BOSS Audio Systems 5.25" P55.4C 4-Way Car Door Speakers

The BOSS Audio Systems P55.4C Phantom is a 5.25-inch, four-way coaxial car door speaker pair engineered for full-range in-vehicle sound with up to 300 watts peak power handling.

Built to deliver clear highs, defined mids and solid low-end from a compact 5.25" chassis, the P55.4C combines an electroplate injection cone, rubber surround and a die-cast aluminum frame for strength and reduced resonance. Two piezo tweeters plus a dedicated mylar midrange give these coaxial speakers a layered response across 85 Hz–20 kHz, while a shallow 2.1" mounting depth helps fit them into many factory door locations.

How will these speakers improve my car audio clarity?

The P55.4C separates frequencies across four drivers so vocals, instruments and treble detail remain distinct even at higher volumes. The rigid die-cast frame and electroplate cone reduce unwanted vibrations, producing cleaner sound with less coloration.

• Four-way design: dual tweeters, midrange and woofer for frequency separation
• 93 dB sensitivity for efficient output from modest headunit power
• Die-cast aluminum basket reduces resonance and maintains linear cone travel

Will these fit my car and how difficult is installation?

The speakers have a 2.1" mounting depth and a 4.7" mounting hole diameter, compatible with many factory locations for 5.25" replacements. Because wiring and door access vary by vehicle, professional installation is recommended for secure mounting and optimal sound staging.

• Mounting depth: 2.1 inches — fits many shallow door pockets
• Mounting hole: 4.7 inches — standard for 5.25" speaker openings
• Sold in pairs; wiring and adapters may be needed for some factory harnesses

What are the speaker’s key technical specs I should note?

These coaxial speakers operate at 4 ohms impedance with a frequency response spanning 85 Hz to 20 kHz and a 300-watt peak power rating. The construction combines an electroplate injection cone, rubber surround, a 1.5" aluminum voice coil and piezo tweeters to balance durability with high-frequency detail.

• Peak power: 300 watts; impedance: 4 ohms
• Sensitivity: 93 dB @ 1 W/1 m — efficient output for factory amps
• Drivers: two 0.5" piezo tweeters, 1.25" mylar midrange, electroplate woofer

How durable and supported are these speakers?

Rugged materials—rubber surround and die-cast frame—help resist long-term fatigue and vibration from road use. BOSS Audio Systems backs these speakers with an online dealer warranty when purchased through authorized channels, and professional installation is encouraged to protect the warranty and ensure safe, reliable performance.

• Heavy-duty cast basket for structural rigidity
• Rubber surround for extended cone life and controlled excursion
• Three-year platinum online dealer warranty (conditions apply)

Who is this for: The BOSS P55.4C is aimed at drivers who want a budget-friendly upgrade from factory speakers without wholesale dash modifications. It's a good match for those seeking noticeable improvements in treble clarity and midrange definition from a compact 5.25" speaker pair, especially when used with a head unit or amplifier that can supply moderate power. Choose professional installation if you want a clean fit, trouble-free wiring and the best acoustic results.