Audison AP 4 4" Midrange Speakers

The Audison AP 4 is a pair of 4-inch car-audio midbass/midrange drivers designed for factory-location upgrades where space is limited. Their compact format and shallow installation profile help address fitment challenges in many OEM speaker positions. They are intended for listeners building a more detailed front stage or replacing small factory drivers.

With a 4-ohm nominal impedance, 40-watt continuous power handling, and 91 dB sensitivity, the AP 4 is suited to compatible factory-power and amplified systems. Its 80 Hz to 7.5 kHz frequency response covers a broad midbass and midrange range for a driver of this size. The sound-oriented design focuses on clear, balanced reproduction through the vocal and upper-midrange region.

A 25 mm pure-copper voice coil supports controlled performance through the mid-high frequencies. The cone is engineered to provide a calibrated mechanical low-pass behavior, so Audison states that a passive crossover is not required to maximize driver efficiency. This makes the AP 4 a practical option for system designs that need a dedicated small-format midrange or midbass driver.

The water-repellent treated paper cone uses a profile developed with FEM simulation and optimized with Klippel Scan Vibrometer measurement. Its shallow Triple Wave TPU surround is designed to support linear excursion. Together, these elements support a compact driver intended for accurate output in OEM-style mounting locations.

The AP 4 can be used as part of a component-based car-audio upgrade with appropriate system tuning and amplification. It is supplied as a pair, allowing installation across left and right speaker locations. Confirm the vehicle's opening diameter, mounting depth, wiring polarity, and available signal range before installation.

Key Features

• 4-Inch Driver Size: Fits applications designed for 100 mm speakers.
• 40W Continuous Handling: Supports power-matched factory or amplified systems.
• 25 mm Copper Voice Coil: Helps maintain balanced mid-high-frequency reproduction.
• Water-Repellent Paper Cone: Uses a treated paper cone construction.
• Triple Wave TPU Surround: Supports linear cone excursion in a shallow profile.
• Mechanical Low-Pass Behavior: Reduces the need for a passive crossover.

Design & Installation

The AP 4 uses a water-repellent treated paper cone, a 25 mm pure-copper voice coil, and a thermoplastic polyurethane surround with Audison's shallow Triple Wave profile. Its compact basket has an abrasion-resistant, scratch-resistant coating. The driver has a nominal 100 mm diameter, a 103 mm outer diameter, and a 0.4 kg listed weight.

Check for a 93 mm installation opening and approximately 41 mm of mounting-depth clearance before purchase; the manufacturer also lists a 43 mm overall depth dimension. Use the pair in matching left/right locations with a compatible 4-ohm signal path and power source. APG 4 protective grilles are listed by Audison as an optional accessory rather than a confirmed included item.