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Radio Design Labs D-HPA3
3.5W Single-Gang Wall-Mounted Audio Power and Headphone Amplifier

OUR PART #  D-HPA3

Our Price: $181.42
List Price: $242.68
You save 25%! (Low Price Guarantee)
Usually ships in 7-14 business days.
Need it sooner? Call us!

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The Radio Design Labs 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.

Radio Design Labs D-HPA3 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

Radio Design Labs D-HPA3 Specifications:

  • Input:  20 kOhm balanced or unbalanced bridging
  • Input Level:  +4 dBu nominal (Balanced, Lowinput sensitivity); -15 dBV nominal (Unbalanced, High input sensitivity)
  • Minimum Input Level:  -18 dBu (Balanced, 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 (headphones):  10 mW into 100 ohms (normal); 30 mW into 100 ohms (maximum)
  • Output Power (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 Recommended
  • Dimensions (HxWxD):  4.13" x 1.7" x 2.05"(10.49cm x 4.32cm x 5.21cm)
  • Package Type:  Cardboard Box
  • Package Dimensions:  3.625 x 4.625 x 2.125 in.
  • Shipping Weight:  0.405 lbs.
  • WEEE weight:  0.270 lbs.
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Desk Top Chassis for Decora, White
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Usually ships in 7-14 business days.
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Usually ships in 7-14 business days.
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Radio Design Labs D-HPA3
3.5W Single-Gang Wall-Mounted Audio Power and Headphone Amplifier

OUR PART #  D-HPA3

Product Information:

The Radio Design Labs 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.

Radio Design Labs D-HPA3 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

Radio Design Labs D-HPA3 Specifications:

