3.5 Watt Decora Audio Power Amplifier-Black (Compatible with Guest Room Audio System)

The RDL DB-TPA1A is a black Decora audio power amplifier designed for compact speaker installations and compatibility with guest room audio systems. It delivers 3.5 W RMS into an 8-ohm load or 6.5 W RMS into a 4-ohm load. High-efficiency Class D operation, RDL Format-A connectivity, VCA level adjustment, and an energy-saving sleep mode combine in an ultra-compact all-metal design.

Ideal Use Cases

This model is suited to guest room audio systems and other installations requiring a compact amplifier for a single 4- or 8-ohm speaker. Its RDL Format-A input allows it to receive audio and power from a compatible RDL twisted-pair Format-A sender. The black Decora configuration supports installations where the amplifier must fit into a compact architectural audio arrangement while providing local level adjustment.

The DB-TPA1A is particularly useful when the available speaker load determines the required output. It supplies up to 3.5 W RMS into 8 ohms and up to 6.5 W RMS into 4 ohms, giving system designers clearly defined performance for either supported speaker impedance.

Why Choose This Model

The DB-TPA1A combines amplification, level control, power delivery, and audio input through a streamlined connection scheme. Audio and power connect through the RJ45 input, while the speaker connects through a detachable terminal block. This arrangement reduces the number of separate connection types required at the amplifier and aligns the unit with RDL Format-A twisted-pair systems.

A single-turn audio-taper VCA attenuator provides gain adjustment. Because the level control uses VCA adjustment, it is designed for scratch-free operation and long service life. Setting the level to minimum activates the energy-saving sleep mode, which consumes less than 0.3 W.

Installation and Integration

The amplifier accepts an RDL Format-A input through an RJ45 connector. It connects to a compatible Format-A sender using twisted-pair cable and is powered by the RDL twisted-pair Format-A sender. The amplified speaker output is presented on a detachable terminal block for connection to a 4- or 8-ohm speaker.

The enclosure measures 4.13 inches high by 1.7 inches wide by 2.15 inches deep, or 10.49 by 4.32 by 5.47 centimeters. Its ultra-compact all-metal construction supports space-conscious integration. The specified ambient operating environment is 0 degrees C to 40 degrees C. Thermal and short-circuit protection are included to protect the amplifier during operation.

Performance Highlights

Output power is rated at a maximum of 3.5 W RMS into 8 ohms and 6.5 W RMS into 4 ohms. Frequency response extends from 50 Hz to 20 kHz within ±1.5 dB. THD+N is less than 0.1% at 1 kHz and 1 W, while common-mode rejection is greater than 50 dB from 50 Hz to 120 Hz.

Power consumption is specified at 45 mA while idle, 95 mA at 1 W into 8 ohms, 150 mA at 1 W into 4 ohms, and 215 mA at 3.5 W into 8 ohms. High-efficiency Class D operation supports the compact design, and sleep mode lowers consumption when the level is set to minimum.

What Makes It Different

Unlike an amplifier requiring separate local audio and power connections, the DB-TPA1A receives both through its RJ45 connection from an RDL Format-A sender. Its combination of twisted-pair integration, VCA gain adjustment, and automatic minimum-level sleep activation addresses audio distribution, local control, and reduced standby consumption in one compact unit.

The model also provides clearly separated connection points: RJ45 for Format-A audio and power, and a detachable terminal block for the speaker output. Its black finish is one of the available product finishes, alongside white and stainless steel versions.

Final Assessment

The RDL DB-TPA1A is a focused choice for a compact Format-A audio system that needs to drive a 4- or 8-ohm speaker. It offers defined RMS output, wide audio frequency response, VCA level control, Class D efficiency, and protective circuitry. For compatible guest room audio systems, it brings amplification and level adjustment into an ultra-compact black Decora design while drawing power directly from the associated RDL Format-A sender.