Sennheiser CX 400BT vs Technics EAH-AZ100: which should you buy?

On aggregated review scores the Technics EAH-AZ100 comes out ahead with a HearWiki score of 86. The full breakdown - sub-scores, specs and what reviewers actually said - is below.

Our pick: Technics EAH-AZ100 - Outstanding overall at around $250.

True Wireless

Sennheiser CX 400BT

59Average

$210

Full review data

True Wireless

Score breakdown

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

Technics EAH-AZ100 leads on 6 of 7 measures.

Sennheiser CX 400BT
Technics EAH-AZ100

HearWiki score

Sound

7.9

9.2

Noise cancelling

8.6

Battery

5.5

8.7

Calls

6.0

7.8

Value

2.0

8.1

Price (USD)

$210

$250

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?

New platform

Technics EAH-AZ100 (2025) against Sennheiser CX 400BT (2021). The Technics EAH-AZ100 is the newer platform here: Bluetooth 5.3 against 5.1, Top codec LC3 against aptX, LE Audio (LC3) and ANC type Hybrid against None. It also adds Multipoint pairing, Wireless charging and Water resistance (IPX4).

CX 400BT2021
EAH-AZ10020254 yr newer

What differsCX 400BTEAH-AZ100

Bluetooth: 5.1; 5.3
Top codec: aptX; LC3
LE Audio (LC3): No; Yes
ANC type: None; Hybrid
Multipoint pairing: No; Yes
Wireless charging: No; Yes
Water resistance: Not rated; IPX4

Level on: USB-C, Transparency mode, Custom EQ, Companion app.

Specifications

CX 400BTEAH-AZ100

Type: True Wireless; True Wireless
Price (USD): $210; $250
HearWiki score: 59; 86
Released: 2021; 2025
Availability: Still sold new; Sold new
Driver: 7 mm dynamic; 10 mm dynamic
Driver type: dynamic; dynamic
Driver size: 7 mm; 10 mm
Drivers per side: 1; 1
Frequency response: 5 Hz - 21 kHz; 20 Hz - 40 kHz
Impedance: 28 Ω; 16 Ω
Sensitivity: 107 dB/mW; -
Bluetooth: 5.1; 5.3
Codecs: SBC, AAC, aptX; SBC, AAC, LC3, LDAC
Multipoint pairing: No; Yes
Wireless range: -; 10 m
Battery life: 7 h; 12 h
Battery life (ANC on): -; 10 h
Battery incl. case: 20 h; 28 h
Full charge time: 90 min; 120 min
Quick charge: 10 min → 1 h; 15 min → 1.2 h
Wireless charging: No; Yes
Active noise cancelling: No; Yes
ANC type: -; hybrid
Transparency mode: Yes; Yes
Companion app: Yes; Yes
Custom EQ: Yes; Yes
Wear detection: -; Yes
Controls: touch; touch
Voice assistant: Yes; Yes
Weight: 6 g; 11.8 g
Case weight: 37 g; 42 g
Water resistance: none; IPX4
Detachable cable: No; -
USB-C: Yes; Yes
Pad material: silicone; -
Connector: USB-C; -
Balanced connection: No; -
Microphones: 2; 2
Microphone type: -; MEMS

Specification comparison of Sennheiser CX 400BT vs Technics EAH-AZ100
Spec	Sennheiser CX 400BT	Technics EAH-AZ100
Type	True Wireless	True Wireless
Price (USD)	$210	$250
HearWiki score	59 / 100 Average	86 / 100 Outstanding
Released	2021	2025
Audio
Driver	7 mm dynamic	10 mm dynamic
Driver type	dynamic	dynamic
Driver size	7 mm	10 mm
Drivers per side	1	1
Frequency response	5 Hz - 21 kHz	20 Hz - 40 kHz
Impedance	28 Ω	16 Ω
Sensitivity	107 dB/mW	-
Wireless
Bluetooth	5.1	5.3
Codecs	SBC, AAC, aptX	SBC, AAC, LC3, LDAC
Multipoint pairing	No	Yes
Wireless range	-	10 m
Battery
Battery life	7 h	12 h
Battery life (ANC on)	-	10 h
Battery incl. case	20 h	28 h
Full charge time	90 min	120 min
Quick charge	10 min → 1 h	15 min → 1.2 h
Wireless charging	No	Yes
Features
Active noise cancelling	No	Yes
ANC type	-	hybrid
Transparency mode	Yes	Yes
Companion app	Yes	Yes
Custom EQ	Yes	Yes
Wear detection	-	Yes
Controls	touch	touch
Voice assistant	Yes	Yes
Design
Weight	6 g	11.8 g
Case weight	37 g	42 g
Water resistance	none	IPX4
Detachable cable	No	-
USB-C	Yes	Yes
Pad material	silicone	-
Connector	USB-C	-
Balanced connection	No	-
Calls
Microphones	2	2
Microphone type	-	MEMS

What reviewers said

Sennheiser CX 400BT

The Sennheiser CX 400BT deliver a warm, detailed sound signature that punches well above their current price, making them a strong pick for audio-focused listeners. They offer solid battery life, good call quality, and broad codec support, though their chunky design and lack of premium features like ANC or water resistance keep them from being a complete package. With a simple feature set and comfortable fit, they're best for those who prioritize sound over extras.

Pro:Excellent, warm sound quality
Pro:Good battery life with charging case
Pro:Reliable Bluetooth 5.1 with aptX support

Con:Bulky, less compact design
Con:No active noise cancellation
Con:No water or splash resistance

Technics EAH-AZ100

The Technics EAH-AZ100 are premium true wireless earbuds that deliver rich, detailed sound through a 10mm dynamic driver, with support for high-resolution LDAC streaming. They combine effective hybrid active noise cancellation with a comfortable, IPX4-rated design, plus smart features like multipoint pairing and wireless charging for versatile daily use. With up to 12 hours of playtime on a single charge, they are built to last through long listening sessions.

Pro:Excellent sound quality with LDAC support
Pro:Strong hybrid ANC and transparency modes
Pro:Long battery life with wireless charging case

Con:Premium price point
Con:Touch controls may be overly sensitive
Con:No aptX codec support

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

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