RDL DB-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

AUDIO

EN55103-1 E1-E5; EN55103-2 E1-E4

Typical Performance reflects product at
publication time exclusive of EMC data, if any,
supplied with product. Specifications are
subject to change without notice.

Adjust Audio Level
for Desired Volume

Local Front-Panel Input
Mutes the Rear-Panel
LINE INPUT.

INPUT

FRONT

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

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

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