We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-02 · 6 min read · Independent comparison
If you want serious in-ear monitor sound for music, gaming and critical listening, choose Linsoul Kiwi Ears Cadenza; if you need flat, side-sleeper-friendly earbuds you can wear in bed and at work, choose goazzzl Flat Sleep Earbuds.
• Linsoul Kiwi Ears Cadenza — biggest strength: a genuine audiophile build. A 10 mm titanium-coated dynamic driver, the KARS 2.0 acoustic resonance system, a CNC-machined aluminum faceplate and a detachable 0.78 mm 2-pin single-crystal copper cable. This is a wired IEM made to reveal detail.
• Linsoul Kiwi Ears Cadenza — biggest trade-off: it's wired only, has no microphone, and no noise control. It's a listening tool, not a sleep or call device.
• goazzzl Flat Sleep Earbuds — biggest strength: the shape. A super-flat, low-profile design plus a tiny 0.1 oz body built for small ear canals and side sleepers, with Bluetooth 5.4, a 66H battery claim via the charging case and two sets of buds in one pack.
• goazzzl Flat Sleep Earbuds — biggest trade-off: sound isolation rather than true noise cancelling, a 6-hour single-charge figure, and a focus on comfort and convenience over audio fidelity.
• Pick the Cadenza if music quality, tonal balance and a replaceable cable matter most.
• Pick the goazzzl if you fall asleep on your side, have small ears, or want one set that covers both night and day.
The Cadenza is unapologetically an in-ear monitor. Everything about it points at sound quality first: a titanium-coated polyethylene terephthalate diaphragm driver, a redesigned KARS 2.0 resonance system that shapes airflow inside the shell to control low-end output, and tuning described around an 8 dB sub-bass shelf cutting off at 200 Hz, a gentle 300–400 Hz lift for vocal warmth, and a treble peak at 3 kHz with smooth, extended decay. In my opinion, that combination is exactly what you want if you listen analytically — vocals that sit forward without sounding thin, bass that reaches deep without smearing the mids.
The physical package matches the intent. The shell is a polycarbonate composite with a velvet-like texture, and the faceplate is CNC machined from aerospace-grade aluminum with a laser-engraved honeycomb pattern. Impedance is 18 ohm and sensitivity is 106 dB, which tells you it's easy to drive from a phone or a dongle, and the frequency range is listed at 10–29 kHz. The 2-pin 0.78 mm detachable cable in single-crystal oxygen-free copper means you can swap cables later instead of replacing the whole earphone, which is a real longevity advantage.
Who should buy it: anyone who wants a wired IEM for music, gaming, studio-style listening, or just hearing more of what's in a track. Who should skip it: side sleepers, people who want wireless freedom, anyone who needs a mic for calls, and anyone who wants active noise cancelling — the Cadenza has none, and it's wired with a 3.5 mm jack.
The goazzzl set solves a completely different problem. The headline feature is the super-flat, low-profile housing that won't press into your ear when you lie on your side — the classic reason people give up on earbuds at night. The buds themselves weigh 0.1 oz and are sized for small ear canals, so they sit snug and nearly invisible during long wear.
What makes the package interesting is the dual-bud setup. You get two kinds of earbuds in one box: mini earbuds for work and daily use, plus ultra-flat sleep earbuds for the night. Each pair works independently, so you can use one while the other charges — which is how the 66H figure is reached, since each bud is rated at 6 hours of average life and the wireless charging case tops them up. Connectivity is Bluetooth 5.4, controls are touch-based, and the noise control is sound isolation rather than active cancellation. The sound is described as clear and soft rather than harsh, which is the right call for white noise, audiobooks and sleep.
Who should buy it: side sleepers, people with small ears who find normal buds painful, travelers, and anyone who wants one product for both work and bed. Who should skip it: listeners chasing resolution, tonal accuracy and a wired, upgradeable connection — that isn't what this product is built for.
• Best for sound quality → Linsoul Kiwi Ears Cadenza. A dedicated titanium-coated dynamic driver, KARS 2.0 tuning and 10–29 kHz range are aimed squarely at fidelity.
• Best for sleeping on your side → goazzzl Flat Sleep Earbuds. The flat, low-profile shape exists specifically so it won't dig into your ear overnight.
• Best for small ear canals → goazzzl Flat Sleep Earbuds. The 0.1 oz mini design is built around small ears.
• Best for wireless freedom → goazzzl Flat Sleep Earbuds. Bluetooth 5.4 with a charging case versus a fixed 3.5 mm cable.
• Best for long sessions away from a charger → goazzzl Flat Sleep Earbuds. 66H total with the case and the use-one-while-the-other-charges system.
• Best for gaming and studio-style listening → Linsoul Kiwi Ears Cadenza. Low 18 ohm impedance and 106 dB sensitivity make it easy to drive, and the detachable 2-pin cable lets you run a longer or different cable.
• Best for calls and voice → goazzzl Flat Sleep Earbuds. Touch controls and a wireless setup, where the Cadenza ships without a mic.
• Best for repairability and long-term ownership → Linsoul Kiwi Ears Cadenza. A replaceable cable means a worn cable doesn't kill the earphones.
If I had to pick one, I'd buy the Linsoul Kiwi Ears Cadenza — because I care most about how music actually sounds, and a dedicated titanium-coated driver, KARS 2.0 low-end tuning and a detachable cable are the things that matter to me. I'd steer you to the goazzzl Flat Sleep Earbuds instead if your problem is comfort in bed or tiny ears, since no amount of tuning fixes a bud that hurts when you roll over. Two different jobs, two different answers. Check the current price on Amazon before deciding, then match the product to the job you actually have.
how to clean in ear earbuds
Wipe the nozzle and housing with a dry, soft cloth after each use, and use a small brush or a gentle puff of air to clear earwax from the mesh — never push it deeper with a pin. For the Cadenza, the 2-pin cable detaches so you can clean the shell without stressing the connector. For the goazzzl buds, keep the charging case contacts dry and wipe the buds before they go back in.
how to put in ear earbuds
Seat the bud so the nozzle points into the ear canal and the body sits flush against the outer ear, then give it a gentle quarter turn to seal. The goazzzl sleep buds are designed to sit almost flat against the ear so nothing presses when you lie down. The Cadenza is worn with the cable routed over the ear for a stable, low-microphonic fit.
how to fit in ear earbuds
Fit is about getting a seal without pressure: try the tip sizes you have, and if sound feels thin or bass disappears, the seal is broken rather than the earphone being wrong. Small ear canals are exactly why the goazzzl buds are sized at 0.1 oz and described as mini. With the Cadenza, a proper seal is what lets that 8 dB sub-bass shelf actually reach you.
how to ear earbuds
Match the shape to the job: a wired IEM like the Cadenza goes in over-ear with the cable behind your ear for listening sessions, while a flat bud like the goazzzl goes in shallow and stays put for sleep and work. If you're lying on your side, flat and low-profile wins every time. If you're gaming or mixing, the sealed, wired fit wins.
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