Overview
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.
Features:
- 35 Watts RMS Constant Voltage Amplifier
- 25 V, 70 V or 100 V Output
- Plenum Rated per UL 2043 Standard
- 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
Specifications
Input:
Line level (+4 dBu nominal balanced; -10 dBV nominal unbalanced)
Input Impedance:
20 kΩ balanced bridging; 10 kΩ unbalanced
Input / Output Connectors:
Detachable terminal block
Gain Adjustment:
Single turn audio taper
Minimum Input Levels:
Balanced: -14 dBu; Unbalanced: -15 dBV (to cross compressor threshold)
Maximum Input Levels:
Balanced: +22 dBu; Unbalanced: +20 dBV
Frequency Response:
50 Hz to 20 kHz (± 3 dB)
THD+N:
< 0.5% (1 kHz at compressor threshold); < 0.5% (50 Hz to 20 kHz, 1 W)
Compressor:
Threshold 2 dB below rated output, automatic adjusting attack and release times
Noise:
<-75 dB (below 35 W RMS)
CMRR:
> 60 dB (50 Hz to 120 Hz)
Output Power:
35 W RMS @ 25 V, 70 V or 100 V
Sleep Mode Power Consumption:
< 1 W (amplifier and included power supply)
Sleep Mode Delay:
5, 15 or 25 minutes (selectable)
Sleep Mode Disable:
Selectable
Active Mode Delay:
< 150 mS after input audio detected
Audio Detector Threshold:
-50 dBu balanced, -52 dBV unbalanced
Ambient Operating Environment:
0° C to 40° C Maximum; 20° C Recommended
Indicators (2):
Red LED: PEAK LED indicates compressor activity
Blue LED: Power ON, Dim: Sleep mode active; Bright: Amplifier active
Power Supply (included):
100 to 240 Vac, 50-60 Hz, 1.3 A, IEC C14; Output to module: 24 Vdc, 2 A, Ground-referenced
Plenum Rating Standard:
UL 2043
Dimensions:
Height: 2.80 in.(7.1 cm); Width: 3.25 in.(8.26 cm); Length: 6.04 in.(15.3 cm)
Package Type:
Cardboard Box
Package Dimensions:
8 x 6.5 x 3.25 in.
Shipping Weight:
3.34 lbs.
Tariff code:
8543.70.9910
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.
