STX Audio STX-D504 Double DIN CD/MP3 Receiver

The STX Audio STX-D504 is a Double DIN in-dash receiver designed to add traditional CD playback and convenient digital music sources to a vehicle audio system. It combines Bluetooth connectivity, USB, SD-card, auxiliary-input, and FM-radio functions in one dashboard component. This makes it suitable for drivers who want multiple ways to access music without adding separate source devices.

Built-in Bluetooth supports wireless audio streaming and hands-free phone calling from a compatible Bluetooth-enabled phone. USB, SD-card, and front auxiliary connections provide wired and removable-media playback alternatives. The receiver also includes an FM tuner for listening to local radio broadcasts.

The STX-D504 uses an integrated Class A/B amplifier circuit and is advertised with a four-channel MOSFET speaker output. Its published output claim is 300 watts total, stated as 75 watts across each of four channels; no RMS rating is documented in the available product information. It is intended as a self-contained source unit for a conventional four-speaker vehicle audio system.

A built-in CD/MP3 player gives the STX-D504 an option that many media-only receivers do not provide. An equalizer function is also listed, allowing basic tonal adjustment from the receiver. The included remote control can provide source and playback control from elsewhere in the vehicle.

This receiver is an option for replacing an older Double DIN radio or building a straightforward audio upgrade around factory-style speakers. It can serve as the source unit in a larger system, with its Bluetooth and media inputs handling everyday listening. Verify dashboard fitment, wiring compatibility, antenna connections, and any vehicle-specific installation accessories before purchase.

Key Features

• Double DIN Chassis: Fits dashboards designed for a 2-DIN in-dash receiver.
• Bluetooth Connectivity: Supports wireless music streaming and hands-free calling with compatible phones.
• CD/MP3 Playback: Plays CDs and MP3 media through the integrated player.
• USB And SD Inputs: Provides playback access for supported removable digital media.
• FM Radio Tuner: Adds access to local FM radio programming.
• Four-Channel MOSFET Output: Supplies an integrated amplified output for four speaker channels.

Design & Installation

The STX-D504 is an integrated Double DIN radio chassis with a built-in CD mechanism, front-panel media connectivity, display, physical controls, and remote-control capability. Available product information identifies the receiver's integrated Class A/B amplifier design, but does not publish specific enclosure-material or faceplate-material details. Its layout brings radio, disc, wired-media, and Bluetooth functions into a single dashboard location.

Installation requires a vehicle with a compatible Double DIN opening or the appropriate dash-installation kit. Connect the vehicle power, ground, speaker wiring, and radio antenna using the correct vehicle-specific harnesses and adapters as needed; these accessories are not confirmed as included. Confirm fitment before purchase, especially when retaining steering-wheel controls, factory amplifiers, or other original vehicle electronics.