Products
Sennheiser CX 400BT True Wireless
Sennheiser CX True Wireless
Tested using Methodology v1.5
Updated Jan 15, 2024 08:40 PM
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Tested using Methodology v1.5
Updated Jan 15, 2024 08:49 PM
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TypeIn-ear
EnclosureClosed-Back
WirelessTruly Wireless
TransducerDynamic
Noise CancellingNo
MicYes
TypeIn-ear
EnclosureClosed-Back
WirelessTruly Wireless
TransducerDynamic
Noise CancellingNo
MicYes
Our Verdict
Sennheiser CX 400BT True Wireless
Sennheiser CX True Wireless
The Sennheiser CX True Wireless are better than the Sennheiser CX 400BT True Wireless for most uses, though the two pairs of headphones are similar overall. The CX have longer battery life and an auto-off timer to help conserve power when not in use. Their companion app also has a slightly wider range of configuration options. Conversely, the CX 400BT offer better microphone recording quality.
Variants
- CX 400BT True Wireless (Black)
- CX 400BT True Wireless (White)
- CX (Black)
- CX (White)
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Black
CX 400BT True Wireless
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Black
CX
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White
CX 400BT True Wireless
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White
CX
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Main Differences for
Neutral Sound
Neutral Sound
Threshold
Neutral Sound
7.0
6.7
Bass Accuracy
8.4
7.2
Mid Accuracy
8.8
8.0
Treble Accuracy
5.5
6.6
Full Comparison
Design
Style
Design Picture 2
Type
In-ear
In-ear
Enclosure
Closed-Back
Closed-Back
Wireless
Truly Wireless
Truly Wireless
Transducer
Dynamic
Dynamic
Comfort
6.5
6.5
Comfort Picture
Weight
0.03 lbs
0.03 lbs
Clamping Force
0 lbs
0 lbs
Controls
6.9
6.8
Controls Picture
OS Compatibility
Not OS specific
Not OS specific
Ease Of Use
Good
Good
Feedback
Great
Good
Call/Music Control
Yes
Yes
Volume Control
Yes
Yes
Microphone Control
No
No
Channel Mixing
No
No
Noise Cancelling Control
No
No
Talk-Through
No
No
Additional Controls
Voice Assistant
Voice Assistant
Breathability
9.2
9.2
Breathability After Picture
Avg.Temp.Difference
0.8 °C
0.8 °C
Portability
9.3
9.3
Portability Picture
L
1.2" (3.0 cm)
1.4" (3.5 cm)
W
1.4" (3.6 cm)
1.2" (3.1 cm)
H
1.2" (3.0 cm)
1.2" (3.0 cm)
Volume
2.10 in³ (34.41 cm³)
1.96 in³ (32.20 cm³)
Transmitter Required
No
No
Case
7.5
7.5
Case Picture
Type
Hard case
Hard case
L
2.3" (5.8 cm)
1.3" (3.3 cm)
W
1.3" (3.3 cm)
2.3" (5.9 cm)
H
1.7" (4.3 cm)
1.7" (4.2 cm)
Volume
4.90 in³ (80.30 cm³)
5.01 in³ (82.10 cm³)
Build Quality
8.0
8.0
Build Quality Picture
Stability
7.5
7.5
Stability Picture
Headshots 1
Angled Picture
Side Picture
Headshots 2
Front Picture
Rear Picture
Top
Top Picture
In The Box
In The Box Picture
Sound
Sound Profile
Frequency Response
Bass Amount
-0.41 dB
2.49 dB
Treble Amount
-2.19 dB
-3.27 dB
Frequency Response Consistency
8.8
9.2
Consistency L
Consistency R
Avg. Std. Deviation
0.24 dB
0.17 dB
Bass Accuracy
8.4
7.2
Bass
Std. Err.
2.12 dB
4.38 dB
Low-Frequency Extension
35.64 Hz
10 Hz
Low-Bass
-3.68 dB
2.5 dB
Mid-Bass
-0.08 dB
4.9 dB
High-Bass
2.13 dB
6 dB
Mid Accuracy
8.8
8.0
Std. Err.
1.64 dB
2.64 dB
Low-Mid
0.85 dB
4.06 dB
Mid-Mid
-2.21 dB
0.01 dB
High-Mid
-0.1 dB
0.18 dB
Treble Accuracy
5.5
6.6
Treble
Std. Err.
6.42 dB
5.02 dB
Low-Treble
-7.48 dB
-5.35 dB
Mid-Treble
-0.17 dB
-0.06 dB
High-Treble
-3.8 dB
-2.62 dB
Peaks/Dips
7.0
7.4
Peaks/Dips Graph
Peaks
1.8 dB
1.58 dB
Dips
2.13 dB
1.68 dB
Imaging
9.2
9.3
Group Delay
Phase Response Mismatch
Weighted Group Delay
0.12
0.13
Weighted Phase Mismatch
1.48
2.14
Weighted Amplitude Mismatch
0.47
0.28
Weighted Frequency Mismatch
1.19
1.11
Passive Soundstage
0.8
0.9
PRTF
PRTF Accuracy (Std. Dev.)
N/A
N/A
PRTF Size (Avg.)
