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Sennheiser CX 3 00 Review | 93 Data compared

Avg. price: ~£25
Form factor: in-ear
Connectivity: wired
Battery life: N/A hours
Active noise cancellation (ANC): no

Sennheiser CX 3 00 review. Compare 93 technical specifications and user reviews to see how it ranks among headphones and if it is worth buying.

5.3

Good

4.5

Poor

8.6

Excellent

0.2
Gaming
Score components:
35.0%
0.0
Audio latency
25.0%
0.0
Low-latency game mode
20.0%
1.0
Can be used as a headset
12.0%
0.0
Noise-canceling microphone
8.0%
0.0
Battery life
2.1
Travel
Score components:
28.0%
1.0
Active noise cancellation (ANC)
24.0%
0.0
Battery life
18.0%
10
Weight
16.0%
0.0
Multipoint support
14.0%
0.0
Ambient sound mode
0.2
Calls
Score components:
28.0%
0.0
Noise-canceling microphone
24.0%
1.0
Can be used as a headset
18.0%
0.0
Multipoint support
16.0%
0.0
Battery life
14.0%
0.0
Companion app
4.0
Workout
Score components:
28.0%
10
Weight
24.0%
1.0
Water resistance
20.0%
4.0
IP rating
16.0%
0.0
Battery life
12.0%
1.0
Can be used as a headset

Best prices in UK

Best rankings

Verdict

The Sennheiser CX 3.00 is a lightweight (12g) in-ear headphone featuring high-quality dynamic drivers with neodymium magnets, delivering a frequency response of 17 Hz to 21,000 Hz and a sound pressure level of 118 dB. Characterised by its sleek, minimalist design and an 18-ohm impedance optimized for portable devices, it includes an elliptical tangle-free cable and a 3.5mm angled jack. Main pros include its powerful, bass-driven stereo sound, effective passive noise isolation, and a comfortable fit provided by four sizes of ear adapters. However, notable cons include the absence of an in-line microphone or remote for calls and mixed feedback regarding long-term cable durability.

Technical Specifications of Sennheiser CX 3 00

Overall score

5.3

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Popularity

What it is: An indicator based on the number of reviews received by the headphones.

When it matters: When you prefer headphones that have already been chosen and reviewed by many other users.

Sound

4.7

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Active noise cancellation (ANC)

What it is: Reduces background noise using active technology

When it matters: When blocking office, travel, or aircraft noise is a priority.

Importance: HIGH

Driver type

What it is: Type of speaker driver technology used

When it matters: When the underlying sound character and driver technology matter to you.

Importance: MEDIUM

dynamic

Driver size

What it is: Diameter of the speaker driver unit

When it matters: When you want extra hardware context behind how the headphones may handle bass weight, scale, or overall presentation.

Importance: MEDIUM

Number of drivers

What it is: Total number of speaker drivers per earcup

When it matters: When multi-driver designs are part of your buying criteria.

Importance: LOW

Lowest frequency

What it is: Lowest audio frequency the headphones can reproduce

When it matters: When deeper bass extension matters for your music or movie listening.

Importance: MEDIUM

Good value: <=10 Hz

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Calls & Controls

2.9

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Noise-canceling microphone

What it is: Built-in microphone reduces background noise during calls

When it matters: When you take calls in busy spaces and want your voice to stay clearer.

Importance: MEDIUM

N/A

Can be used as a headset

What it is: Shows whether the headphones can handle voice chat and calls in addition to normal audio playback.

When it matters: When one pair needs to cover music, calls, meetings, and gaming chat.

Importance: MEDIUM

Number of microphones

What it is: Total number of built-in microphones

When it matters: When call pickup quality and beamforming support matter to you.

Importance: LOW

Good value: >=2

Boom microphone

What it is: Includes detachable boom microphone for voice clarity

When it matters: When you need stronger voice clarity for gaming, streaming, or work calls.

Importance: LOW

N/A

Microphone SNR

What it is: Signal-to-noise ratio of the microphone

When it matters: When call clarity matters and you want your voice picked up more cleanly instead of buried in background hiss.

Importance: LOW

Good value: >80 dB

N/A

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Connectivity

6.2

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Connectivity

What it is: Available connection methods (wired, wireless, Bluetooth, etc.)

When it matters: When the headphones need to match how you listen across wired and wireless devices.

Importance: HIGH

Bluetooth version

What it is: Version of Bluetooth technology supported

When it matters: When wireless stability, efficiency, and feature support matter more than treating Bluetooth as a box-check spec.

