We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-03 · 7 min read · Independent comparison
If you want wired, high-fidelity sound with a proper audiophile tuning for music, gaming and critical listening, choose TRUTHEAR x Crinacle Zero; if you need flat, ultra-low-profile in ear earbuds that stay comfortable when you sleep on your side and run completely wire-free, choose goazzzl Flat Sleep Earbuds. These two share almost nothing except the fact that both sit inside your ear. One is a wired dual-dynamic-driver IEM built for sound quality. The other is a wireless sleep-first design built for comfort in bed. Picking between them is really about picking what you'll use them for.
TRUTHEAR x Crinacle Zero vs goazzzl Flat Sleep Earbuds at a Glance
• TRUTHEAR x Crinacle Zero biggest strength: a dual dynamic driver setup (10mm + 7.8mm) with an LCP liquid-crystal dome diaphragm, a frequency range of 20–40.5kHz, and a tuning aimed at punchy bass plus a non-fatiguing treble — genuinely serious sound engineering for wired listening.
• TRUTHEAR x Crinacle Zero biggest trade-off: it's wired only (3.5mm jack), has no noise cancelling and no battery, so it can't follow you around untethered and it isn't shaped for sleeping on your side.
• goazzzl Flat Sleep Earbuds biggest trade-off: it relies on sound isolation rather than active noise cancelling, and its 6-hour average battery life per charge means you're managing charging rather than just plugging in.
• Who the TRUTHEAR x Crinacle Zero is for: listeners who care about wired fidelity — music, gaming and long listening sessions at a desk or with a DAC/phone.
• Who the goazzzl Flat Sleep Earbuds are for: side sleepers, small-ear-canal users, and anyone who wants one wireless set that covers both work and night.
The TRUTHEAR x Crinacle Zero is, at its core, a sound-quality product. The dual dynamic driver configuration pairs a 10mm driver with a 7.8mm driver, and the diaphragm uses a polyurethane suspension composite liquid-crystal dome — the kind of material choice you normally associate with higher-end in-ear monitors rather than everyday earbuds. The cavity is built with DLP-3D printing, a process usually reserved for multi-driver and custom earphones, and the shell is finished with handmade glue work and hand polishing. Translation: this is a product whose whole reason to exist is how it reproduces music.
Who should buy it: anyone whose priority is wired sound quality — gaming (it's even themed for video game use), critical music listening, or long, focused sessions where you want detail and a controlled low end. It ships with a copper-plated silver cable, a black carrying case, and a 1-year warranty.
Who should skip it: if you want to move around untethered, if you need active noise cancelling, or if your main use case is falling asleep on your side, this isn't the right tool. The 3.5mm wired connection and rounded-tip in-ear fit are about listening, not about lying on a pillow.
goazzzl Flat Sleep Earbuds: Who It's For
The goazzzl Flat Sleep Earbuds solve a very specific, very real problem: earbuds that dig into your ear when you roll onto your side. The design is deliberately super-flat and low-profile so it won't press into your ear overnight, which is the single most common complaint about sleeping in normal earbuds. If you're a light sleeper or sensitive to pressure, that shape is the entire point.
It's also built for small ears. Each mini earbud weighs about 0.1 oz and is designed to sit snugly and almost invisibly — comfortable for long wear during the day too, not just at night. You get two kinds of earbuds in one pack: mini earbuds for work and daily use, plus the ultra-flat sleep pair for night. That means one purchase covers commuting, calls, music and sleep instead of buying separate sleep headphones and small earbuds.
The wireless side is handled by Bluetooth 5.4, with touch controls and sound isolation for blocking noise. The dual earbuds design means each pair works independently, so you can use one while the other charges — handy if you're rotating between a work pair during the day and a sleep pair at night. Battery life averages about 6 hours per charge, and the package includes a wireless charging case, a USB-C cable, and a 2-year warranty. Sound is tuned to be clear, soft and non-harsh — good for white noise, audiobooks and calm background audio rather than analytical listening.
Who should buy it: side sleepers, people with small ear canals, and anyone who wants one wireless set that transitions from desk to pillow.
Who should skip it: if you want maximum fidelity for music, or you dislike managing charge cycles, the wired TRUTHEAR is the better fit. Sound isolation also isn't the same as active noise cancelling, so a very loud environment may still get through.
• Best for sound quality → TRUTHEAR x Crinacle Zero. Dual dynamic drivers, LCP dome diaphragm, 20–40.5kHz range.
• Best for sleeping on your side → goazzzl Flat Sleep Earbuds. The flat, low-profile shape exists specifically to avoid ear pressure overnight.
• Best for small ear canals → goazzzl Flat Sleep Earbuds. Mini 0.1 oz earbuds designed for a snug, nearly invisible fit.
• Best for wired, zero-charging listening → TRUTHEAR x Crinacle Zero. A 3.5mm jack means no battery to manage, ever.
• Best for wireless freedom and portability → goazzzl Flat Sleep Earbuds. Bluetooth 5.4 with a wireless charging case.
• Best for gaming and long critical sessions → TRUTHEAR x Crinacle Zero. The tuning targets punchy bass with a non-fatiguing treble for extended listening.
• Best for one set covering work and night → goazzzl Flat Sleep Earbuds. Two earbud types plus independent dual-system charging in one pack.
• Best for noise blocking → goazzzl Flat Sleep Earbuds (sound isolation), though neither product offers active noise cancelling.
In my opinion, these aren't really competitors — they're answers to different questions. If I had to buy one for listening to music, gaming, or anything where sound quality matters, I'd buy the TRUTHEAR x Crinacle Zero without hesitation; the dual-driver design and reference-style tuning above 1000Hz are aimed squarely at people who care how things sound. But if my actual problem were falling asleep on my side, I'd buy the goazzzl Flat Sleep Earbuds, because no amount of driver engineering helps when an earbud is jamming into your ear at 2 a.m. Match the product to the job, not to a spec sheet.
how to fit in ear earbuds
Start by choosing the tip size that seals gently without pressure — goazzzl's mini earbuds are made for small canals, while the TRUTHEAR Zero uses rounded tips on a wired in-ear body. Insert with a slight twist so the tip seats at the opening of the canal, then check that the seal feels even on both sides. A good seal matters more than pushing deeper.
how to put in ear earbuds
Hold the earbud so the tip points toward your ear canal and the body rests along the natural curve of your ear. Ease it in at a shallow angle rather than straight in. For the goazzzl sleep pair, keep it flat against the outer ear so side-sleeping pressure stays off the canal; for the TRUTHEAR, route the 3.5mm cable over the top of your ear for a stable fit.
how to clean in ear earbuds
Wipe the tips and nozzle with a dry, soft cloth after each use, and gently brush away any earwax from the mesh — never push it deeper with a pin. Because the TRUTHEAR Zero is wired and the goazzzl pair is wireless, keep liquids away from the goazzzl charging case and its contacts, and avoid soaking either product even though the goazzzl set is described as waterproof.
how to ear earbuds
If you mean how to get a reliable fit every time, the routine is the same for both: test tip sizes, aim the tip at the canal, insert with a small twist, and confirm the seal by listening for a drop in outside noise. If one side feels loose, change the tip before changing anything else. Comfort first — a seal you can wear for hours beats one that's tight for ten minutes.
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