Boult Audio Z40 Review
Affordable true wireless earbuds with 60-hour total playback, Zen environmental noise cancellation, 10mm BoomX drivers, adaptive low-latency gaming and Type-C fast charging.
Boult Audio Z40 Quick Specs
BoomX
Total
5.3
ENC
10 min = 100 min
Latency
SBC
Boult Audio Z40 Overview
The Boult Audio Z40 is a budget-focused true wireless earbud set built around 10mm BoomX technology drivers, Zen environmental noise cancellation and a claimed total playback time of up to 60 hours with the charging case.
The earbuds use Bluetooth 5.3, support AAC and SBC audio codecs, and work with both Android and iOS devices. The official Boult specification page also lists IPX5 water resistance and an AI voice assistant feature.
60-hour total playback, 10mm drivers, Zen ENC, adaptive low-latency mode and USB Type-C fast charging are the main features of the Z40.
Sound: 10mm BoomX Drivers
The Z40 uses 10mm drivers with Boult's BoomX technology. The manufacturer positions these drivers around bass-focused sound and high-fidelity acoustics.
The earbuds support AAC and SBC codecs. This provides compatibility across a broad range of Android and iOS devices, although the actual sound presentation will depend on the phone, source material, fit and listening settings.
Calls: Zen ENC
Boult's Zen Mode Environmental Noise Cancellation is designed to reduce surrounding environmental noise picked up during calls. The official product page describes a quad-microphone setup for ENC.
ENC is intended for clearer voice calls rather than removing surrounding noise from music playback. It should therefore not be confused with active noise cancellation (ANC).
Battery: 60 Hours Total
Boult rates the Z40 for up to 60 hours of total playback with the charging case. Actual runtime varies with volume, codec, call usage and other conditions.
The Type-C fast-charging system is rated at 10 minutes of charging for up to 100 minutes of playback under the manufacturer's stated conditions.
Gaming: Low-Latency Mode
The Z40 includes an adaptive low-latency gaming mode intended to reduce the delay between on-screen action and audio. This can be useful for mobile gaming where timing matters.
The official product page describes the feature as Adaptive Low Latency; exact latency can vary by device, game, wireless conditions and software.
Connectivity & Controls
Bluetooth 5.3 provides the wireless connection, while supported profiles include A2DP, AVRCP, HFP and HSP. The earbuds are compatible with Android and iOS.
The Z40 also supports touch controls and an AI voice assistant. Boult's product information says the GoBoult Amp App can be used to customize touch controls and switch between available EQ modes.
Durability: IPX5
The earbuds carry an IPX5 water-resistance rating. This provides protection against water jets under the applicable testing conditions, making the earbuds more suitable for workouts and everyday splashes.
IPX5 should not be interpreted as full waterproofing or suitability for submersion.
Boult Audio Z40 Pros & Cons
- ✓ Up to 60 hours total playback
- ✓ 10mm BoomX technology drivers
- ✓ Zen environmental noise cancellation
- ✓ Bluetooth 5.3
- ✓ Type-C fast charging
- ✓ Low-latency gaming mode
- ✓ IPX5 water resistance
- ✓ Android and iOS compatibility
- × Zen ENC is environmental noise cancellation, not ANC
- × 60-hour figure includes the charging case
- × Battery life varies with real-world usage
- × IPX5 does not mean the earbuds can be submerged
- × Codec support is limited to AAC and SBC
Boult Audio Z40 Specs at a Glance
| Specification | Boult Audio Z40 |
|---|---|
| Type | True Wireless In-Ear Earbuds |
| Driver | 10mm BoomX Technology |
| Playback | Up to 60 hours total |
| Bluetooth | 5.3 |
| Codecs | AAC, SBC |
| Noise Cancellation | Zen Mode Environmental Noise Cancellation |
| Microphones | Quad Mic setup |
| Charging | USB Type-C |
| Fast Charging | 10 min = up to 100 min playback |
| Gaming | Adaptive Low Latency |
| Water Resistance | IPX5 |
| Voice Assistant | Supported |
| Compatibility | Android & iOS |
| Warranty | 1 year |
Who Should Buy It?
Everyday Listeners
A practical option for music, videos and everyday wireless listening with long total battery life.
Casual Gamers
The low-latency mode is designed for gaming where reduced audio delay matters.
Call Users
Quad-mic Zen ENC is designed to improve voice clarity in environmental noise.
Battery-Focused Users
The claimed 60-hour total playback figure reduces the need for frequent case charging.
Workout Users
IPX5 water resistance provides added protection against sweat and everyday splashes.
Android & iOS Users
Bluetooth compatibility supports both major mobile operating systems.
OtakuFinds Assessment
Editorial assessment based on published specifications and features. It is not an independent laboratory score or a claim of hands-on testing.
Final Verdict
A feature-packed budget TWS option
The Boult Audio Z40 combines the features commonly sought in affordable TWS earbuds: long claimed battery life, 10mm drivers, environmental noise cancellation, Bluetooth 5.3 and a dedicated low-latency mode.
The 60-hour total playback claim and 10-minute fast-charge feature are particularly useful for users who want fewer charging interruptions. IPX5 protection also adds practical protection for workouts and everyday use.
The main point to keep in mind is that Zen ENC is environmental noise cancellation for calls rather than active noise cancellation for listening. Real-world battery life and low-latency performance will also depend on usage and device conditions.
Boult Audio Z40 FAQ
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