Fosi Audio i5 Open-Back vs STAX SR-L500 MKII

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

Fosi Audio i5 Open-Back Planar Magnetic Headphones fosi Now ₹52,040 at Bloom Audio Lowest on record ₹550 on Thursday, 5th Nov, 2026 ★★★★★ 4.9 4.9 · 74 reviews Full prices & history

STAX SR-L500 MKII Electrostatic Earspeaker Headphone stax Now ₹69,999 at Headphone Zone At its lowest recorded price ★★★★★ 5.0 5.0 · 2 reviews Full prices & history

What is being compared

Both sides are headphones. The rows below are the facts each store publishes for this shelf - driver setup, impedance, sensitivity, back design and connectivity. A dash means the listing does not state that spec.

Spec fosi stax

Driver configuration Planar magnetic Electrostatic

Sensitivity — 101dB

Connectivity Wired Wired

Back design Open-back —

Measured tuning, side by side

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

fosi stax

Average level per band, relative to that curve's own 200 Hz–1 kHz middle - a taller bar plays louder there on the measured files. Same colours as the chart above.

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Hear them side by side

Signal A B

Hear A Hear B

Your earphones / headphones

Wearing your own earphones or headphones? Pick them here and the player pre-corrects for their sound, so the demo plays the target tuning itself - not both mixed together.

Same signal through both tunings at once - slide to blend. Start on pink noise for the clearest read.

Tuning distance ±2.91 dB RMS 83% 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 fosi +0.7 dB Average level difference in this band, both curves aligned to their own 200 Hz–1 kHz mean. Plus means fosi plays louder there on the measured files; minus means stax does.

Mids · 250–2,000 Hz fosi −0.8 dB Average level difference in this band, both curves aligned to their own 200 Hz–1 kHz mean. Plus means fosi plays louder there on the measured files; minus means stax does.

Treble · 2,000–10,000 Hz fosi −1.3 dB Average level difference in this band, both curves aligned to their own 200 Hz–1 kHz mean. Plus means fosi plays louder there on the measured files; minus means stax 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.

Fosi Audio i5 Open-Back Planar Magnetic Headphones Now ₹52,040 at its 30-day median Lowest on record ₹550 on Thursday, 5th Nov, 2026 In stock at 3 tracked stores

STAX SR-L500 MKII Electrostatic Earspeaker Headphone Now ₹69,999 at its 30-day median Lowest on record ₹69,999 on Saturday, 12th Sept, 2026 In stock at 1 tracked store

Price gap right now ₹17,959 26% of the dearer one's price.

Stores with it in stock 3 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 Fosi Audio i5 Open-Back Planar Magnetic Headphones Lowest current price across all tracked stores - ₹52,040 vs ₹69,999.

Deepest discount ever seen Fosi Audio i5 Open-Back Planar Magnetic Headphones From each product's own recorded price history.

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

Keep going

EQ preset: fosi EQ preset: stax All Headphones More comparisons