Dan Clark Audio Aeon Closed X vs Sennheiser HDB 630: which should you buy?

On aggregated review scores the Sennheiser HDB 630 comes out ahead with a HearWiki score of 86. The full breakdown - sub-scores, specs and what reviewers actually said - is below.

Our pick: Sennheiser HDB 630 - Outstanding overall at around $450.

Over-Ear

Score breakdown

Each axis is a 0–10 blend of what reviewers scored, not a lab measurement.

Sennheiser HDB 630 leads on 7 of 7 measures.

Dan Clark Audio Aeon Closed X
Sennheiser HDB 630

HearWiki score

Sound

7.8

9.4

Noise cancelling

8.2

Battery

9.7

Calls

8.5

Value

8.4

Price (USD)

$680

$450

Generation & platform

The scores rank quality. This is the other question: is the newer one actually newer technology, or the same platform in a new shell?

Half a step newer

Sennheiser HDB 630 (2025) against Dan Clark Audio Aeon Closed X (2020). The Sennheiser HDB 630 edges ahead on platform, but only just: ANC type Adaptive against None. It also adds USB-C, Wear detection, Transparency mode and Custom EQ.

Aeon Closed X2020
HDB 63020255 yr newer

What differsAeon Closed XHDB 630

ANC type: None; Adaptive
USB-C: No; Yes
Wear detection: No; Yes
Transparency mode: No; Yes
Custom EQ: No; Yes
Companion app: No; Yes

Specifications

Aeon Closed XHDB 630

Type: Over-Ear; Over-Ear
Price (USD): $680; $450
HearWiki score: 65; 86
Released: 2020; 2025
Availability: Discontinued; Sold new
Driver: 62 mm planar magnetic; 42 mm dynamic
Driver type: planar; dynamic
Driver size: 62 mm; 42 mm
Drivers per side: 1; 1
Frequency response: 20 Hz - 20 kHz; 6 Hz - 40 kHz
Sound signature: -; neutral
Impedance: 14 Ω; 480 Ω
Sensitivity: 91 dB/mW; 105 dB/mW
Bluetooth: -; 5.2
Codecs: -; SBC, AAC, aptX, aptX HD, aptX Adaptive
Multipoint pairing: -; Yes
Battery life: -; 60 h
Battery life (ANC on): -; 60 h
Full charge time: -; 120 min
Quick charge: -; 10 min → 7 h
Wireless charging: -; No
Active noise cancelling: No; Yes
ANC type: none; adaptive
Transparency mode: No; Yes
Companion app: No; Yes
Custom EQ: No; Yes
Wear detection: No; Yes
Controls: none; touch
Voice assistant: -; Yes
Weight: 342 g; 311 g
Water resistance: -; none
Foldable: No; -
Detachable cable: Yes; Yes
USB-C: No; Yes
Connector: -; 3.5 mm
Microphones: -; 4

Specification comparison of Dan Clark Audio Aeon Closed X vs Sennheiser HDB 630
Spec	Dan Clark Audio Aeon Closed X	Sennheiser HDB 630
Type	Over-Ear	Over-Ear
Price (USD)	$680	$450
HearWiki score	65 / 100 Good	86 / 100 Outstanding
Released	2020	2025
Audio
Driver	62 mm planar magnetic	42 mm dynamic
Driver type	planar	dynamic
Driver size	62 mm	42 mm
Drivers per side	1	1
Frequency response	20 Hz - 20 kHz	6 Hz - 40 kHz
Sound signature	-	neutral
Impedance	14 Ω	480 Ω
Sensitivity	91 dB/mW	105 dB/mW
Wireless
Bluetooth	-	5.2
Codecs	-	SBC, AAC, aptX, aptX HD, aptX Adaptive
Multipoint pairing	-	Yes
Battery
Battery life	-	60 h
Battery life (ANC on)	-	60 h
Full charge time	-	120 min
Quick charge	-	10 min → 7 h
Wireless charging	-	No
Features
Active noise cancelling	No	Yes
ANC type	none	adaptive
Transparency mode	No	Yes
Companion app	No	Yes
Custom EQ	No	Yes
Wear detection	No	Yes
Controls	none	touch
Voice assistant	-	Yes
Design
Weight	342 g	311 g
Water resistance	-	none
Foldable	No	-
Detachable cable	Yes	Yes
USB-C	No	Yes
Connector	-	3.5 mm
Calls
Microphones	-	4

What reviewers said

Dan Clark Audio Aeon Closed X

The Dan Clark Audio Aeon Closed X is a wired, closed-back planar magnetic headphone that delivers a neutral-leaning sound with clear mids, punchy bass, and deep extension. It stands out for its light weight and spacious soundstage for a closed design, though it can sound sharp in the treble without its damping inserts and benefits from a capable amplifier for best performance.

Pro:Lightweight for a planar magnetic design
Pro:Neutral, detailed sound with clear mids and punchy bass
Pro:Unusually spacious soundstage for closed-back headphones

Con:Treble can be sharp without included damping inserts
Con:Damping inserts reduce dynamics when used
Con:Benefits from ample amplifier current despite low impedance

Sennheiser HDB 630

The Sennheiser HDB 630 is a premium wireless over-ear headphone that prioritizes audio fidelity above all else, pairing a detailed 42 mm driver with adaptive noise cancellation and extensive aptX codec support. Its standout feature is the bundled BTD 700 dongle, which unlocks high-resolution wireless performance, while a long 60-hour battery life and comfortable fit make it suitable for extended listening sessions. Though it lacks water resistance and wireless charging, its balanced tuning and engaging sound make it a top choice for audiophiles on the go.

Pro:Excellent, balanced sound quality
Pro:Adaptive ANC with strong performance
Pro:Support for aptX Adaptive and aptX HD

Con:No water resistance
Con:No wireless charging
Con:Some noticeable sonic quirks in certain settings

Summaries are AI-condensed and paraphrased from published reviews and specs - not original hands-on testing. More on our method.

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