Anker Soundcore Space A40 Truly Wireless vs OnePlus Buds 4: Which Headphones Are Better?

Tested using Methodology v2.2

Updated May 11, 2026 06:25 PM

This review is in Early access

See Anker Soundcore Space A40 Truly Wireless Review

Anker Soundcore Space A40 Truly Wireless Picture

TypeIn-ear

Noise CancellingYes

EnclosureClosed-Back

Bass Amount Slightly Emphasized (1 dB)

WirelessTruly Wireless

Treble Amount Underemphasized (-5 dB)

MicYes

Sound Signature Warm

TypeIn-ear

Noise CancellingYes

EnclosureClosed-Back

Bass Amount Very Emphasized (5 dB)

WirelessTruly Wireless

Treble Amount Balanced (0 dB)

MicYes

Sound Signature Warm

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14

Our Verdict

Anker Soundcore Space A40 Truly Wireless

OnePlus Buds 4

Full comparison details regarding individual product score sets can be found in the section below

Variants

Soundcore Space A40 (Black)
Soundcore Space A40 (Blue)

Buds 4 (Storm Gray)
Buds 4 (Zen Green)

Review

See OnePlus Buds 4 Review

Check Price

Black

Soundcore Space A40

Storm Gray

Buds 4

Blue

Soundcore Space A40

Zen Green

Buds 4

BestBuy.com

White

Soundcore Space A40

Main Differences for

Sports And Fitness

Threshold

0.10

Sports And Fitness

0.0

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Full Comparison

Sports And Fitness

0.0

Travel

0.0

Office Work

0.0

Wireless Gaming (In Development)

0.0

Wired Gaming (In Development)

0.0

Audio Reproduction Accuracy

0.0

Noise Isolation

0.0

Microphone (In Development)

0.0

Frequency Response Consistency

0.0

Sound

Sound Profile

SAMPLE

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Normalization Frequency

Lock Hz

Bass Amount

Locked

Treble Amount

Locked

Sound Signature

Locked

Frequency Response Consistency

N/A

Consistency L

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Consistency R

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Std. Deviation

Lock dB

Raw Frequency Response

Raw FR L

SAMPLE

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Raw FR R

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Bass Profile: Target Compliance

N/A

Bass Profile: Target Compliance

SAMPLE

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SAMPLE

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RMS Deviation From Target

Lock dB

Low-Frequency Extension

Lock Hz

Low Bass

Lock dB

Mid Bass

Lock dB

High Bass

Lock dB

Mid-Range Profile: Target Compliance

N/A

Mid-Range Profile: Target Compliance

SAMPLE

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SAMPLE

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RMS Deviation From Target

Lock dB

Low Mid

Lock dB

Mid-Mid

Lock dB

High Mid

Lock dB

Treble Profile: Target Compliance

N/A

Treble Profile: Target Compliance

SAMPLE

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SAMPLE

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RMS Deviation From Target

Lock dB

Low Treble

Lock dB

Mid Treble

Lock dB

High Treble

Lock dB

Peaks/Dips

N/A

Peaks/Dips Graph

SAMPLE

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SAMPLE

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Peaks

Lock dB

Dips

Lock dB

Stereo Mismatch

N/A

Frequency Response Mismatch

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Phase Response Mismatch

SAMPLE

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SAMPLE

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Weighted Amplitude Mismatch

Lock dB

Weighted Frequency Response Mismatch

Lock dB

Weighted Phase Mismatch

Lock°

PRTF

N/A

PRTF

SAMPLE

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SAMPLE

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PRTF Accuracy (RMS Deviation)

N/A

PRTF Size (Avg.)

N/A

PRTF Distance

N/A

Harmonic Distortion

N/A

Harmonics Levels

SAMPLE

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SAMPLE

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THD Ratio

SAMPLE

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WHD @ 94 dB SPL

Lock%

WHD @ 104 dB SPL

Lock%

Electrical Aspects

Impedance

SAMPLE

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SAMPLE

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Sensitivity @1kHz-1V

N/A

Bluetooth Max SPL

Lock dB

Virtual Soundstage

N/A

Virtual Soundstage

SAMPLE

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SAMPLE

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Head Modeling

Locked

Speaker Modeling

Locked

Room Ambience

Locked

Head Tracking

Locked

Virtual Surround

Locked

Test Settings

Firmware

Locked

Power

Locked

Connection

Locked

Codec

Locked

Test Instrument

Locked

EQ

Locked

ANC

Locked

Tip/Pad

Locked

Microphone

Locked

Design

Style

Design Picture 2

SAMPLE

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SAMPLE

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Type

Locked

Enclosure

Locked

Wireless

Locked

Transducer

Locked

Comfort

N/A

Comfort Picture

SAMPLE

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SAMPLE

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Weight

Lock lbs

Clamping Force

Lock lbs

Controls

N/A

Controls Picture

SAMPLE

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SAMPLE

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OS Compatibility

Locked

Ease Of Use

Locked

Feedback

Locked

Call/Music Control

Locked

Volume Control

Locked

Microphone Control

Locked

Channel Mixing

Locked

Noise Cancelling Control

Locked

Talk-Through

Locked

Additional Controls

Locked

Portability

N/A

Portability Picture

SAMPLE

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SAMPLE

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L

Lock" (Lock cm)

W

Lock" (Lock cm)

H

Lock" (Lock cm)

