JBL Go 4 Review – Ultra‑Portable IP67 Speaker with Punchy Bass, 7‑Hour Battery, and JBL Pro Sound

Key Specifications at a Glance

Table of Contents

1. Introduction

2. Design and Build – Rugged IP67, Ultra‑Light, and Pocket‑Sized

3. Audio Performance – Surprising Volume and Punchy Bass

4. Battery Life – 7 Hours with Playtime Boost Mode

5. Auracast Pairing – Connect Multiple JBL Speakers

6. JBL Portable App – Custom EQ for Fine‑Tuned Sound

7. What’s in the Box

8. Pros and Cons

9. Frequently Asked Questions (FAQ)

10. Conclusion – Is the JBL Go 4 Worth It?

1. Introduction

The JBL Go 4 is an exceptional ultra‑portable speaker, delivering surprisingly loud audio, clear vocals, and punchier bass than its tiny size suggests. While it cannot compete with large boomboxes for deep sub‑bass, it represents a massive upgrade over phone speakers and its own predecessor, the Go 3. The Go 4 punches well above its weight class with distinct JBL Pro Sound – delivering tight, rhythmic bass response for acoustic and pop tracks. It features a fully IP67 waterproof and dustproof rating, making it ideal for beach or pool use. Battery life is rated at 7 hours, plus an additional 2 hours via “Playtime Boost” mode that reduces audio quality to extend playback. Auracast allows you to connect multiple JBL speakers together wirelessly for a wider soundstage. The speaker weighs just 190g and includes an integrated strap loop for easy attachment to bags or belts. The companion app provides customizable EQ curves to fine‑tune the sound to your preference.

For Android users, the JBL Go 4 integrates seamlessly with the Android ecosystem via Bluetooth and the JBL Portable app.

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2. Design and Build – Rugged IP67, Ultra‑Light, and Pocket‑Sized

The JBL Go 4 maintains the iconic Go series design with a square, rounded profile. It measures approximately 9 × 7 × 4 cm and weighs only 190g, easily fitting into a pocket or hanging from a bag using the integrated strap loop. The exterior is covered in durable fabric (or rubberised finish, depending on colour) that resists scratches and impacts. The IP67 rating means it is fully dustproof and can be submerged in up to 1 metre of water for 30 minutes – perfect for beach trips, poolside parties, or accidental drops in the sink. Physical buttons on the top (or side) control power, volume, playback, and Bluetooth pairing. The speaker is available in multiple colours, including Black, Blue, Red, and more.

3. Audio Performance – Surprising Volume and Punchy Bass

The JBL Go 4 delivers JBL Pro Sound, which is engineered to produce surprisingly loud volume and clear vocals from such a small enclosure. The mid‑bass is punchy and tight, making acoustic tracks, pop music, and podcasts sound engaging. However, due to its tiny size, it physically lacks sub‑bass extension – don’t expect deep rumble. Vocals remain crisp and distinct even at higher volumes, and there is minimal distortion. The speaker is a massive upgrade over phone speakers, and it outperforms many similarly sized competitors. Using the companion app, you can adjust a custom EQ to boost treble or reduce bass according to your taste.

4. Battery Life – 7 Hours with Playtime Boost Mode

The JBL Go 4 offers up to 7 hours of continuous playback on a single charge at moderate volume. For longer listening sessions, you can enable Playtime Boost mode via the JBL Portable app. This mode reduces audio quality (by lowering bitrate or limiting dynamic range) to extend battery life by an additional 2 hours (total 9 hours). A full charge takes approximately 2.5 hours via USB‑C. The battery is non‑removable.

5. Auracast Pairing – Connect Multiple JBL Speakers

The JBL Go 4 supports Auracast, Bluetooth’s audio broadcasting feature. This allows you to wirelessly pair multiple Auracast‑compatible JBL speakers (e.g., another Go 4, or other JBL models) to create a wider stereo soundstage or party mode. You can connect several speakers to play the same audio simultaneously, filling a larger area with sound. Pairing is done through the JBL Portable app or via button combinations.

6. JBL Portable App – Custom EQ for Fine‑Tuned Sound

The JBL Portable app (available for Android and iOS) unlocks several features:

• Customizable EQ – Adjust the 5‑band equaliser to boost bass, enhance treble, or create a personalised sound profile.

• Playtime Boost – Toggle the extended battery mode on/off.

• Auracast pairing – Manage multi‑speaker connections.

• Firmware updates – Keep the speaker up to date.

• Product registration and support.

The app is intuitive and adds significant value, especially for users who want to tailor the audio.

7. What’s in the Box

When you purchase the JBL Go 4, you will receive:

• JBL Go 4 portable speaker

• USB‑C charging cable

• Quick start guide

• Warranty card

Note: A wall charger is not included.

8. Pros and Cons

Pros

Cons

9. Frequently Asked Questions (FAQ)

Q1: Is the JBL Go 4 waterproof?

A: Yes, it has an IP67 rating – fully dustproof and waterproof up to 1 metre for 30 minutes.

Q2: How long does the battery last?

A: Up to 7 hours normally, and up to 9 hours with Playtime Boost mode enabled.

Q3: Can I pair two JBL Go 4 speakers together?

A: Yes, using Auracast you can connect multiple compatible JBL speakers for stereo or party mode.

Q4: Does it have a microphone for calls?

A: The specs do not mention a microphone; it is primarily a music speaker.

Q5: Can I use the JBL Portable app with the Go 4?

A: Yes, the app supports EQ customisation, Playtime Boost, and Auracast pairing.

10. Conclusion – Is the JBL Go 4 Worth It?

The JBL Go 4 is the best ultra‑portable speaker for anyone who wants surprisingly loud, clear audio in a tiny, rugged package. Its IP67 waterproofing and 190g weight make it perfect for travel, beach days, hiking, or simply upgrading your phone’s speaker at home. The JBL Pro Sound delivers punchy mid‑bass and crisp vocals, and the custom EQ via the app lets you dial in your preferred sound. Playtime Boost extends battery life when needed, and Auracast allows you to connect multiple speakers for a bigger soundstage.

For Android users, the Go 4 integrates seamlessly with the Android ecosystem via Bluetooth and the JBL Portable app. While it won’t replace a large party speaker for deep bass, its portability and durability make it an excellent value. If you need a go‑anywhere speaker that punches above its weight, the JBL Go 4 is a smart investment.

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