Sonic Compass · Mojo Review · IEM (universal) · Session Review
Palavox Steel Heart
A seven-driver tribrid built like a reactor core. Deep, fast bass and a holographic stage that surrounds you, and it wants a good source.
A seven-driver reactor core with a holographic wall of sound: deep, fast, controlled bass, a vast stage with real height and hyper-detail without sibilance. It comes very close to a rival about 70 per cent dearer, and it needs a good source.
- Vast, holographic stage with height
- Deep, fast, controlled bass
- Hyper-detail without sibilance
- Very close to a US$3,730 rival
- Needs a good source
Where it sits
Sonic Compass does not score gear out of ten. Gear and listeners are plotted on the same seven axes, so a review tells you where a product sits — and you can see how far that is from where you sit. A position is a description, not a grade.
- Tone ColourBalanced · 50%
- Texture DetailVery detailed · 92%
- Dynamics JumpVery punchy · 88%
- Space & ImagingVery spacious · 96%
- Timing & FlowVery rhythmic · 88%
- Comfort & FatigueVery easy-going · 82%
- Emotional EngagementVery immersive · 90%
Powerful, deep bass, a clean midrange and airy treble that never turns harsh. I did not describe the overall balance directly, so this is a tentative middle reading (high = warm on this scale).
Hyper-detailed, with micro planars and EST drivers giving clean edges and immense detail, and no sibilance.
Deep, punchy, physical bass with speed, texture and control. Sub-bass drops feel like a small subwoofer by the jaw.
Holographic and vast, wide and three-dimensional with real height. Sound behind and around the head, with space between instruments.
Very quick transients with thick note weight that clears in a moment, so dense metal never muddies.
Treble stretches out without harsh, piercing or sibilant edges, and the shell locks into the ear well. It is a hefty shell, and I did not describe long-session wear in detail.
Immersive. A feeling of being surrounded by the music that happens on only a few IEMs, and a rare gush from me.
Sonic Compass does not grade gear. We plot gear and listeners on the same seven axes, so a review tells you where a product sits and you can see how far that is from where you sit.
I know Michael, the chief engineer behind Palavox, from my trips through Shenzhen and Hong Kong, and I've reviewed most of their range on Head-Fi. This review unit was provided to me for review. Palavox is a mix of paradise and voice, and the design aim is a wide, holographic, high-end multi-driver sound.
Most of my listening was on my DAP, with some on a Schiit desktop amp, over a few weeks in China and then a month at home. I threw a playlist of every genre at it.
Listening journey
Easy, Glasser (electronic) — The bass comes in hard, deep, snappy and visceral, around the back of my head and separate from the vocals, which sit behind my nose. Synth and clicks are wide left and right, with space between everything. Clean, resolving and powerful.
Die Living (Back Road version), Illenium, David Guetta and Dustin Lynch (electronic country) — Surrounded by the music. At 1:25 the banjos float all around me, and the vocal sits in the middle with power and naturalness. Hyper-detailed with no sibilance.
Sargon's Rage, Fraser Edwards (technical metal) — Frenetic, and I can hear every guitar, bass note, drum hit, synth and voice. Transients are very quick and note weight is thick but gone in a moment. Not muddy or bleeding.
My favourite staging track (live church recording) — Guitars two to three feet out at my left temple, harmonica about a foot behind, a female vocal in front and inside my head. I feel immersed in the church. The space between instruments is almost surreal, with real height.
Sweet Dream Fanfare, Jethro Tull (prog rock) — Comes alive like a physical stage. Very high synth notes with zero sibilance, and instruments with weight, body and realism. Excellent resolution.
Health Over Gold, Let Babylon Burn (rock, AI-made track) — Quick, highly resolving, natural guitars and rumbling, clean, controlled bass. Vocals powerful and front and centre, never shouty. I can hear every subtle nuance.
| Track | Position | Note |
|---|---|---|
| Easy | 90% | Deep, snappy bass behind the head, wide synths, space between everything |
| Die Living (Back Road version) | 92% | Surrounded by the music, banjos floating, no sibilance |
| Sargon's Rage | 90% | Every instrument clear, quick transients, not muddy |
| Sweet Dream Fanfare | 92% | Physical stage, high synths with zero sibilance, real weight |
| Health Over Gold | 90% | Quick natural guitars, clean controlled bass, vocals never shouty |
Critical observations
Where the Steel Heart sits — Authoritative and vast. Space, Detail and Emotional Engagement are its strongest axes. It gives ground on source forgiveness and on price.
