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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want a single high-impedance planar that shrugs off background hiss and lets you voice it nine different ways, choose Hidizs MP145; if you need a low-impedance quad-driver hybrid that stays bright and detailed straight off a phone, choose HIFIXAUDIO SIMGOT SuperMix 4. Those are two genuinely different philosophies, and which one wins comes down to your source and your taste — not to which box looks fancier.
• Hidizs MP145 — biggest strength: one 14.5 mm planar driver with a 14x N52H magnet array hitting roughly 1 Tesla flux density and under 0.05% distortion, tuned in-house to the H-2019 curve at ±0.5 dB. Add three pneumatic tuning filters and three sets of ear tips and you get nine sound styles from one pair.
• Hidizs MP145 — biggest trade-off: at 30Ω and 104 dB sensitivity it wants a bit more current than a basic dongle can comfortably give, and at 280 g the whole package is heavier than most IEM kits. It's also a single driver, so you get planar coherence rather than driver-specialist layering.
• HIFIXAUDIO SIMGOT SuperMix 4 — biggest strength: a four-driver hybrid (10 mm dynamic + full-size balanced armature + micro planar + PZT) with RC 4-way crossovers and isolated acoustic tubes per driver, so bass, mids, and treble each get a dedicated engine instead of one diaphragm doing everything.
• HIFIXAUDIO SIMGOT SuperMix 4 — biggest trade-off: 7.2Ω impedance is extremely low. It's easy to drive, but it's also fussy about output impedance — a high-impedance source can tilt the tuning. The 3.5 mm fixed jack also means no native balanced option.
• Pick Hidizs MP145 if you listen on a dedicated player, dongle DAC, or desktop setup and want to tune your own sound.
• Pick HIFIXAUDIO SIMGOT SuperMix 4 if you want one cable, one plug, and a balanced hybrid tuning that works from a laptop or phone.
The MP145 is built around a single planar magnetic driver, and everything about the spec sheet points in one direction: accuracy with zero phase shift. The 14x N52H magnet array is arranged in a 7+7 biaxial compression system that the brand says pushes flux density to roughly 1 Tesla with distortion under 0.05%. In plain terms, that's a lot of magnetic control over a very thin diaphragm, which is what lets a planar reproduce micro-detail — the texture of a bow dragging across strings, the breath before a note — without smearing it. Frequency response is quoted at 20Hz–40kHz, and the tuning was done on a B&K HAT in the brand's own acoustic lab to land within ±0.5 dB of the H-2019 curve with HRTF spatial mapping.
What makes it unusual is the tuning system. Three pneumatic tuning filters change the airflow through the housing, and three sets of ear tips (voice, balanced, bass) shift the high, mid, and low emphasis. Stack those and you get nine combinations — a bass-forward filter with bass tips, a neutral filter with voice tips, and so on. That's a real advantage if you own several headphones and want one pair to cover more moods. The housing itself is aerospace aluminum with a 12-layer CNC-milled shell and dual hidden ventilation ports, and the cable is 4x 99.9999% OCC silver-plated with a 4.4 mm balanced termination.
Who should buy it? Someone with a proper source. At 30Ω and 104 dB sensitivity, the MP145 is efficient but not effortless — a phone headphone jack will make sound, but a portable DAC or a player with a 4.4 mm output is where the low-distortion planar actually shows what it can do. The 4.4 mm cable reinforces that: it's aimed at balanced-output gear.
Who should skip it? If you want a single plug-and-play pair that sounds its best from a laptop and nothing else, the balanced cable and the tuning-filter fiddling will annoy you. And if you chase maximum bass slam, a single planar isn't the tool — you'll want a dedicated dynamic driver for that.
The SuperMix 4 takes the opposite approach: instead of one driver doing everything, it splits the job across four. A 10 mm dynamic driver handles the low end with a polymer nano-diaphragm, flex suspension, and dual neodymium magnets. A full-size balanced armature covers mids and lower treble — the brand specifically calls out that a full-size BA holds vocal density better than the smaller units some hybrids use. A micro planar driver handles the clean upper detail, and a PZT transducer extends the top end for air and resolution. Each driver gets its own acoustic tube inside a 3D-printed resin housing, with RC 4-way crossovers and isolated signal paths to kill phase distortion at the handoffs.