Importance: MEDIUM

Good value: >=5.0

N/A

Maximum Bluetooth range

What it is: Maximum wireless operating distance from source device

When it matters: When you move around rooms and want fewer dropouts from your source device.

Importance: LOW

Good value: >=10 m

N/A

Audio latency

What it is: Delay between audio and video in wireless mode

When it matters: When you watch video or play games and need sound to stay in sync.

Importance: HIGH

Good value: <60 ms

N/A

Multipoint support

What it is: Supports simultaneous connections to multiple devices

When it matters: When you switch often between a phone and a laptop during the day.

Importance: MEDIUM

N/A

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Features

2.7

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Ambient sound mode

What it is: Allows external sounds to pass through for awareness

When it matters: When you need to stay aware of traffic, voices, or announcements.

Importance: MEDIUM

N/A

EQ support

What it is: Allows customization of sound profile via equalizer

When it matters: When the stock tuning is not enough and you want to shape bass, mids, or treble to match your taste.

Importance: MEDIUM

Companion app

What it is: Dedicated mobile app for customization and updates

When it matters: When software customization, updates, and extra controls matter.

Importance: MEDIUM

N/A

Adjustable ANC levels

What it is: Allows adjustment of noise cancellation intensity levels

When it matters: When you move between quiet rooms, offices, streets, and public transport and do not want one ANC setting for every situation.

Importance: LOW

Good value: >=4

N/A

Voice assistant support

What it is: Compatible with voice assistants like Siri, Alexa, or Google Assistant

When it matters: When hands-free control is part of your daily routine.

Importance: LOW

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Battery

1.0

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Battery life

What it is: Playback time on a single charge

When it matters: When you commute, travel, or work long shifts and do not want charging breaks to interrupt listening.

Importance: HIGH

Good value: >45 hours

N/A

Battery life with ANC

What it is: Playback time with active noise cancellation enabled

When it matters: When you plan to keep noise cancellation on for most of the day.

Importance: HIGH

Good value: >40 hours

N/A

Charging time

What it is: Time required for a full battery charge

When it matters: When you often need the headphones ready again after short breaks.

Importance: MEDIUM

Good value: <=2 hours

N/A

Quick charge

What it is: Provides quick playback time with short charging period

When it matters: When a short top-up needs to deliver useful playback before you leave.

Importance: MEDIUM

N/A

Battery capacity

What it is: Total energy storage of the internal battery

When it matters: When you are estimating how much battery headroom the design may have before relying only on the official runtime claim.

Importance: MEDIUM

Good value: >=720 mAh

N/A

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Design

8.3

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Brand name

What it is: The manufacturer or brand of the product.

When it matters: When you prefer a specific ecosystem, support network, or design philosophy.

Importance: MEDIUM

Sennheiser

Form factor

What it is: Overall design type of the headphones (over-ear, on-ear, in-ear, etc.)

When it matters: When comfort, portability, and isolation depend on the overall headphone style.

Importance: HIGH

in-ear

Weight

What it is: Total weight of the headphones

When it matters: When long listening sessions make wearing comfort more important.

Importance: MEDIUM

Good value: <150 g

Acoustic design

What it is: Type of acoustic design (open-back, closed-back, semi-open)

When it matters: When you need the right balance of isolation, leakage, and soundstage.

Importance: HIGH

closed-back

Clamp force

What it is: Amount of clamping pressure applied to the head

When it matters: When comfort and fit security matter during long sessions.

Importance: MEDIUM

N/A

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Sennheiser CX 3 00 vs the average headphone

Why is Sennheiser CX 3 00 better than the average headphone?

