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RDL DS-HPA3 3.5 Watt Audio Power and Headphone Amplifier
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    RDL DS-HPA3 3.5 Watt Audio Power and Headphone Amplifier

    Manufacturer: Radio Design Labs

    Item #: RDL-DS-HPA3   •   MFG #: DS-HPA3


    List Price:$237.92
    Our Price:$178.88

    free ship
    Availability: Usually ships in 3-10 business days
    This item is currently out of stock and will ship the minute we receive it – normally 3-10 business days. Need it sooner? Call 800-522-2025 and we'll make it happen,or email Customer Service for expedited delivery options. Certain Non-Stock Items Valued over $50.00 may Ship FREE UPS GROUND in the Continental US. Multiple quantities of the same non-Stock Item Valued below $50.00 may be ordered to meet the $50 minimum order requirement to qualify for Free UPS Ground Freight. This offer does not apply to certain freight-intensive or hazardous items. Certain restrictions may apply.



      The D SERIES-HPA3 is a high efficiency 3.5 W power amplifier with one line input, an amplified output to drive a 4 or 8 ohm speaker and a separate headphone amplifier. The -HPA3 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 amplified output levels are controlled by a front-panel volume control.The amplifier features a Mini-Jack headphone output on the front panel. When a headset is plugged in, the power amplifier may be switched off. Two recessed slide switches located on the top of the rear enclosure are set prior to mounting the module. One switch is provided for setting the input sensitivity. The mute switch determines whether the power amplifier operates when headphones are plugged in.Amplification for the speaker output 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-HPA3 is designed to be mounted in a wall box. The front panel does not include any illuminated indicators, making the -HPA3 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.

      • Features

        • Wall-Mounted Amplifier with 2 Outputs
        • Balanced Input on the Rear Panel
        • Speaker Output on the Rear Panel
        • Mini-Jack Headphone Output on the Front Panel
        • Setting to Turn Off Power Amplifier upon Headphone Connection
        • Amplifier Muting Using Solid-State Switching
        • Single Gain Adjustment for the Speaker and Headphone Amplifiers
        • 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
        • High-Efficiency Class D Operation
        • Speaker Output Connection on Detachable Terminal Block
        • Ultra-Compact All Metal Construction
        • Thermal and Short-Circuit Protection
      • Specifications

        • Input: 20 kΩ balanced or unbalanced bridgingInput Level: +4 dBu nominal (Balanced, LowInput sensitivity); -15 dBV nominal (Unbalanced, HighInput sensitivity)
        • MinimumInput Level: -18 dBu (Balanced, Max. gain)
        • MaximumInput Level: +22 dBu (LowInput sensitivity); +4 dBu (HighInput sensitivity)
        • Gain Adjustment: Single-turn audio taper (front-panel)
        • OutputPower (headphones): 10 mW into 100 ohms (normal); 30 mW into 100 ohms (maximum)
        • OutputPower (speaker): 3.5 W RMS (Max., into 8 ohms); 6.5 W RMS (Max., into 4 ohms)
        • Frequency Response: 20 Hz to 50 kHz (Headphones, ± 1 dB); 20 Hz to 20 kHz (Speaker, ± 1 dB)
        • THD+N: < 0.1% (Headphones, 20 Hz to 20 kHz, 10 mW into 100 ohms); < 0.1% (Speaker, 1 kHz, 1 W)
        • Noise: < -85 dB (Headphones, below 10 mW into 100 ohms); < -80 dB (Speaker, below 1 W into 8 ohms)
        • CMRR: > 50 dB (50 Hz to 120 Hz)Power Requirement: 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 RecommendedDimensions: 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: .270 lbs.
        • Tariff code: 8518.40.2000

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