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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want an open-air, neutral-leaning headphone for digital instruments and long desk sessions, choose Yamaha HPH-150B; if you need in-ear isolation with a planar-magnetic driver you can drive from almost anything, choose erjigo KZ PR3.
• Yamaha HPH-150B — biggest strength: open-air, neutral tone palette tuned for faithful reproduction of digital instrument sounds, with 90-degree swivel drivers, velour pads and a 2 m cable that reaches a keyboard or interface easily.
• Yamaha HPH-150B — biggest trade-off: it is an open-air design with no noise control at all, so it leaks sound both ways and does nothing to shut out a room.
• erjigo KZ PR3 — biggest strength: a 13.2 mm self-developed planar magnetic driver with a nano-level silver-plated diaphragm in an in-ear shell, with memory foam tips that isolate outside noise.
• erjigo KZ PR3 — biggest trade-off: it lives inside your ear canal, and there is no mic option on this version, so it is not a call headset.
• Pick the Yamaha if you play or monitor a digital instrument at a desk and want a one-earcup-out, open feel.
• Pick the KZ PR3 if you want a sealed, isolating in-ear monitor for critical listening, mixing on the move, or noisy rooms.
The Yamaha HPH-150B is built around a very specific idea: a neutral tone palette with faithful reproduction of digital musical instrument sounds. In my opinion that is the whole personality of this headphone. It is not trying to be a bass monster or a club can. It is trying to hand you back what you played, without adding much color. If you sit at a digital piano, a synth or a modeling rig and you want to hear the patch as it was written, that neutrality is the point.
Physically, it is a wired over-ear with a dynamic driver, a 32 ohm impedance rating and a stated frequency range of roughly 20 Hz to 20 kHz. The earpads are small, soft, light-weight velour, and the driver housings swivel up to 90 degrees so you can match the angle of your ears — a small thing that matters a lot once you have been wearing them for three hours. They weigh about 133 g with the cable, which is light enough that "comfortable listening for extended periods" is not just marketing filler. The 2 m cable with gold-plated plugs is generous for reaching a keyboard or an audio interface, and the detachable standard stereo plug arrangement means you can move between 3.5 mm and 6.3 mm connections without hunting for an adapter.
Who should buy it: instrumentalists, home-studio tinkerers, and anyone who wants an honest, uncolored open-air headphone for practice and long sessions. Who should skip it: commuters, office workers in shared space, and anyone who needs isolation. The HPH-150B has no noise control, and open-air means your music goes out and the room comes in. That is a design choice, not a defect — but it rules the headphone out for a lot of modern listening.
The erjigo KZ PR3 takes the opposite approach. It is an in-ear monitor built around a 13.2 mm planar magnetic driver, paired with a nano-level silver-plated diaphragm. Planar drivers are usually the expensive, hard-to-drive end of the hobby; the PR3's whole pitch is that you get that driver type in an in-ear shell. The diaphragm plating is there to improve conductivity, and the 32 ohm impedance rating means ordinary playback devices can drive it — no dedicated amp strictly required, which is a real convenience if your source is a phone, a laptop or a small dongle.
The sound description the brand leans on is a strong treble, deep and clear bass without blurring or distortion, and a more balanced midrange with clearly present vocals and instruments. KZ also emphasizes the acoustic curve and the soundstage width and depth. Whether those claims land for you depends on fit, but the driver type and the design choices line up with a detailed, energetic presentation rather than a warm, relaxed one.
The housing is a light luxury metal cover with an ergonomic, lightweight shape, and the brand says it stays comfortable over long wear. The memory foam eartips give real sound isolation, which is the single biggest functional difference from the Yamaha. The cable is a silver-plated double parallel detachable wire — detachable being the useful part, since it is the first thing to fail on any wired in-ear. This version ships without a mic, so treat it as a listening tool, not a headset.
Who should buy it: audio engineers, musicians, and listeners who want an isolating in-ear with a planar driver and a detachable cable. Who should skip it: anyone who dislikes things sitting in their ear canal, and anyone who needs to take calls.
Side-by-Side: Which Should You Choose?
• Best for playing a digital instrument at a desk → Yamaha HPH-150B. Neutral palette, 2 m cable, 6.3 mm-ready connections.
• Best for isolation in a noisy room → erjigo KZ PR3. Memory foam tips and sound isolation are built in; the Yamaha has none.
• Best for detail and soundstage on the move → erjigo KZ PR3. Planar magnetic driver and a sealed fit put you inside the mix anywhere.
• Best for driving straight from a phone or laptop → erjigo KZ PR3. 32 ohm impedance and a low-impedance diaphragm design aimed at ordinary devices.
• Best for open, uncolored listening without ear-canal pressure → Yamaha HPH-150B. Open-air by design.
• Best for cable longevity → erjigo KZ PR3. The detachable silver-plated cable can be replaced.
• Best for shared spaces / quiet studios → Yamaha HPH-150B. Open-air leaks; if you need to hear the room and not block it, that helps.
In my opinion these two are not really competitors — they solve different problems, and the "flat frequency response" question splits along that line. If your goal is a neutral, uncolored reference for a digital instrument or a quiet desk, I would buy the Yamaha HPH-150B: the open-air design, the swivel fit and the long cable are all aimed exactly at that job. If your goal is a detailed, isolating planar in-ear that travels with you and runs off whatever you already own, I would buy the erjigo KZ PR3. Decide which of those two sentences sounds like your week, and the choice makes itself.
does frequency response matter in headphones
Yes, but read it as a shape, not a number. The Yamaha HPH-150B is rated roughly 20 Hz to 20 kHz and is tuned toward a neutral palette for instrument reproduction, while the KZ PR3 is built around a planar driver and an acoustic curve meant to keep bass, mids and treble distinct. Two headphones can share a range on paper and still sound completely different, so the tuning intent behind the curve matters more than the endpoints.
Is the Yamaha HPH-150B good for studio work?
No. It is rated at 32 ohm with a nano-level silver-plated diaphragm intended to lower impedance, and the brand states ordinary playback devices can drive it. A phone, laptop or basic dongle is enough to get it going.
The KZ PR3, clearly. It is an in-ear with memory foam eartips and sound isolation listed as a feature, while the Yamaha HPH-150B is open-air with no noise control. If you listen on a train, a plane or in a shared office, the KZ PR3 is the realistic pick.
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