DOSS SoundBox Pro+ P400 Bluetooth Speaker - 50W Extra Bass

In this review of the DOSS SoundBox Pro+ P400 Bluetooth speaker the bottom line is straightforward: this is a portable, party-ready speaker for people who want loud, punchy sound and a visual light show without fuss. The review finds the speaker excels at delivering robust full-range audio from its dual 25W drivers and a backside passive radiator, while the phantom mirror lights give an attention-grabbing ambiance for gatherings. Battery life and wireless stereo pairing round out a package aimed at outdoor entertaining and home parties rather than critical studio listening.

Key Features

• 50W Dynamic Full-Range Sound: Dual 25W full-range drivers and DSP technologies deliver balanced, room-filling audio that works well for both indoor and outdoor use.
• Punchy Bass: A backside passive radiator increases sound pressure for deeper low-end, and the Extra Bass button boosts low frequencies with minimal added distortion.
• Phantom Mirror Light Show: Six distinct lighting modes including Breath, Strobe and Circle let you tailor the look of parties with synchronized color and motion effects.
• Extended Playtime: Up to 26 hours of playback at 50% volume provides all-day listening for picnics, road trips, or long gatherings without frequent recharging.
• Wireless Stereo Pairing: Pair two units for a stereo setup and a combined 100W output, with lights that sync to the music for a cohesive audio-visual experience.

Who It's For

This speaker is ideal for people who host small parties, enjoy outdoor weekends, or want a durable, waterproof Bluetooth speaker with a striking light display. The IPX5 rating and long battery life make it a good companion for backyard barbecues, camping, or poolside listening when you want both loud sound and visual flair.

It is less suitable for audiophiles seeking neutral, reference-level accuracy or for those who need a compact pocket speaker; the SoundBox Pro+ prioritizes power and bass extension over compact size or studio-grade fidelity.

Pros & Cons

Pros

• Powerful 50W output that comfortably fills medium to large spaces.
• Strong bass response thanks to the backside passive radiator and Extra Bass mode.
• Long battery life of up to 26 hours at moderate volume keeps events going all day.
• Attractive phantom mirror lighting with multiple modes enhances party atmosphere.

Cons

• Not designed for studio-grade listening; tonal neutrality is secondary to impact.
• Auto power-off after inactivity may require reactivation during intermittent use.

Specifications

Output Power	50W (dual 25W drivers)
Bass Feature	Backside passive radiator with Extra Bass button
Lighting	Phantom mirror lights, 6 modes (Breath, Strobe, Circle, Cross, Trill, Off)
Battery Life	Up to 26 hours at 50% volume
Water Resistance	IPX5 waterproof
Stereo Pairing	Wireless pairing for two speakers (100W total)

Our Verdict

The DOSS SoundBox Pro+ P400 is a compelling choice for buyers who want powerful, bass-forward sound plus an engaging light show at a reasonable price. Its long battery life, waterproofing, and stereo pairing capability make it a versatile pick for outdoor and party use, offering strong value for anyone prioritizing volume and atmosphere over studio-accurate sound reproduction.

Frequently Asked Questions

Can I turn off the lights?
Press the Power button and Extra Bass button simultaneously to turn the lights off.

How do I change light modes and colors?
Press and hold the Extra Bass button for 2 seconds to cycle light modes; press and hold the Mode button for 3 seconds to change colors.

Why does the speaker auto power off?
The speaker has an auto power-off function that shuts down after 10-15 minutes of inactivity to save battery.