Radio Design Labs RDL-D-HPA3C

Availability: Available Unavailable

Product Type: Pro Audio

Product Vendor: Radio Design Labs

Product SKU: RDL-D-HPA3C

(Custom Labeled) Overview 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...

Login for Price


ATTENTION! TARIFFS AND INDUSTRY IMPACT: All Pricing is subject to change without notice due to industry wide Tariff increases with several major manufacturers. Please check with your sales rep for current and updated pricing information prior to ordering. Quotes are only valid for the day they are provided. Returns for credit - New product may be approved to be returned for credit within 30 days of original packaging. Product must be new, unopened and in original packaging Returns and canceled orders are subject to a 25% restocking fee. -MANY ITEMS ARE CURRENTLY ON BACKORDER. PLEASE VERIFY PRICING AND AVAILABILITY ON ALL PRODUCTS WITH YOUR SALES REP VIA CHAT, EMAIL, OR PHONE BEFORE PLACING AN ORDER

Product Details

(Custom Labeled)


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.


  • 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


Input 20 k? 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)
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 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 0.41 lbs.
WEEE weight .270 lbs.
Tariff code 8518.40.2000

Your cart