Pioneer TS-A878 3.5" 2-Way Coaxial Car Speakers

The Pioneer TS-A878 is a pair of compact 3.5-inch, 2-way coaxial car speakers designed for factory-speaker replacement in vehicles with limited mounting space. It is suited to drivers who want clearer sound from dash, rear-panel, or other small speaker locations without changing the rest of the audio system. The custom-fit design is intended for select GM, Ford, and Volkswagen applications, subject to measurement and vehicle-specific fitment verification.

Its coaxial layout places a PEI hard-dome tweeter over the woofer, allowing a single speaker location to cover both midrange and high-frequency content. This arrangement helps provide direct, intelligible vocals and defined treble from compact factory locations. With a 60 Hz to 28 kHz frequency range, the TS-A878 is focused on full-range support rather than deep-bass duty.

The 3.5-inch carbon- and graphite-reinforced IMPP cone is made for rigidity in a compact driver, while the PEI dome tweeter is designed for smooth high-frequency reproduction. The speaker has a 4-ohm nominal impedance for use with typical car-audio speaker outputs. Its 88 dB sensitivity supports use with modest-power factory or aftermarket head units.

Power handling is rated at 60 watts maximum per pair and 15 watts nominal per speaker when used with the included in-line filter. This makes the TS-A878 a sensible match for factory radio power or conservatively matched aftermarket amplification. It should be paired with appropriate high-pass filtering when system tuning allows, especially when high output is desired.

For a balanced upgrade, the TS-A878 can be used to replace small factory speakers while larger door speakers or a subwoofer handle more of the midbass and low bass. Its compact 1-3/8-inch mounting depth helps where clearance behind the mounting surface is limited. Confirm cutout size, depth, mounting tabs, and connector compatibility before installation.

Key Features

• 3.5-Inch Coaxial Design: Combines woofer and tweeter in one compact speaker assembly.
• 2-Way Sound Reproduction: Separates high-frequency duties from the main cone for clearer detail.
• Carbon-Graphite IMPP Cone: Reinforced cone construction supports rigidity in a small driver.
• PEI Hard-Dome Tweeter: Provides controlled, smooth high-frequency output from the center-mounted tweeter.
• 4-Ohm Impedance: Works with conventional car-radio and compatible amplifier speaker outputs.
• Custom-Fit Basket: Designed for select GM, Ford, and Volkswagen speaker locations.

Design & Installation

The TS-A878 uses a carbon- and graphite-reinforced IMPP woofer cone with a 26 mm polyetherimide hard-dome tweeter. Its compact coaxial construction places both drivers in a single round speaker chassis, and the black finish integrates discreetly into many factory locations. The speaker pair is supplied without grilles.

Verify the 3-inch cutout requirement and 1-3/8-inch mounting depth before ordering, since vehicle fitment guides are reference tools rather than guarantees. Use the included mounting hardware and speaker connection cables as applicable, maintain correct positive and negative polarity, and use the included in-line filters. These speakers are appropriate for direct replacement on a compatible head unit or for use on a conservatively power-matched amplified channel.