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94.5% lower weight
Sennheiser CX 3 00 is lighter than the average headphone (12 g vs 218 g). The average pair of headphones weighs 218 g.
What it is: Total weight of the headphones
When it matters: When long listening sessions make wearing comfort more important.
Importance: MEDIUM
Good value: <150 g
Sennheiser CX 3 00 is lighter than the average headphone (12 g vs 218 g). The average pair of headphones weighs 218 g.12 g vs 218 g
Spatial audio support
Sennheiser CX 3 00 supports spatial audio, the average headphone does not. 30.7% of headphones support spatial audio.
What it is: Supports immersive surround sound playback
When it matters: When movies, games, and immersive mixes are part of your listening.
Importance: MEDIUM
Sennheiser CX 3 00 supports spatial audio, the average headphone does not. 30.7% of headphones support spatial audio.
16 dB/mW higher sensitivity
Sennheiser CX 3 00 has a higher sensitivity than the average headphone (118 dB/mW vs 102 dB/mW). The average headphones have sensitivity of 102 dB/mW.
What it is: Sound pressure output level per unit of input power
When it matters: When you plan to use weaker sources like phones, handhelds, or entry-level dongles and still want enough volume.
Importance: MEDIUM
Good value: >=106 dB/mW
Sennheiser CX 3 00 has a higher sensitivity than the average headphone (118 dB/mW vs 102 dB/mW). The average headphones have sensitivity of 102 dB/mW.118 dB/mW vs 102 dB/mW
Direct 3.5 mm plug
Sennheiser CX 3 00 includes a direct 3.5 mm plug, the average headphone does not. 38.8% of headphones have a 3.5 mm male connector.
What it is: Shows whether the headphones end in a built-in 3.5 mm male plug instead of relying on a separate detachable cable.
When it matters: When direct wired compatibility with older devices or adapters matters.
Importance: MEDIUM
Sennheiser CX 3 00 includes a direct 3.5 mm plug, the average headphone does not. 38.8% of headphones have a 3.5 mm male connector.
In-line controls
Sennheiser CX 3 00 includes in-line controls, the average headphone does not. 36.4% of headphones support in-line controls.
What it is: Controls available on in-line remote of wired cable
When it matters: When your wired setup depends on cable-mounted buttons or call controls.
Importance: LOW
Sennheiser CX 3 00 includes in-line controls, the average headphone does not. 36.4% of headphones support in-line controls.
3.6x cheaper
Sennheiser CX 3 00 is cheaper than the average headphone (£25 vs £90).
Sennheiser CX 3 00 is cheaper than the average headphone (£25 vs £90).£25 vs £90
15 dB SPL higher sound pressure level
Sennheiser CX 3 00 has a higher sound pressure level than the average headphone (118 dB SPL vs 103 dB SPL). The average headphones reach a sound pressure level of 103 dB SPL.
What it is: Output loudness level of the headphones, usually measured in dB. It helps compare how loud a model can play under similar conditions.
When it matters: When you need a rough idea of how loud the headphones can get before you pair them with a weaker source.
Importance: LOW
Good value: >=108 dB SPL
Sennheiser CX 3 00 has a higher sound pressure level than the average headphone (118 dB SPL vs 103 dB SPL). The average headphones reach a sound pressure level of 103 dB SPL.118 dB SPL vs 103 dB SPL
2.15x more popular
Sennheiser CX 3 00 is more popular than the average headphone (10.00 vs 4.646).
What it is: An indicator based on the number of reviews received by the headphones.
When it matters: When you prefer headphones that have already been chosen and reviewed by many other users.
Sennheiser CX 3 00 is more popular than the average headphone (10.00 vs 4.646).10 vs 4.65
94.5% lower weight
Sennheiser CX 3 00 is lighter than the average headphone (12 g vs 218 g). The average pair of headphones weighs 218 g.
Spatial audio support
Sennheiser CX 3 00 supports spatial audio, the average headphone does not. 30.7% of headphones support spatial audio.
16 dB/mW higher sensitivity
Sennheiser CX 3 00 has a higher sensitivity than the average headphone (118 dB/mW vs 102 dB/mW). The average headphones have sensitivity of 102 dB/mW.
15 dB SPL higher sound pressure level
Sennheiser CX 3 00 has a higher sound pressure level than the average headphone (118 dB SPL vs 103 dB SPL). The average headphones reach a sound pressure level of 103 dB SPL.
Direct 3.5 mm plug
Sennheiser CX 3 00 includes a direct 3.5 mm plug, the average headphone does not. 38.8% of headphones have a 3.5 mm male connector.
In-line controls
Sennheiser CX 3 00 includes in-line controls, the average headphone does not. 36.4% of headphones support in-line controls.

Calls & Controls

Why is Sennheiser CX 3 00 worse than the average headphone?

