BT-309A-A HiFi Power Amplifier: Dual-Voltage 50W Stereo for Home and Car Use

The BT-309A-A is a versatile audio component designed to bridge the gap between home entertainment and mobile sound systems. This compact power amplifier delivers a robust 50W+50W of stereo output, configured in a 2.0 channel layout for clear HiFi sound reproduction. Its key advantage lies in its dual-voltage capability, allowing it to operate from standard 220V household mains or a 12V DC source, making it a practical choice for enhancing audio in your living room or vehicle. Beyond amplification, it integrates modern conveniences like wireless Bluetooth streaming, FM radio reception, and a recording function, all accessible via an included remote control. Housed in a sturdy iron chassis, it provides a reliable audio upgrade without requiring a dedicated single-use setup.

Technical Specifications and Performance

The performance of the BT-309A-A amplifier is defined by a clear set of measurable specifications. It is engineered to deliver quality sound across a wide range of speaker setups and listening environments.

Power and Audio Fidelity

The amplifier provides a rated output of 50 watts per channel (50W+50W), which is sufficient to drive a pair of bookshelf or car speakers with clarity. It is specified as a HiFi (High Fidelity) stage amplifier, indicating a design focused on accurate sound reproduction. Key audio performance metrics include a frequency response range from 20 Hz to 20 kHz, covering the full spectrum of human hearing, a signal-to-noise ratio of 80 dB for a clean audio signal, and a low total harmonic distortion rate of 0.1%.

Compatibility and Connectivity

This unit offers broad compatibility with various audio sources and speaker systems. It supports speaker impedance from 4 to 16 ohms, accommodating most common home and car audio speakers. Connection to speakers is made via secure wire clamp terminals. For audio input, it features Bluetooth for wireless streaming from smartphones or tablets, and an integrated FM tuner for terrestrial radio. The recording function allows you to capture audio from these sources. Operation is facilitated by a 2.0 channel design and a supplied remote control.

Dual-Voltage Design and Physical Build

The dual-voltage capability is the cornerstone of this amplifier's versatility, supported by a simple yet robust physical construction.

Flexible Power Supply

The amplifier can be powered in two distinct ways. For permanent home installation, it connects to a standard 220V AC mains supply. For portable or vehicular use, it can be connected to a 12V DC power source, such as a car battery or a suitable DC power supply. This flexibility means you can transfer the amplifier between your home and vehicle without needing separate devices, providing consistent audio enhancement in both locations.

Compact and Durable Chassis

Housed in an iron chassis, the amplifier is built for durability and stability. The main unit dimensions are 20 cm in width, 19.6 cm in depth, and 5.8 cm in height, resulting in a compact footprint that can fit on a shelf, in a cabinet, or under a car seat. The total weight is 1.4 kg, making it solid but manageable. It is supplied in a colour box measuring 21 x 24.5 x 6 cm for retail packaging and protection during transport.

Uses, Setup and Practical Value

The combination of features in the BT-309A-A addresses common audio upgrade scenarios, offering a straightforward setup and clear long-term utility.

Home and Automotive Audio Enhancement

At home, this amplifier can serve as the core of a simple stereo system, powering passive speakers for music from your Bluetooth device or FM radio. In a car, it can significantly improve upon factory-fitted audio by providing more power and cleaner amplification to aftermarket speakers. The recording function adds utility for capturing radio broadcasts or saving audio streams. Its design is intended for the general public, requiring no specialist knowledge for basic installation and use.

Simple Installation and Operation

Setting up the amplifier involves a few key steps. First, connect your speakers to the wire clamp terminals. Next, select the appropriate power source and make the connection (either a 220V mains plug or 12V DC cables). Finally, pair your Bluetooth device or tune the FM radio. The included remote control allows you to adjust volume, change source, or manage playback without needing direct access to the unit, which is particularly useful in car installations.