RDL D-PA3, DS-PA3 Datasheet

ACCESSORIES

Models D-PA3, DS-PA3, DB-PA3

3.5 Watt Audio Amplifier

DB-PA3

DS-PA3

D-PA3

 Wall-Mounted Amplifier with 2 Inputs
 Balanced Input on the Rear Panel
 Mini-Jack Input on the Front Panel
 Automatic Switching Between Inputs
 Source Selection Using Solid-State Switching
 Front-Panel Gain Adjustment
 3.5 Watt RMS Audio Amplifier into 8 Ohms

The D SERIES-PA3 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-PA3 mounts in separately available
electrical wall boxes and cover plates.

APPLICATION: The D SERIES-PA3 is a high efficiency 3.5 W power amplifier with two line inputs and an amplified

output to drive a 4 or 8 ohm speaker. The -PA3 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 amplifier features a stereo Mini-Jack input on the front panel. The input is designed to receive standard -10 dBV
consumer level signals from sources such as a computer or personal media player. The left and right audio signals
received on the Mini-Jack are summed to mono and amplified. When a source is connected, the rear-panel input is
switched off. The amplified output level is controlled by a front-panel volume control.

A recessed slide switch on the side of the chassis is set during installation. This switch determines the sensitivity of the
balanced rear-panel input.

Amplification 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-PA3 is designed to be mounted in a wall box. The front panel does not include any illuminated indicators,
making the -PA3 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.

 6.5 Watt RMS Audio Amplifier into 4 Ohms
 Output Drives 4 or 8 Ohm Speaker
 Speaker Output on the Rear Panel
 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-PA3, DB-PA3, DS-PA3

3.5 Watt Audio Amplifier

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

Signal from Unbalanced
Line-Level Source.

+

GND

8 Ohm Loudspeaker

24 VDC
Power Source

+24

GND

+

GND

+

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

Set GAIN Switch to Match the Connected Input.
NORM (+4 dBu Balanced) or HIGH (-10 dBV Unbalanced)

GAIN

DC POWER IN

LINE INPUT

SPEAKER OUT

GAIN

D SERIES - PA3

REAR

Installation/Operation

Declaration of Conformity available from rdlnet.com.

Sole EMC specifications provided on product package.

Specifications are subject to change without notice.

Adjust Audio Level
for Desired Volume

Local Front-Panel Input
Mutes the Rear-Panel

AUDIO

INPUT

FRONT

LINE INPUT.

TYPICAL PERFORMANCE

Inputs (2): 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); -19 dBV (Unbalanced Mini-Jack, 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: 3.5 W RMS (Max., into 8 ohms); 6.5 W RMS (Max., into 4 ohms)
Frequency Response: 20 Hz to 20 kHz (± 1 dB)
THD+N: < 0.1% (@ 1 kHz, 1 W)
Noise: < -80 dB (below 1 W RMS, balanced input); < -70 dB (below 1 W RMS, Mini-Jack input)
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

891-5625

Radio Design Labs Technical Support Centers

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