BOSS Audio BRS40 4-Inch Car Door Speaker - 50W Max - Sold Individually

Overview

Upgrade your vehicle’s front or rear soundstage with the BRS40 4 inch replacement door speaker from BOSS Audio Systems. This compact, purpose-built speaker fits many factory openings and is designed to deliver clearer highs, more defined mids, and a steadier mid‑bass presence at everyday listening levels. While compact, it is engineered to work calmly with standard radios and can scale with an amplifier if you choose to enrich your system.

Constructed for durability and consistent performance, the BRS40 uses a polypropylene cone paired with a foam surround. This combination is chosen to maintain rigidity during rapid cone movement while still allowing controlled, smooth motion for a balanced overall sound. The 4 ohm impedance is a common match for many factory head units, and a 0.77 inch voice coil helps support reliable control across typical listening ranges.

Key specifications at a glance

• Impedance: 4 ohms for standard compatibility with many car radios
• Power handling: up to 50 watts maximum for a confident daily upgrade
• Frequency response: roughly 100 Hz to 18 kHz for broad music coverage
• Sensitivity: about 82 dB at 1 watt / 1 meter for practical listening levels
• Size and fit: 4.06 x 4.06 inches with a mounting depth of 1.75 inches

Design and build highlights

• Cone material: polypropylene offers lightweight rigidity with steady motion
• Surround: foam provides flexible travel and durable performance
• Basket: stamped metal construction for a solid mount
• Voice coil: 0.77 inch for stable power handling and clear midrange

Real‑world usage and options

Sold individually, the BRS40 is ideal for upgrading a single door or pairing with a second unit for a matched left-right setup. Its compact dimensions help it fit in many factory apertures without major modifications, leaving space for wiring and brackets.

For best results, consider pairing with an appropriate head unit or amplifier to explore enhanced dynamics. The design is aimed at delivering a balanced sound profile suitable for everyday driving, whether you are commuting, running errands, or enjoying a weekend road trip.

Installation and warranty

Professional installation is strongly recommended to ensure correct fit, wiring connections, and safe operation in a vehicle environment.

Warranty and support: BOSS Audio Systems backs this speaker with a 3-year platinum online dealer warranty, underscoring a commitment to long-term value in your audio upgrade.