RDL DB-HPA3, D-HPA3, DS-HPA3 Datasheet

ACCESSORIES

Models D-HPA3, DS-HPA3, DB-HPA3

3.5 Watt Audio Power and Headphone Amplifier

DB-HPA3

DS-HPA3

D-HPA3

 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

The D SERIES-HPA3 is part of the group of versatile accessory products from Radio Design Labs. These modules combine durable
construction with high quality components and attractive, professional graphics. The D SERIES-HPA3 mounts in separately available
electrical wall boxes and cover plates.

APPLICATION: 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.

 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

RDL  659 6th St.  Prescott, AZ., USA 86301  [phone]  FAX [phone]  www.rdlnet.com

ACCESSORIES

Models D-HPA3, DB-HPA3, DS-HPA3

3.5 Watt Audio Power and
Headphone Amplifier

Signal from Balanced
Line-Level Source.
(May be Wired
Unbalanced)

Signal from Unbalanced
Line-Level Source.

8 Ohm Loudspeaker

+

GND

24 VDC
Power Source

+24

GND

+

GND

+

GAIN MUTE

NORM (+4 dBu)
HIGH (-10 dBV)

AB

DC POWER IN

LINE INPUT

SPEAKER OUT

SWITCHES

AB

D SERIES - HPA3

REAR

Set GAIN Switch to Match the Connected Input.
NORM (+4 dBu Balanced) or HIGH (-10 dBV Unbalanced)
and Set MUTE Switch to ON or OFF. MUTE ON Shuts the
Speaker off When Headphones are Connected.

ON
OFF

Installation/Operation

Sole EMC specifications provided on product package.

FRONT

Declaration of Conformity available from rdlnet.com.

Specifications are subject to change without notice.

Adjust Audio Level
for Desired Volume

Headphone Output may be
Set to MUTE the SPEAKER
OUTPUT.

TYPICAL PERFORMANCE

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

Radio Design Labs Technical Support Centers

U.S.A. [phone], [phone]; Fax: [phone]

891-5620

Europe [NH Amsterdam] (++31) 20-6238 983; Fax: (++31) 20-6225-287