Bass — Super deep, punchy and powerful, with a ridiculous level of speed, texture and control. A sub-bass drop feels physical, like a mini subwoofer by my jaw, and there is no bleed into the lower mids.
Mids and treble — The micro planars give instruments and male vocals a clean edge, and acoustic guitars click with crisp realism. The two EST drivers open up the ceiling, with immense detail and no harsh, piercing treble. I heard no sibilance in my tracks.
Stage and imaging — Holographic and vast, rather than left and right inside the head. Clear placement of drums, depth to backing vocals, and real height, which I rarely hear from any IEM.
Design and tech — A CNC-machined 6061 aluminium shell, a 16K resin chamber, a hand-painted reactor core finish and a sapphire glass faceplate with gold-plated accents. Hefty and premium, and it locks into the ear surprisingly well. Seven drivers per side with a five-way crossover (per the maker: 10mm PU/LCP plus 6mm PEEK coaxial dynamic, 8mm DLC dynamic, dual micro planars, dual EST). The cable is four strands of gold, silver, copper and palladium alloy with CNC aluminium hardware, has no memory and is one of my favourites. A solid leather case and a plate of tips come in the box.
Steel Heart vs LUXEAR Valor (US$3,730) — The Valor costs about 70 per cent more and is one of the best pairs I've heard. Bass on both is mountainous and controlled, and the Steel Heart may edge it on pure depth, likely thanks to its three dynamic drivers. Mids are powerful, natural and precise on both, with vocals a hair more forward on the Valor (a point out, not a preference). The Valor has a tad more micro detail in the treble, and the S in screams is slightly more pronounced but never harsh. Staging is massive on both, and the Valor throws the 3D image out slightly further with a slightly bigger height. The Steel Heart comes damn close for much less.
Cons — They are so resolving that on a cheap phone or dongle with low-res compressed streams they will expose every flaw and sound poor. They want a high-quality source, a worthy DAC and amp and clean tracks. And at US$2,200 only a small share of listeners can afford them.
Honest limits — Supplied by the maker, and I know their chief engineer personally. By ear over a few weeks, with no measurements. An unfair comparison against a rival well above its price. I did not describe overall tonal balance in one sentence, so the Tone position is tentative.
- EasyGlasser
- Die Living (Back Road version)Illenium, David Guetta, Dustin Lynch
- Sargon's RageFraser Edwards
- Sweet Dream FanfareJethro Tull
- Health Over GoldLet Babylon Burn
- Driver Configuration
- Tribrid, 7 drivers per side, 5-way crossover
- Driver Details
- 10mm PU/LCP + 6mm PEEK coaxial dynamic, 8mm DLC dynamic, dual micro planars, dual EST (maker)
- Build Materials
- CNC 6061 aluminium shell, 16K resin chamber, sapphire glass faceplate, hand-painted finish
- Cable Connectors
- 1.2m four-strand gold/silver/copper/palladium cable, 4.4mm balanced, 0.78mm 2-pin
- Power Requirements
- 14.5 ohm, 102dB/mW at 1kHz; wants a good DAC and amp
- Accessories
- Leather case, nine pairs of tips and tip plate, cable (maker)
- Build Quality Notes
- US$2,200. Frequency response 5Hz to 40kHz (maker). Photos: Palavox.
A seven-driver reactor core with a holographic wall of sound: deep, fast, controlled bass, a vast stage with real height and hyper-detail without sibilance. It comes very close to a rival about 70 per cent dearer, and it needs a good source.
<p><strong>Buy it if</strong>… you value top-tier technical performance and have the budget; you want a piece of audio art that looks like it runs on dark matter; or you have a high-quality source, a worthy DAC and amp and clean tracks.</p><p><strong>Skip it if</strong>… you'll mostly listen from a cheap phone or dongle or on low-res compressed streams; US$2,200 is out of reach; or you want the very widest image and a little more top-end detail (the Valor edges it).</p>