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.
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.
SpecSuperlux HD681Sonos Ace Active Noise
Sensitivity98dB—
ConnectivityWired—
Plug3.5mm—
Measured tuning, side by side
Both curves are real community measurements (gold: Superlux HD681 · blue: Sonos Ace Active Noise). Each is level-aligned to its own 200 Hz–1 kHz mean, so rig offsets don't skew the comparison.
Superlux HD681Sonos Ace Active Noise
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.
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±2.46 dB RMS85% match - Very 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 HzSuperlux HD681 −1.1 dBAverage level difference in this band, both curves aligned to their own 200 Hz–1 kHz mean. Plus means Superlux HD681 plays louder there on the measured files; minus means Sonos Ace Active Noise does.
Mids · 250–2,000 HzSuperlux HD681 +0.6 dBAverage level difference in this band, both curves aligned to their own 200 Hz–1 kHz mean. Plus means Superlux HD681 plays louder there on the measured files; minus means Sonos Ace Active Noise does.
Treble · 2,000–10,000 HzSuperlux HD681 −2.3 dBAverage level difference in this band, both curves aligned to their own 200 Hz–1 kHz mean. Plus means Superlux HD681 plays louder there on the measured files; minus means Sonos Ace Active Noise 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.
Superlux HD681Now ₹4,500at its 30-day medianLowest on record ₹3,814 on Wednesday, 4th Nov, 2026In stock at 1 tracked store
Price gap right nown/aBoth sides need a tracked offer to compare.
Stores with it in stock1 vs 0Active stores carrying each one right now - more stores usually means easier replacement and a steadier price.
The decision, factually
Cheaper right nowSuperlux HD681Lowest current price across all tracked stores.
Deepest discount ever seenSonos Ace Active Noise Cancelling Headphones with Lossless Audio - Clearance / Open Box - BlackFrom each product's own recorded price history.
This page reports facts and expresses no opinion on which to purchase.
Pick what this is, write it out, send - it lands in the right inbox and gets read.
The inbox is part of a free account - it keeps spam out and lets an answer reach you. Make one (takes a minute, free forever), then come back: this link sits at the bottom of every page.
Sonos Ace Active Noise Cancelling Headphones with Lossless Audio - Clearance / Open Box - Black
Sonos
Out of stock at every tracked store
Lowest on record ₹229 on Thursday, 5th Nov, 2026
Full prices & history