FLAT-PAK
™
SERIES
Model
FP-PA35A
35 W Audio Power Amplifier
with Power Supply
35 Watts RMS Constant Voltage Amplifier
25 V, 70 V or 100 V Output
Automatic Energy-Saving Sleep Mode
Selectable Sleep Delay: Off, 5, 15, 25 Minutes
Input / Output Terminal Block Connections
Line Level Balanced or Unbalanced Input
Compressor/Limiter Controls Clipping
LED to Indicate Audio Compression Threshold
Compressor Produces Maximized Average Output Power
Audio Quality Superior to Standard Amplifiers
Ultra-compact All Metal Construction
High-Efficiency Class D Operation
Thermal and Short-Circuit Protection
The FP-PA35A is part of the group of versatile FLAT-PAK products from Radio Design Labs. The unique FLAT-PAK case can be directly screwed
or bolted to cabinets or shelves. Optionally available rack-mounting accessories permit single or multiple FLAT-PAK module mounting.
APPLICATION:
The FP-PA35A is the ideal choice in many applications where multiple 25 V, 70 V or 100 V speakers in a
zone need to be powered from a single audio power amplifier.
The FP-PA35A features a balanced line level input that may be connected unbalanced. A front panel gain control is
designed to be adjusted manually or with a trimming screwdriver. The gain range will accommodate standard unbalanced
levels as well as professional balanced levels. Multiple distributed sound system speakers connect to the corresponding
25 V, 70 V or 100 V amplified output.
The FP-PA35A includes an analog compressor/limiter for audio fidelity audibly superior to conventional class D amplifiers
with digital limiting. The input
GAIN
setting determines whether the limiter alone is used for clipping suppression, or if the
full compressor/limiter will be used to substantially increase the average output power beyond that of a standard 35 W
amplifier. A red
COMPRESSION
LED flashes when the limiter is preventing output clipping. Normal audio level signals
remain unaffected by the compressor thereby preserving audio dynamics. If the input level is increased so that the
compressor is active, the LED remains dimly lit between peak flashes. The audio is compressed according to three
dynamic time constants providing aural transparency while maintaining clean, unclipped amplified audio for input overloads
of up to 20 dB. The FP-PA35A, with compression, is capable of producing average audio output levels and clarity normally
expected from amplifiers with a much higher output power rating.
The FP-PA35A circuits are all designed for low power consumption. In the absence of an audio input, a digital timer is
enabled to switch the class D output stage off. When this sleep mode is active, the amplifier module and its included RDL
power supply consume less than 1 W of mains power. A front-panel control sets the sleep mode delay timer to 5, 15 or 25
minutes. The control also permits the installer to bypass the sleep mode to conform to system specifications that require
the amplifier to be active at all times. Upon detection of an input signal, the amplifier is nearly inaudibly and instantly
restored to full operation within 150 milliseconds.
A blue
POWER
LED illuminates when the FP-PA35A is powered from its external 24 Vdc power supply. The power LED is
dimly illuminated when the sleep mode disables the amplifier and glows brightly when the amplifier operation is fully
enabled. The module is equipped with both thermal and output short-circuit protection. The high-efficiency Class D output
stage produces minimal heat for all levels of expected voice or music modulation. Continuous full-power operation with
audio tones will not damage the amplifier, but is not recommended.
Wherever an ultra-compact, high quality, high efficiency eco-friendly audio power amplifier is needed to provide reliability
and unsurpassed versatility, the FP-PA35A is the ideal choice. Use the FP-PA35A individually, or combine it with other
RDL products as part of a complete audio/video system.
RDL
659 6
th
St.
Prescott, AZ., USA 86301
(928) 443-9391
FAX (928) 443-9392
www.rdlnet.com