STX Audio STX1500US 10-Inch Amplified Subwoofer

The STX Audio STX1500US is a compact amplified subwoofer designed to add low-frequency reinforcement without requiring a separate external amplifier or a large subwoofer enclosure. Its integrated 10-inch woofer and built-in amplifier make it a practical option for vehicles with limited available space. The slim 68 mm profile is intended for installations beneath a seat or in shallow cargo-area locations.

This model is suited to drivers who want more bass from a factory or aftermarket audio system while keeping the installation footprint compact. It provides both high-level and low-level input sensitivity options, allowing it to work with many OEM speaker-level outputs and aftermarket RCA-equipped receivers. That flexibility can simplify upgrades where changing the head unit is not desired.

The STX1500US is specified with a 55 Hz to 20 kHz frequency response, a signal-to-noise ratio above 90 dB, and total harmonic distortion below 0.4%. Its adjustable low-pass filter lets the installer select a crossover point from 50 Hz to 150 Hz. This helps blend the subwoofer with the vehicle's existing speakers rather than allowing bass output to overlap excessively with them.

For tuning flexibility, the built-in bass boost control adjusts from 0 to +24 dB. A 20 Hz subsonic filter is also specified to reduce amplification of extremely low frequencies. These controls allow the system to be tailored for the vehicle, source unit, and listener preference.

The STX1500US is an all-in-one bass upgrade for space-conscious car audio systems. Its listed 4-ohm woofer, integrated amplification, and selectable input connection methods support use in a range of basic audio-system upgrades. Proper level setting and crossover adjustment are important for balanced integration with full-range speakers.

Key Features

• Integrated Amplifier: Combines the subwoofer and amplifier in one compact enclosure.
• 10-Inch Woofer: Provides dedicated low-frequency reinforcement in a slim-format design.
• Adjustable Low-Pass Filter: Selectable 50 Hz to 150 Hz crossover tuning supports system integration.
• Variable Bass Boost: Offers 0 to +24 dB adjustment for bass-output tailoring.
• Dual Input Compatibility: Supports high-level and low-level source connections.
• 20 Hz Subsonic Filter: Helps limit amplification of extremely low-frequency content.

Design & Installation

The STX1500US uses a slim integrated enclosure measuring 345 x 262 x 68 mm. Its compact form factor combines the 10-inch woofer and built-in amplifier in a single assembly, reducing the need to find mounting space for separate components. Specific enclosure and cone materials were not confirmed in the available product information.

Choose a secure, ventilated mounting location with adequate clearance for the enclosure and wiring, such as an appropriate under-seat or shallow cargo-area space. Connect it using the input type that matches the source unit: high-level input for speaker-level outputs or low-level input for compatible preamp outputs. Set the low-pass filter and bass boost conservatively at first, then fine-tune levels to complement the vehicle's main speakers.