Volume

Lock in³ (Lock cm³)

Transmitter Required

Locked

Case

N/A

Case Picture

SAMPLE

for pictures & test results

SAMPLE

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Type

Locked

L

Lock" (Lock cm)

W

Lock" (Lock cm)

H

Lock" (Lock cm)

Volume

Lock in³ (Lock cm³)

Build Quality

N/A

Build Quality Picture

SAMPLE

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SAMPLE

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Stability

N/A

Stability Picture

SAMPLE

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SAMPLE

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Headshots 1

Angled Picture

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Side Picture

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SAMPLE

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Headshots 2

Front Picture

SAMPLE

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SAMPLE

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Rear Picture

SAMPLE

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SAMPLE

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Top

Top Picture

SAMPLE

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SAMPLE

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In The Box

In The Box Picture

SAMPLE

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SAMPLE

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Isolation

Noise Isolation - Full Range

N/A

Noise Isolation - Full Range Graph

SAMPLE

for pictures & test results

SAMPLE

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Noise Cancelling

Locked

Overall Attenuation

Lock dB

Bass

Lock dB

Mid

Lock dB

Treble

Lock dB

Noise Isolation - Common Scenarios

N/A

Noise Isolation - Common Scenarios Graph

SAMPLE

for pictures & test results

SAMPLE

for pictures & test results

Airplane Noise Attenuation

Lock dB

Airplane Noise Isolation Audio

Office Noise Attenuation

Lock dB

Office Noise Isolation Audio

Street Noise Attenuation

Lock dB

Street Noise Isolation Audio

Noise Isolation - Voice Handling

ANC Wind Handling

ANC Wind Handling Graph

SAMPLE

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SAMPLE

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ANC Wind Noise

Leakage

N/A

Leakage

SAMPLE

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SAMPLE

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Leakage Audio

Overall Leakage @ 1ft

Lock dB

Microphone

Microphone Style

Integrated

Locked

In-Line

Locked

Boom

Locked

Detachable Boom

Locked

Mic

Locked

Recording Quality

N/A

Microphone Frequency Response

SAMPLE

for pictures & test results

SAMPLE

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Recorded Speech

LFE

Lock Hz

FR Std. Dev.

Lock dB

HFE

Lock Hz

Weighted THD

Lock

N/A

Gain

Lock dB

Noise Handling

N/A

SpNR

SAMPLE

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SAMPLE

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SpNR

Lock dB

Noise Gate

Locked

Speech + Pink Noise Handling

0.0

Speech + Pink Noise Audio Sample

Speech + Subway Noise Handling

0.0

Speech + Subway Noise Audio Sample

Active Features

Battery

N/A

Battery Type

Locked

Continuous Battery Life

Lock hrs

Additional Charges

Lock

Total Battery Life

Lock hrs

Charge Time

Lock hrs

Power-Saving Feature

Locked

Audio While Charging

Locked

Passive Playback

Locked

Charging Port

Locked

App Support

N/A

App Picture

SAMPLE

for pictures & test results

SAMPLE

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App Name

Locked

iOS

Locked

Android

Locked

macOS

Locked

Windows

Locked

Equalizer

Locked

ANC Control

Locked

Mic Control

Locked

Room Effects

Locked

Playback Control

Locked

Button Mapping

Locked

Surround Support

Locked

Connectivity

Wired Connection

N/A

Cable Picture

SAMPLE

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SAMPLE

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Analog Audio

Locked

USB Audio

Locked

Detachable

Locked

Length

N/A

Connector

Locked

Latency - Analog

N/A

Latency - USB

N/A

Recorded Latency

Recorded Latency Connection

Locked

Bluetooth Connection

N/A

Bluetooth Version

Locked

Multi-Device Pairing

Locked

Quick Pair (Android)

Locked

Quick Pair (iOS)

Locked

Line Of Sight Range

Lock ft (Lock m)

Latency - SBC

Lock ms

Latency - aptX

N/A

Latency - aptX Adaptive (High Quality)

N/A

Latency - aptX Adaptive (Low Latency)

N/A

Latency - LDAC

Lock ms

N/A

Recorded Latency

Recorded Latency Codec

Locked

AAC Support

Locked

Wireless Connection (Dongle)

N/A

Line Of Sight Range

N/A

Latency - Dongle

N/A

Recorded Latency

PC Compatibility

Analog

Locked

Wired USB

Locked

Non-BT Wireless

Locked

PlayStation Compatibility

PS4 Analog

Locked

PS4 Wired USB

Locked

PS4 Non-BT Wireless

Locked

PS5 Analog

Locked

PS5 Wired USB

Locked

PS5 Non-BT Wireless

Locked

Xbox Compatibility

Xbox One Analog

Locked

Xbox One Wired USB

Locked

Xbox One Non-BT Wireless

Locked

Xbox Series X|S Analog

Locked

Xbox Series X|S Wired USB

Locked

Xbox Series X|S Non-BT Wireless

Locked

Base/Dock

N/A

Type

Locked

USB Input

Locked

Line In

Locked

Line Out

Locked

Optical Input

Locked

RCA Input

Locked

Dock Charging

Locked

Power Supply

Locked

Check Price

Black

Soundcore Space A40

Storm Gray

Buds 4

Blue

Soundcore Space A40

Zen Green

Buds 4

BestBuy.com

White

Soundcore Space A40