N/A
N/A
PRTF Distance
N/A
N/A
Openness
3.4
3.5
Acoustic Space Excitation
0.3
0.5
Virtual Soundstage
0.0
0.0
Virtual Soundstage
Head Modeling
No
No
Speaker Modeling
No
No
Room Ambience
No
No
Head Tracking
No
No
Virtual Surround
No
No
Weighted Harmonic Distortion
8.3
7.7
Weighted Harmonic Distortion
WHD @ 90
0.151
0.325
WHD @ 100
0.083
0.122
Test Settings
Firmware
2.13.0
1.6.8
Power
On
On
Connection
Bluetooth 5.0
Bluetooth 5.0
Codec
aptX, 16-bit, 48kHz
aptX, 16-bit, 48kHz
EQ
Neutral
Neutral
ANC
No ANC
No ANC
Tip/Pad
Silicone (small)
Silicone (small)
Microphone
Integrated
Integrated
Isolation
Noise Isolation
6.1
6.5
Noise Isolation
Isolation Audio
Overall Attenuation
-17.41 dB
-18.46 dB
Noise Cancelling
No
No
Bass
-4.07 dB
-5.22 dB
Mid
-16.41 dB
-18.11 dB
Treble
-32.91 dB
-33.29 dB
Leakage
9.8
9.6
Leakage
Leakage Audio
Overall Leakage @ 1ft
22.41 dB
23.61 dB
Microphone
Microphone Style
Integrated
Yes
Yes
In-Line
No
No
Boom
No
No
Detachable Boom
No
No
Mic
Yes
Yes
Recording Quality
7.0
5.4
Microphone Frequency Response
Recorded Speech
LFE
261.43 Hz
334.17 Hz
FR Std. Dev.
3.1 dB
4 dB
HFE
5,424.45 Hz
2,248 Hz
Weighted THD
1.24
10.521
Gain
6.76 dB
20.22 dB
Noise Handling
5.8
7.1
SpNR
SpNR
18.69 dB
35.42 dB
Noise Gate
No
Always On
Speech + Pink Noise Handling
6.0
7.5
Speech + Pink Noise Audio Sample
Speech + Subway Noise Handling
5.5
6.5
Speech + Subway Noise Audio Sample
Active Features
Battery
5.3
7.2
Battery Type
Rechargable
Rechargable
Continuous Battery Life
5 hrs
6.6 hrs
Additional Charges
1.9
2.0
Total Battery Life
14.5 hrs
19.8 hrs
Charge Time
1.5 hrs
1.1 hrs
Power-Saving Feature
No
Auto-Off Timer
Audio While Charging
No
Yes
Passive Playback
No
No
Charging Port
USB-C
USB-C
App Support
7.0
7.5
App Picture
App Name
Sennheiser Smart Control
Sennheiser Smart Control
iOS
Yes
Yes
Android
Yes
Yes
macOS
No
No
Windows
No
No
Equalizer
Graphic + Presets
Graphic + Presets
ANC Control
No
No
Mic Control
No
No
Room Effects
No
No
Playback Control
No
No
Button Mapping
Yes
Yes
Surround Support
No
No
Connectivity
Bluetooth
6.4
7.0
Bluetooth Version
5.1
5.2
Multi-Device Pairing
No
No
NFC Pairing
No
No
Line Of Sight Range
140.00 ft (42.67 m)
226.38 ft (69.00 m)
PC Latency (SBC)
335 ms
377 ms
PC Latency (aptX)
322 ms
321 ms
PC Latency (aptX HD)
N/A
N/A
PC Latency (aptX-LL)
N/A
N/A
iOS Latency
-112 ms
36 ms
Android Latency
-120 ms
23 ms
Non-Bluetooth Wireless
0.0
0.0
Non-BT Line Of Sight Range
N/A
N/A
Non-BT Latency
N/A
N/A
Wired
0.0
0.0
Cable Picture
Analog Audio
No
No
USB Audio
No
No
Detachable
No
No
Length
N/A
N/A
Connection
No Wired Option
No Wired Option
Analog/USB Audio Latency
N/A
N/A
PC Compatibility
Analog
No
No
Wired USB
No
No
Non-BT Wireless
No
No
PlayStation Compatibility
PS4 Analog
No
No
PS4 Wired USB
No
No
PS4 Non-BT Wireless
No
No
PS5 Analog
No
No
PS5 Wired USB
No
No
PS5 Non-BT Wireless
No
No
Xbox Compatibility
Xbox One Analog
No
No
Xbox One Wired USB
No
No
Xbox One Non-BT Wireless
No
No
Xbox Series X|S Analog
No
No
Xbox Series X|S Wired USB
No
No
Xbox Series X|S Non-BT Wireless
No
No
Base/Dock
2.2
2.2
Type
Charging Case
Charging Case
USB Input
No
No
Line In
No
No
Line Out
No
No
Optical Input
No
No
RCA Input
No
No
Dock Charging
Yes
Yes
Power Supply
USB-C
USB-C
Check Price
Black
CX 400BT True Wireless
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Black
CX
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White
CX 400BT True Wireless
SEE PRICE
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White
CX
SEE PRICE
Amazon.com
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