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Fixed cable
Sennheiser CX 3 00 has a fixed cable, while the average headphone has a detachable one. 62% of headphones have a detachable cable.
30.1 mm smaller driver size
Sennheiser CX 3 00 has smaller driver size than the average headphone (9.9 mm vs 40 mm). The average headphones use a driver size of 40 mm.
0.2 % higher distortion
Sennheiser CX 3 00 has a higher total harmonic distortion than the average headphone (0.5 % vs 0.3 %). The average headphones have total harmonic distortion of 0.3 %.
Not headset-ready
Sennheiser CX 3 00 is not headset-ready, while the average headphone is. 84.7% of headphones can be used as headsets.
1 fewer microphones
Sennheiser CX 3 00 has fewer microphones than the average headphone (0 vs 1). The average headphones have 1 microphones.
No voice assistant support
Sennheiser CX 3 00 does not support voice assistants, the average headphone does. 60.8% of headphones support voice assistants.
30.1 mm smaller driver size
Sennheiser CX 3 00 has smaller driver size than the average headphone (9.9 mm vs 40 mm). The average headphones use a driver size of 40 mm.
What it is: Diameter of the speaker driver unit
When it matters: When you want extra hardware context behind how the headphones may handle bass weight, scale, or overall presentation.
Importance: MEDIUM
Sennheiser CX 3 00 has smaller driver size than the average headphone (9.9 mm vs 40 mm). The average headphones use a driver size of 40 mm.9.9 mm vs 40 mm
No voice assistant support
Sennheiser CX 3 00 does not support voice assistants, the average headphone does. 60.8% of headphones support voice assistants.
What it is: Compatible with voice assistants like Siri, Alexa, or Google Assistant
When it matters: When hands-free control is part of your daily routine.
Importance: LOW
Sennheiser CX 3 00 does not support voice assistants, the average headphone does. 60.8% of headphones support voice assistants.
Fixed cable
Sennheiser CX 3 00 has a fixed cable, while the average headphone has a detachable one. 62% of headphones have a detachable cable.
What it is: Cable can be removed or replaced
When it matters: When you care about easier cable replacement, simpler storage, or the option to swap to shorter, longer, or upgraded leads.
Importance: MEDIUM
Sennheiser CX 3 00 has a fixed cable, while the average headphone has a detachable one. 62% of headphones have a detachable cable.
Not headset-ready
Sennheiser CX 3 00 is not headset-ready, while the average headphone is. 84.7% of headphones can be used as headsets.
What it is: Shows whether the headphones can handle voice chat and calls in addition to normal audio playback.
When it matters: When one pair needs to cover music, calls, meetings, and gaming chat.
Importance: MEDIUM
Sennheiser CX 3 00 is not headset-ready, while the average headphone is. 84.7% of headphones can be used as headsets.
1 fewer microphones
Sennheiser CX 3 00 has fewer microphones than the average headphone (0 vs 1). The average headphones have 1 microphones.
What it is: Total number of built-in microphones
When it matters: When call pickup quality and beamforming support matter to you.
Importance: LOW
Good value: >=2
Sennheiser CX 3 00 has fewer microphones than the average headphone (0 vs 1). The average headphones have 1 microphones.0 vs 1
0.2 % higher distortion
Sennheiser CX 3 00 has a higher total harmonic distortion than the average headphone (0.5 % vs 0.3 %). The average headphones have total harmonic distortion of 0.3 %.
What it is: Percentage of harmonic distortion in audio output
When it matters: When cleaner sound reproduction matters at louder volumes.
Importance: LOW
Good value: <=1%
Sennheiser CX 3 00 has a higher total harmonic distortion than the average headphone (0.5 % vs 0.3 %). The average headphones have total harmonic distortion of 0.3 %.0.5 % vs 0.3 %

Calls & Controls

Graphic comparison of Sennheiser CX 3 00 and

Attribute category

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Third-party reviews

United Kingdom

United States

(Reviews last updated: June 2026)

What customers like about Sennheiser CX 3 00?

Punchy and powerful bass response suitable for pop and hip-hop
Detailed sound reproduction for the price point
Compact and lightweight design with excellent comfort for long sessions
Elliptical, tangle-resistant cable design
Effective passive noise isolation when a proper seal is achieved
Includes multiple ear tip sizes (XS, S, M, L) and a hard carry case
Low profile L-shaped 3.5mm jack for better durability in pockets

What customers dislike about Sennheiser CX 3 00?

