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 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 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.
Tariff code:
8518.40.2000
RDL Three-Year Limited Warranty
Installation of these products by the Purchaser shall constitute Purchaser’s acknowledgement and acceptance of the terms and
conditions for sale and of this warranty, and shall constitute the Purchaser’s determination of the suitability of this product for the
Purchaser’s intended application. Radio Design Labs, Inc., also referred to as RDL®, warrants to the Purchaser that products
manufactured by RDL are free from defects in material and workmanship. This warranty applies to the period of three years from the date
of shipment, except for component parts or products purchased from other sources and supplied by RDL. Such component parts or
products bear only the warranty of the manufacturer thereof in effect at the time of shipment to the Purchaser. RDL will, without charge,
and after written notice has been received and acknowledged by RDL, repair an RDL product if proved to be defective according to the
usage of the trade, when such equipment is received by RDL at the location it designates with shipment costs prepaid by the Purchaser.
RDL shall not be liable for any expense whether for repairs, replacements, material, service, or otherwise, incurred by the Purchaser or
modifications made by the Purchaser to the product. No equipment shall be deemed defective if it shall fail to operate in a normal or
proper manner due to exposure to excessive moisture in the atmosphere, excessive temperature extremes, improper environmental
cleanliness, or any other environment not consistent with the principles of good engineering practice. In no event shall RDL have any
liability for consequential damage or expense directly or indirectly arising from the use of the products, or any inability to use it either
separately or in combination with other equipment or materials, or from any other cause, whether used in accordance with instructions or
not. This warranty is void if equipment is altered in any way by other than RDL. RDL products are NOT intended for use in life support
appliances, devices, or systems. Use of RDL products in such applications is done solely at the liability of the reseller/installer and/or end
user. RDL reserves the right to change design parameters and specifications at any time without notice. The performance measurements
reflect the products at the time of printing. This warranty is in lieu of all others, either expressed or implied. No representative is authorized
to assume for RDL any other liability in connection with RDL products.
