Short answer: the Sennheiser HDB 630. Both are rated 3.3/5 for sound quality (#285 and #291 of 481 over-ear headphones), and the Sennheiser HDB 630 costs $489.95 against $499.99 for the Dan Clark Audio Aeon RT Closed, and with sound quality even, the cheaper one is the better buy.
The case for the Dan Clark Audio Aeon RT Closed: A light 0.7 lbs (328 g) closed-back planar with a neutral bass level (within 0.1 dB of target) and a Harman score of 66, sold by Dan Clark Audio for much less than its flagships. The tradeoff: Treble sits about 2.9 dB below target, so it can sound a little dull next to brighter headphones, and it measures behind the older Dan Clark Audio Aeon Flow Closed (79).
The case for the Sennheiser HDB 630: Bass sits close to target and holds down to 20 Hz, so low end sounds full without bloat. Watch for: Treble sits about 4.5 dB low, so it sounds a little dark.
Buy the Sennheiser HDB 630. Both are rated the same for sound quality, and it costs $10.04 less than the Dan Clark Audio Aeon RT Closed.
Still deciding? The full Headphones rankings cover every ranked option.
A light 328 g closed-back planar with a neutral bass level (within 0.1 dB of target) and a Harman score of 66, sold by Dan Clark Audio for much less than its flagships.
Dan Clark Audio $499.99 eBay
Bass sits close to target and holds down to 20 Hz, so low end sounds full without bloat.
Amazon $489.95 eBayPrices on this page were last checked October 16, 2026 at 5:46 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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Specifications Side By Side
| Dan Clark Audio Aeon RT Closed | Sennheiser HDB 630 | |
|---|---|---|
| Price | $499.99 | $489.95 |
| Ranked | #291 of 481 in Over-Ear Headphones | #285 of 481 in Over-Ear Headphones |
| Form Factor | Over-ear | Over-ear |
| Back | Closed | Closed |
| Connection | Wired | Bluetooth |
| Driver Type | Planar magnetic | Dynamic |
| Impedance | 13 ohms | - |
| Sensitivity | About 90 dB/mW | - |
| Weight | 0.7 lbs (328 g) | 0.7 lbs (311 g) |
| Harman Preference Score | 66 (measured by oratory1990, via AutoEQ) | 67 (median of 7 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.54 dB standard deviation | 2.37 dB standard deviation |
| Tonal Tilt | -1.06 (negative is warmer, positive brighter) | -1.11 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-1.9 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+2.6 dB at 30 Hz) |
| Drivers | - | 1 x 42mm dynamic |
| Frequency Response | - | 6Hz - 40kHz |
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