, pouch-ready design are exactly what a single engineer needs, and nothing in the Rockville package improves on that for solo work. But if your sessions involve other people — a band, a podcast panel, a class — I would buy the Rockville PRO-M50 kit, because four headphones and an amp with per-channel volume and mono switching solve a problem the M40x simply cannot. Buy for the job you actually do.
For one person mixing on a neutral reference, yes — in my opinion the ATH-M40x's flat-response tuning and 90-degree swivel cups are purpose-built for it. The PRO-M50 is tuned for versatile monitoring across several users rather than strict reference work.
No. The RHPA4 is there to power up to four headphones with independent volume and stereo/mono per channel. If you only ever monitor alone, the amp adds bulk you will not use, and a single pair like the ATH-M40x makes more sense.
They ship with both suede and leather earpads that you can swap, so you can choose the feel you prefer. That interchangeability is a real advantage when several different people share the same headphones over a long rehearsal or recording day.
Value depends on your setup, so check the current price on Amazon for both before deciding. The M40x is a single-pair purchase; the PRO-M50 is a four-headphone-and-amp package, so compare what each actually gives you per listener.
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