That architecture is the reason to buy it. A well-executed hybrid can give you deep, textured sub-bass and articulate, breathy vocals in the same earphone without either one stepping on the other — something a single driver has to compromise on. The tuning references the H-2019 target curve too, and the brand describes the result as naturally balanced with emotional vocal rendering and an accurate stage. The shell is a translucent 3D-printed resin body with a CNC-milled metal faceplate, which the brand says also helps suppress standing waves. The cable is Litz silver-plated with a 0.78 mm 2-pin connector and an oxidation-resistant jacket, terminated in a fixed 3.5 mm plug.
The headline number is 7.2Ω impedance with 120 dB sensitivity. That's genuinely easy to drive — a phone, a laptop, a cheap dongle, a controller, anything with a 3.5 mm hole will get loud results. That makes it the more flexible of the two for casual, multi-device use, and the gaming-and-movies theme in its listing fits that: it's meant to live plugged into whatever you already own.
Side-by-Side: Which Should You Choose?
• Best for detail and micro-texture → Hidizs MP145. A single planar with ~1 Tesla flux density and under 0.05% distortion is engineered for exactly that.
• Best for raw driver layering → HIFIXAUDIO SIMGOT SuperMix 4. Four driver types with dedicated tubes and 4-way crossovers means each band gets a specialist.
• Best for easy driving from anything → HIFIXAUDIO SIMGOT SuperMix 4. 120 dB sensitivity at 7.2Ω versus 104 dB at 30Ω — the hybrid needs far less voltage.
• Best for source-quality scalability → Hidizs MP145. 30Ω and a 4.4 mm balanced cable reward a better DAC, where the low-distortion planar is audible.
• Best for tuning flexibility → Hidizs MP145. Three pneumatic filters plus three tip sets equals nine voicings; the SuperMix 4 is tuned one way.
• Best for long, fatigue-free sessions → HIFIXAUDIO SIMGOT SuperMix 4. The PZT and planar top end is described as airy and non-harsh, paired with a balanced armature for smooth mids.
• Best for bass weight → HIFIXAUDIO SIMGOT SuperMix 4. A 10 mm dynamic driver with extended excursion is purpose-built for sub-bass; the MP145 leans rich and warm rather than slam-heavy.
• Best for build feel → Hidizs MP145. A 12-layer CNC-milled aluminum housing with a whale-fin contour, versus the SuperMix 4's resin shell with a metal faceplate.
In my opinion, the HIFIXAUDIO SIMGOT SuperMix 4 is the smarter buy for most people. It's easy to drive from almost anything, it gives you four driver types working in their own lanes, and it doesn't ask you to own a balanced-output player to hear what you paid for. I'd pick the Hidizs MP145 only if you already have a proper DAC or player and you actually enjoy swapping filters to chase a sound — because that's where its single planar and nine voicings earn their keep. Different ears, different answers, but for a first serious IEM, the hybrid is the safer, more rewarding pick.
The SuperMix 4, clearly. At 120 dB sensitivity and 7.2Ω it needs very little power and plays loud from a phone or laptop. The MP145's 104 dB and 30Ω is still efficient, but it benefits noticeably from a dedicated DAC or a 4.4 mm balanced source.
For sub-bass weight and impact, the SuperMix 4's dedicated 10 mm dynamic driver with extended excursion is the more direct answer. The MP145's planar delivers rich, warm lows with good texture, but a single planar typically trades some physical slam for speed and coherence.
No amp needed — it ships with a Litz silver-plated 2-pin cable and a 3.5 mm plug, and its low impedance makes it forgiving of everyday sources. Just avoid sources with unusually high output impedance, which can tilt the tuning.
Both sit in the same rough bracket, so the deciding factor is your setup, not the sticker. Check the current price on Amazon and compare against what you'd spend on a DAC for the MP145 — that total is the real cost of choosing the planar.
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