Radio Design Labs DB-PA3
3.5 Watt Audio Amplifier, Decora


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List Price: $227.36
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The Radio Design Labs D SERIES-PA3 is a high efficiency 3.5 W power amplifier with two line inputs and an amplified output to drive a 4 or 8 ohm speaker. The -PA3 features a balanced line level input that may be connected unbalanced. The gain range will accommodate standard unbalanced levels as well as professional balanced levels.

The amplifier features a stereo Mini-Jack input on the front panel. The input is designed to receive standard -10 dBV consumer level signals from sources such as a computer or personal media player. The left and right audio signals received on the Mini-Jack are summed to mono and amplified. When a source is connected, the rear-panel input is switched off. The amplified output level is controlled by a front-panel volume control.

A recessed slide switch on the side of the chassis is set during installation. This switch determines the sensitivity of the balanced rear-panel input.

Amplification is provided by a high-efficiency Class D power stage with audio filtering tailored for crisp, pleasant audio clarity. The high-efficiency Class D output stage produces negligible heat for all levels of expected voice or music modulation.

The D SERIES-PA3 is designed to be mounted in a wall box. The front panel does not include any illuminated indicators, making the -PA3 ideally suited to installation in dark rooms or areas. Wiring is connected through a rear-panel detachable terminal block. Module operation is from a 24 Vdc ground-referenced power supply.

Radio Design Labs DB-PA3 Features:

  • Wall-Mounted Amplifier with 2 Inputs
  • Balanced Input on the Rear Panel
  • Mini-Jack Input on the Front Panel
  • Automatic Switching Between Inputs
  • Source Selection Using Solid-State Switching
  • Front-Panel Gain Adjustment
  • 3.5 Watt RMS Audio Amplifier into 8 Ohms
  • 6.5 Watt RMS Audio Amplifier into 4 Ohms
  • Output Drives 4 or 8 Ohm Speaker
  • Speaker Output on the Rear Panel
  • High-Efficiency Class D Operation
  • Speaker Output Connection on Detachable Terminal Block
  • Ultra-Compact All Metal Construction
  • Thermal and Short-Circuit Protection

Radio Design Labs DB-PA3 Specifications:

  • Inputs (2): 20 kOhms balanced or unbalanced bridging
  • Input Level:
    • +4 dBu nominal (Balanced, Low input sensitivity)
    • -15 dBV nominal (Unbalanced, High input sensitivity)
  • Minimum Input Level: -18 dBu (Balanced, Max. gain); -19 dBV (Unbalanced Mini-Jack, Max. gain)
  • Maximum Input Level: +22 dBu (Low input sensitivity); +4 dBu (High input sensitivity)
  • Gain Adjustment: Single-turn audio taper (Front-panel)
  • Output Power: 3.5 W RMS (Max., into 8 ohms); 6.5 W RMS (Max., into 4 ohms)
  • Frequency Response: 20 Hz to 20 kHz (± 1 dB)
  • THD+N: < 0.1% (@ 1 kHz, 1 W)
  • Noise:
    • < -80 dB (below 1 W RMS, balanced input)
    • < -70 dB (below 1 W RMS, Mini-Jack input)
  • CMRR: > 50 dB (50 Hz to 120 Hz)
  • Power Requirements:
    • 24 Vdc @ 30 mA (Idle)
    • 55 mA (1/8 power; normal voice or music)
    • 225 mA (3.5 W into 8 ohms)
    • Ambient Operating Environment: 0° C to 40° C Maximum; 20° C Recommended
  • Dimensions:
    • Height: 4.13 in. 10.49 cm
    • Width: 1.7 in. 4.32 cm
    • Depth: 2.05 in. 5.21 cm
  • Package Type: Cardboard Box
  • Package Dimensions: 3.625 x 4.625 x 2.125 in.
  • Shipping Weight: .405 lbs.
  • WEEE weight: .27 lbs.
  • Tariff code: 8518.40.2000
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