  • Input:  20 kOhm balanced or unbalanced bridging
  • Input Level:  +4 dBu nominal (Balanced, Lowinput sensitivity); -15 dBV nominal (Unbalanced, High input sensitivity)
  • Minimum Input Level:  -18 dBu (Balanced, 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 (headphones):  10 mW into 100 ohms (normal); 30 mW into 100 ohms (maximum)
  • Output Power (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 Recommended
  • Dimensions (HxWxD):  4.13" x 1.7" x 2.05"(10.49cm x 4.32cm x 5.21cm)
  • Package Type:  Cardboard Box
  • Package Dimensions:  3.625 x 4.625 x 2.125 in.
  • Shipping Weight:  0.405 lbs.
  • WEEE weight:  0.270 lbs.
3RU Rack Panel Mount for 9 Decora Models
Radio Design Labs RM-D9 3RU Rack Panel Mount for 9 Decora Models
Radio Design Labs' RM-D9 is a 3 RU rack panel that allows the mounting of 9 Decora products, such as RDL remote controls and D-Series connector plates. The installer can label each installed module behind an included protection lens.The ...
67.75 90.63 25
In Stock
Single-Gang Universal Wall Box
Radio Design Labs WB-1U Single-Gang Universal Wall Box
Can be mounted in International or US walls and cabinets. Features side and rear mounting holes which secure the box in new construction. Also has folding tabs which secure the box in an existing wall or cabinet.Dimensions: Height: 4.125 ...
14.20 16.75 15
In Stock
Wall Plate, Single Cover Plate, White
Radio Design Labs CP1-W Wall Plate, Single Cover Plate, White
For use with RDL R style remote controls and D style connector plates; Mount with RDL WB-1U Universal Wall Box.
11.06 13.05 15
In Stock
Desktop or Wall-Mounting Decora Remote Control or Panel Chassis (Gray)
Radio Design Labs DC-4G Desktop or Wall-Mounting Decora Remote Control or Panel Chassis (Gray)
Radio Design Labs' DC-4G desktop chassis holds four Decora®-style products, including RDL remote controls and connector plates.  Installation is facilitated using the included mounting plate, which allows the chassis to mount to ...
93.06 124.48 25
Usually ships in 7-14 business days.
Need it sooner? Call us!
Desktop/Wall-Mounted Chassis for Decora® Remote Controls and Panels
Radio Design Labs DC-3G Desktop/Wall-Mounted Chassis for Decora® Remote Controls and Panels
Radio Design Labs' DC-3G desktop chassis holds three Decora®-style products, including RDL remote controls and connector plates.  Installation is facilitated using the included mounting plate, which allows the chassis to mount ...
79.59 106.46 25
Usually ships in 7-14 business days.
Need it sooner? Call us!
White Desktop or Wall-Mounted Chassis for Decora® Remote Controls and Panels
Radio Design Labs DC-3W White Desktop or Wall-Mounted Chassis for Decora® Remote Controls and Panels
Radio Design Labs' DC-3W desktop chassis hold three Decora®-style products, including RDL remote controls and connector plates.  Installation is facilitated using the included mounting plate, which allows the chassis to mount to a ...
79.59 106.46 25
Usually ships in 7-14 business days.
Need it sooner? Call us!
Wall Mount Chasis for Decora
Radio Design Labs DC-2G Wall Mount Chasis for Decora
The DC-2G desktop chassis holds two Decora®-style products, including RDL remote controls and connector plates. Installation is facilitated using the included mounting plate, which allows the chassis to mount to a tabletop or on a ...
66.33 88.72 25
Usually ships in 7-14 business days.
Need it sooner? Call us!
Desk Top Chassis for Decora, White
Radio Design Labs DC-2W Desk Top Chassis for Decora, White
The DC-2W white desktop chassis holds two Decora®-style products, including RDL remote controls and connector plates. Installation is facilitated using the included mounting plate, which allows the chassis to mount to a tabletop or on a ...
66.33 88.72 25
Usually ships in 7-14 business days.
Need it sooner? Call us!
1RU Rack Panel Mount for 3 Decora Models
Radio Design Labs RM-D3 1RU Rack Panel Mount for 3 Decora Models
Radio Design Labs' RM-D3 is a 1 RU rack panel that allows the mounting of 3 Decora products, such as RDL® remote controls and D-Series connector plates. The installer can label each installed module behind an included protection lens. The ...
58.27 77.95 25
Usually ships in 7-14 business days.
Need it sooner? Call us!
Desktop or Wall Mounted Chassis for Decora Remote Controls and Panels
Radio Design Labs DC-1W Desktop or Wall Mounted Chassis for Decora Remote Controls and Panels
The Radio Design Labs DC-1W desktop chassis holds one Decora-style product, which includes RDL remote controls and connector plates. Installation is facilitated using the included mounting plate, which allows the chassis to mount to a ...
52.78 70.58 25
Usually ships in 7-14 business days.
Need it sooner? Call us!
Wall Mount Chasis for Decora
Radio Design Labs DC-1G Wall Mount Chasis for Decora
The DC-1G desktop chassis holds one Decora®-style product, including RDL remote controls and connector plates. Installation is facilitated using the included mounting plate, which allows the chassis to mount to a tabletop or on a vertical ...
52.78 70.58 25
Usually ships in 7-14 business days.
Need it sooner? Call us!
Gray Dual-Gang Surface Mount Boxes for 2 Decora Remote Controls and Plates
Radio Design Labs SMB-2G Gray Dual-Gang Surface Mount Boxes for 2 Decora Remote Controls and Plates
Radio Design Labs' SMB-2G dual-gang surface mount boxes holds two Decora®-style products, including RDL remote controls and connector plates.  Knockouts are provided for fastening standard metric or North American conduits to the ...
43.00 57.51 25
Usually ships in 7-14 business days.
Need it sooner? Call us!
Single-Gang Gray Surface Mount Boxes for Decora-Style Devices
Radio Design Labs SMB-1G Single-Gang Gray Surface Mount Boxes for Decora-Style Devices
Radio Design Labs' SMB-1G surface mount boxes holds one Decora®-style products, including RDL remote controls and connector plates.  Knockouts are provided for fastening standard metric or North American conduits to the rear of the ...
39.55 52.89 25
Usually ships in 7-14 business days.
Need it sooner? Call us!
Dual-Gang Universal Wall Box
Radio Design Labs WB-2U Dual-Gang Universal Wall Box
Can be mounted in International or US walls and cabinets. Features side and rear mounting holes which secure the box in new construction. Also has folding tabs which secure the box in an existing wall or cabinet.Dimensions: Height: 4.125 ...
15.32 18.06 15
Usually ships in 7-14 business days.
Need it sooner? Call us!
Stainless Steel Quad Cover Plate
Radio Design Labs CP-4S Stainless Steel Quad Cover Plate
For use with RDL SMB-4 and DC-4 for mounting RDL remote controls and jack panels.  Compatible with Decora style products and American electrical boxes.Shipping Weight: 0.16 lbsPackage Dimensions: 7" x 9"
13.92 16.42 15
Usually ships in 7-14 business days.
Need it sooner? Call us!
Double Cover Plate/Gray
Radio Design Labs CP-2/G Double Cover Plate/Gray
For use with RDL R style remote controls and D style connector plates; Mount with RDL WB-2U Universal Wall Box. 
12.03 14.19 15
Usually ships in 7-14 business days.
Need it sooner? Call us!
Stainless Steel Dual-Gang Wall Plate
Radio Design Labs CP-2S Stainless Steel Dual-Gang Wall Plate
Dimensions: 4.55" x 4.55" (11.6 x 11.6 cm)
12.03 14.19 15
Usually ships in 7-14 business days.
Need it sooner? Call us!
Single Gang Decora Cover Plate in Stainless Steel
Radio Design Labs CP-1S Single Gang Decora Cover Plate in Stainless Steel
The Radio Design Labs CP-1S is a single gang decora cover plate in stainless steel.Dimensions: 4.55" H x 2.8" W (11.6 x 7.1 cm)Package Dimensions: 2" x 3"Shipping Weight: 0.072 lbs
11.07 13.05 15
Usually ships in 7-14 business days.
Need it sooner? Call us!
Single-Gang Gray Wall Plate for SMB-1, DC-1, WB-1U, Decora-Style Products
Radio Design Labs CP-1/G Single-Gang Gray Wall Plate for SMB-1, DC-1, WB-1U, Decora-Style Products
Radio Design Labs' CP-1G is for use with RDL SMB-1, DC-1 and WB-1U for mounting RDL remote controls and jack panels.  Compatible with Decora style products and American electrical boxes.Height: 4.55" (11.6 cm)Width: 2.80" (7.1 cm)
11.06 13.05 15
Usually ships in 7-14 business days.
Need it sooner? Call us!
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