Lack of an in-line microphone or remote controls
Midrange and treble can sometimes lack crispness or feel slightly recessed
Build quality concerns, particularly with cable durability over long-term use
Bass can occasionally become 'muddy' or overpowering on complex tracks
The angled plug may not fit well with certain thick phone cases
Silicone tips may slip out easily if the user is perspiring heavily

Expert reviews

head-fi.org

03/01/2015

Sennheiser CX 3.00 Black In-Ear Canal Headphone - Reviews

Head-Fi reviewers praise the Sennheiser CX 3.00 for its significant design improvements over previous models, highlighting a comfortable, secure fit from angled nozzles and a compact build. Sound-wise, they offer a warm, bass-heavy signature with effective noise isolation, making them suitable for commuting, while the smooth treble prevents fatigue. However, critics note the...Read more

digit.in

01/08/2023

Sennheiser CX 3.00 Review : Small, light, constricted audio - Digit Would you like to compare the sound signature of the CX 3.00 against its predecess...

The Sennheiser CX 3.00Go is a well-built, entry-level earphone offering a significant upgrade over standard in-box options, featuring a warm, bass-driven sound with 18-ohm low resistance for mobile devices. Pros include a lightweight design, high volume levels, and a comfortable fit for casual listening. the review notes cons such as constricted audio that becomes shrill at maximum...Read more

technuovo.com

17/06/2015

Sennheiser CX 3.00 Headphone Review // TechNuovo.com

The Sennheiser CX 3.00 in-ear headphones offer a lightweight, compact design equipped with a 1.2-metre elliptical, tangle-free cable that terminates in a gold-plated 3.5mm jack. In the box, users receive a convenient carrying case and four sizes of ear adapters ranging from XS to L to ensure a snug, secure, and comfortable fit. Priced at around £40 in the UK, these headphones are...Read more

whathifi.com

03/09/2015

Sennheiser CX 3.00 review - What Hi-Fi?

The Sennheiser CX 3.00 wired earbuds are a solid, budget-friendly option tested at £40 that deliver a well-balanced and human sound signature. A major pro highlighted in the review is their good dynamic range, which effectively captures the emotional highs and lows of complex musical pieces. Additionally, the earphones boast accurate timing and a bouncy bass response that tracks...Read more

expertreviews.co.uk

11/02/2015

Sennheiser CX 3.00 review - Expert Reviews

The Sennheiser CX 3.00 budget-friendly, in-ear wired headphones are an upgraded successor to the highly popular CX 300-II line. The updated design features angled resonators that allow the earpieces to rest comfortably inside the ear canal, combined with an oval-shaped, rubberized cable designed to eliminate tangles and microphonic friction noise. Retailing at £45 (including VAT),...Read more

trustedreviews.com

03/11/2014

Sennheiser CX 3.00 Review - Trusted Reviews

The Sennheiser CX 3.00 earphonesGo are lauded for their lightweight, comfortable design and excellent passive noise isolation, making them a strong, user-friendly option for budget-conscious consumers. Key benefits include an angled, secure-fit structure, four included ear-tip sizes, and a durable carrying case. Conversely, the sound profile is heavily biased toward bass, designed...Read more

businesstraveller.com

24/08/2015

Tried and tested - Sennheiser CX 3.00 and CXC 700 headphones

The Business Traveller review of the Sennheiser CX 3.00 noise-blocking ear canal headphones highlights a comfortable fit, three color options, and effective sound isolation, alongside the inclusion of four pairs of ear adapters and a storage box. While praised for an enveloping sound and crisp mid-range, the headphones are limited by overbearing bass that can muffle music and a...Read more

haus.de

07/04/2021

Sennheiser CX 300S In-Ear Headphones Review

The Sennheiser CX 300S is a wired in-ear headphone that secured a close second place in the test due to its exceptional sound quality and superb build, rivaling the performance of the much pricier test winner, the Teufel Move Pro. The earbuds offer an outstanding, spacious audio profile with exceptionally strong mid-ranges and well-balanced frequencies, alongside excellent noise...Read more

roxarmy.com

13/11/2017

Sennheiser CX 3.00 In-Ear Headphones Review - Roxarmy.com

The Sennheiser CX 3.00 earphone review highlights a lightweight, 12-gram pair of in-ear headphones designed exclusively for listening to music. Available in red, white, and black, these earphones feature a 1.2-meter cable and come packaged with a convenient plastic storage case and three extra ear tip sizes. On the positive side, the reviewer praises the device for its excellent...Read more

tweakers.net

05/02/2016

Sennheiser CX 3.00 Red, Black Review - Tweakers

This review highlights the Sennheiser CX 3.00 as a lightweight, comfortable, and well-balanced all-rounder in-ear headphone that provides a safe purchase choice for most everyday listeners. The reviewer notes that the earphones deliver a warm sound signature with excellent mid-tones and minimal cable noise friction when walking or cycling. Key design advantages include a practical...Read more

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