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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-07 · 8 min read · Independent comparison
If you want a low-impedance in-ear monitor that plugs straight into a laptop, phone or controller for meetings and gaming, choose CVJ Jemine IEM; if you need a studio-grade bass preamp and DI box with a dedicated headphone output for silent practice and recording, choose FUNFANG Bass Preamp Pedal. These two products don't compete — they solve different problems, and one of them is the piece that actually handles high impedance studio headphones correctly in a signal chain.
• CVJ Jemine IEM — biggest strength: a 10mm dual-magnetic dynamic driver plus a moving-iron unit, a 22 ohm impedance, 99 dB sensitivity and a detachable silver-plated 0.78mm 2-pin cable, all at just 7 grams per earbud.
• CVJ Jemine IEM — biggest trade-off: it is a wired 3.5mm in-ear with passive noise cancellation only, so it depends entirely on whatever device you plug it into and offers no amplification or EQ of its own.
• FUNFANG Bass Preamp Pedal — biggest strength: a real studio-style front end — 18V center-negative power, 4-band EQ, Bright/Deep voicing switches, Pre/Post DI routing and a ground lift switch.
• FUNFANG Bass Preamp Pedal — biggest trade-off: it is a bass instrument preamp first. It wants a bass in, it wants an 18V supply, and it is not a portable listening device.
• Who each pick is for: the CVJ Jemine is for anyone who wants cheap, light, plug-and-play in-ears for meetings, calls and gaming; the FUNFANG is for bass players and home recordists who need clean tone shaping, DI output and a headphone out for silent practice.
• The high-impedance angle: neither product is high impedance itself, but the FUNFANG's headphone output is the part of this pair that belongs in a conversation about driving high impedance studio headphones.
The CVJ Jemine is a wired in-ear monitor built around a 10mm dynamic driver with a dual-magnetic circuit and a magnesium-aluminum alloy composite diaphragm. CVJ's own framing is about transient speed — fast footsteps, distant reloads, the small details that matter when you're gaming. There's also a moving-iron unit in the hybrid setup, which is where the "1DD+1BA" in the name comes from. Practically speaking, that combination is what gives the Jemine its punchy low end and its ability to keep detail intact at low volumes.
For everyday work, the numbers that matter most are 22 ohm impedance and 99 dB sensitivity. That's an easy load — it means a laptop headphone jack, a phone, a PS5 controller or a Switch will drive these to a usable level without help. The 3.5mm plug and 1.25m tangle-resistant cable cover Android and Windows phones, MP3 players, speakers, PCs and audio interfaces. If you're the person who joins meetings from a laptop and wants something lighter than a headband set, or you want wireless headphones for meetings but keep getting burned by latency and charging, a wired IEM like this sidesteps both problems — no battery, no pairing, no lag, just plug in.
The ergonomics are worth calling out because they're the reason IEMs work for long calls. Each earbud is about 7 grams, molded from cochlea-fit data so it sits like a custom in-ear, and CVJ claims it stays put during vigorous movement. Passive noise cancellation comes from the seal, not electronics, which is fine for a noisy room but not a substitute for active ANC.
Who should buy it: gamers, call-heavy workers, musicians who want a cheap backup monitor, and anyone who wants a detachable-cable IEM they can repair instead of replace. The 0.78mm 2-pin standard and the magnetic replaceable faceplate — which is interchangeable with CVJ's Nozomi series — are genuinely nice touches at this tier.
Who should skip it: anyone who needs active noise cancellation, wireless freedom, or a built-in mic array for conference calls. And if you're chasing the high impedance studio headphone experience, this isn't that product. A 22 ohm IEM is the opposite end of the spectrum.
The FUNFANG Bass Preamp Pedal is a different animal entirely. It's a DI box and bass preamp running on an 18V center-negative supply, and that higher internal voltage is the whole point: more headroom, less noise, and a cleaner DI output than a typical 9V pedal can manage. If you record bass direct or play stages where the house system takes a DI feed, that's the feature doing the work.
The EQ section is the most detailed part of the spec sheet. Four bands: 40Hz with ±17 dB for bass, 300Hz with ±15 dB for low mids, 800Hz with ±14 dB for high mids, and 4kHz with ±14 dB for treble. Those are wide, generous ranges — you can scoop the low mids for a modern slap tone or push 40Hz for reggae-weight bottom without touching anything else. On top of that, the Bright and Deep toggles add high-frequency brilliance above 3kHz or depth below 250Hz, independently or together.
Then there's the routing. Pre/Post DI channel selection lets you send either the raw bass or the EQ'd signal to the board, and the ground lift switch kills hum when you're patched into a recording interface or a PA in a building with questionable wiring. That combination — selectable DI tap plus ground lift — is exactly what you want when a session goes sideways and you can't find the buzz.
Who should buy it: bass players who record direct, gigging musicians who need a reliable DI with a ground lift, and anyone who practices at night through headphones and wants EQ control rather than a raw instrument signal.
Who should skip it: guitarists expecting a general-purpose dirt pedal — this is a clean preamp, not an overdrive. And anyone who wants a battery-powered, throw-it-in-a-gig-bag stompbox, because it wants an 18V supply.
Side-by-Side: Which Should You Choose?
• Best for meetings and calls → CVJ Jemine IEM. The 3.5mm plug, mic-equipped version, 7g fit and 22 ohm impedance make it a plug-and-play pick for laptop and controller audio.
• Best for gaming detail → CVJ Jemine IEM. The hybrid 1DD+1BA setup and fast transient diaphragm are aimed squarely at positional cues and quick sound shifts.
• Best for battery-free reliability → CVJ Jemine IEM. No charging, no pairing, no latency; the detachable silver-plated cable is replaceable if it wears out.
• Best for tone shaping → FUNFANG Bass Preamp Pedal. Four bands with wide boost/cut ranges plus Bright and Deep toggles give you far more control than any IEM can.
• Best for recording and stage → FUNFANG Bass Preamp Pedal. Pre/Post DI selection and a ground lift switch are studio and live tools, not listening features.
• Best for silent practice with backing tracks → FUNFANG Bass Preamp Pedal. The 1/8" Aux In and headphone output with its own mix control are built for exactly that.
• Best for high impedance studio headphones → FUNFANG Bass Preamp Pedal. Its headphone output is a real amplification stage, which is what high impedance cans need; a 22 ohm IEM needs nothing.
• Best for portability → CVJ Jemine IEM. It weighs almost nothing and needs no power supply.
My Verdict
do high impedance headphones sound better
Not automatically. Higher impedance mainly changes how much voltage a source needs to drive them properly. Whether they sound better depends on the driver design and on having an amp with enough output — which is precisely why a headphone output on a preamp or interface matters for high impedance cans.
is high impedance good for headphones
It can be, in the right setup. High impedance loads are generally easier on amplifier output stages and can reduce hiss with some gear, but they need more voltage to reach the same volume. Low-impedance gear like the 22 ohm CVJ Jemine is the opposite approach: easy to drive from a phone or laptop jack.
are high impedance headphones better
Better for some uses, worse for others. They tend to suit studio and home setups with a dedicated amp or headphone output, like the one on the FUNFANG Bass Preamp Pedal. For portable, plug-into-anything listening, low impedance in-ears are the more practical choice.
why are high impedance headphones better
The common argument is headroom and noise. A higher impedance load draws less current, which can mean less distortion and a quieter noise floor from a capable amplifier. The catch is that without that amplifier, high impedance headphones can end up quiet and thin.
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