FiiO FA9 In-Ear Monitors vs HarmonicDyne P.D.1

Every tracked fact about the two, side by side - prices, history lows, ratings and measured tuning. No verdict: which one to buy is the visitor's decision, always.

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Open head-to-head

FiiO FA9 In-Ear Monitors (Apos Certified) - Black FiiO Out of stock at every tracked store Lowest on record ₹35,400 on Thursday, 22nd Oct, 2026 ★★★★★ 5.0 5.0 · 1 reviews Full prices & history

HarmonicDyne P.D.1 Planar Driver HiFi In-Ear Earphones IEMs harmonicdyne Now ₹18,963 at HiFiGo Lowest on record ₹18,823 on Thursday, 22nd Oct, 2026 Full prices & history

What is being compared

Both sides are in-ear monitors. The rows below are the facts each store publishes for this shelf - driver arrangement, impedance, sensitivity, plug and connectivity. A dash means the listing does not state that spec.

Spec FiiO harmonicdyne

Driver configuration — Planar

Driver setup — Planar

Impedance — 16Ω

Sensitivity — 110dB

Connectivity Wired Wired

Connector — MMCX

Plug 3.5mm —

Measured tuning, side by side

Both curves are real community measurements (gold: FiiO · ink: harmonicdyne). Each is level-aligned to its own 200 Hz–1 kHz mean, so rig offsets don't skew the comparison.

FiiO harmonicdyne

Tuning distance ±4.86 dB RMS 71% match - Close. Computed on a shared 40-point log grid, 20 Hz–10 kHz. A measurement-space fact, not a promise two ears agree.

Bass · 20–250 Hz FiiO −4.5 dB Average level difference in this band, both curves aligned to their own 200 Hz–1 kHz mean. Plus means FiiO plays louder there on the measured files; minus means harmonicdyne does.

Mids · 250–2,000 Hz FiiO −0.4 dB Average level difference in this band, both curves aligned to their own 200 Hz–1 kHz mean. Plus means FiiO plays louder there on the measured files; minus means harmonicdyne does.

Treble · 2,000–10,000 Hz FiiO −2.9 dB Average level difference in this band, both curves aligned to their own 200 Hz–1 kHz mean. Plus means FiiO plays louder there on the measured files; minus means harmonicdyne does.

What a curve cannot seeBuild, driver QC unit-to-unit, comfort, isolation, accessories, warranty and resale value sit outside the graph - usually what the pricier one is charging for.

Price over the last 30 days

Daily lowest price across every tracked store, from the site's own price history. The line is one product's own range - the two cards are not drawn to a shared scale.

FiiO FA9 In-Ear Monitors (Apos Certified) - Black No tracked offer in stock In stock at 0 tracked stores

HarmonicDyne P.D.1 Planar Driver HiFi In-Ear Earphones IEMs Now ₹18,963 47% below its 30-day median Lowest on record ₹18,823 on Thursday, 22nd Oct, 2026 In stock at 1 tracked store

Price gap right now n/a Both sides need a tracked offer to compare.

Stores with it in stock 0 vs 1 Active stores carrying each one right now - more stores usually means easier replacement and a steadier price.

The decision, factually

Cheaper right now HarmonicDyne P.D.1 Planar Driver HiFi In-Ear Earphones IEMs Lowest current price across all tracked stores.

Deepest discount ever seen HarmonicDyne P.D.1 Planar Driver HiFi In-Ear Earphones IEMs From each product's own recorded price history.

This page reports facts and expresses no opinion on which to purchase.

Keep going

EQ preset: FiiO EQ preset: harmonicdyne All IEMs More comparisons