3.5 Watt Decora Audio Amplifier-Black

Ideal Use Cases

The RDL DB-PA3 is a black Decora wall-mounted audio amplifier designed for compact installations that need both a permanently connected source and an accessible local input. Its rear-panel balanced input accommodates installed audio wiring, while the front-panel mini-jack provides a convenient connection for an unbalanced source. Automatic switching between the two inputs makes the amplifier well suited to systems that need to accept either source without a separate source-selection control.

The amplifier directly drives a 4- or 8-ohm speaker, making it appropriate for localized voice or music systems where the amplifier, input connection, and gain control need to remain close to the listening area. Its narrow wall-mounted format is particularly useful when equipment space is limited.

Why Choose This Model

The DB-PA3 combines two-input flexibility, automatic source switching, and speaker amplification in one ultra-compact all-metal unit. Source selection is performed using solid-state switching, and the single-turn front-panel audio-taper gain control keeps level adjustment readily accessible. The amplifier delivers 3.5 W RMS into 8 ohms and increases its maximum output to 6.5 W RMS when connected to a 4-ohm load.

High-efficiency Class D operation supports this compact design. Integrated thermal and short-circuit protection adds protection against the operating conditions specifically identified for the amplifier. These features make the DB-PA3 a focused solution for installations that need simple source access and direct speaker output without a larger standalone amplifier.

Installation and Integration

The DB-PA3 measures 4.13 inches high by 1.7 inches wide by 2.05 inches deep, or 10.49 by 4.32 by 5.21 centimeters. The balanced input and speaker output are located on the rear panel, helping keep permanent signal and speaker wiring behind the wall-mounted unit. The speaker output uses a detachable terminal block, while the mini-jack input and gain adjustment remain available on the front panel.

Operation requires 24 Vdc. Current draw is specified at 30 mA while idle, 55 mA at one-eighth power with normal voice or music, and 225 mA when producing 3.5 W into 8 ohms. The recommended power supplies are the PS-24AS for the USA and the PS-24AX for international use. The specified ambient operating range is 0 to 40 degrees C maximum, with 20 degrees C recommended.

Performance Highlights

The amplifier covers a frequency range of 20 Hz to 20 kHz within plus or minus 1 dB. THD+N is specified at less than 0.1 percent at 1 kHz and 1 W. Noise is rated below -80 dB relative to 1 W RMS when using the balanced input and below -70 dB relative to 1 W RMS through the mini-jack input. Common-mode rejection is greater than 50 dB from 50 Hz to 120 Hz.

Both inputs provide 20 kΩ balanced or unbalanced bridging. Nominal input level is +4 dBu for the balanced low-sensitivity input and -15 dBV for the unbalanced high-sensitivity input. Maximum input level is +22 dBu at low sensitivity and +4 dBu at high sensitivity. These specifications define the DB-PA3 for use with both installed balanced audio sources and locally connected unbalanced equipment.

What Makes It Different

The defining feature of the DB-PA3 is the way it brings together a rear balanced connection and a front mini-jack input with automatic, solid-state source selection. This configuration supports fixed installation wiring while preserving an immediately available connection at the wall. The front-panel gain adjustment, rear detachable speaker terminal, and direct compatibility with either a 4- or 8-ohm speaker keep the signal path and controls concentrated in one compact device.

Its output also scales with speaker impedance: 3.5 W RMS maximum into 8 ohms and 6.5 W RMS maximum into 4 ohms. The black Decora format and all-metal construction complete a design centered on compact wall-mounted integration.

Final Assessment

The RDL DB-PA3 is a specialized wall-mounted amplifier for installations requiring two source connections, automatic switching, accessible gain adjustment, and direct speaker drive. Its balanced rear input, front mini-jack, Class D operation, 20 Hz to 20 kHz response, and protected 4- or 8-ohm output provide a clearly defined feature set in an ultra-compact black enclosure.