The SF-PA100A is a compact, high-performance audio power amplifier designed to handle three audio channels via an RJ45 Format-A connector. It offers 70V or 100V constant voltage output, delivering 100 watts at +22 dBu with a selectable audio input. The amplifier includes loop-out functionality to connect additional amplifiers or receivers.

Gain adjustment is made via a rear-panel single-turn potentiometer and dual-LED VU meter. The amplifier also features internal VCA control for precise, noise-free level adjustments, with remote control capability through an RJ45 jack for external level control devices.

A built-in audio compressor adds up to 15 dB of headroom while maintaining transparency with automatic attack and release times. The SF-PA100A also includes thermal and short-circuit protection and utilizes a Class D output stage for efficient operation and minimal heat production. The unit operates from an included 48 Vdc external power supply.

Housed in a durable all-metal enclosure, the SF-PA100A is suitable for free-standing, surface-mounted, or rack-mounted installations. Designed for demanding professional A/V systems, this SYSFLEX amplifier is engineered for continuous duty and versatility.

Features

100 Watts RMS constant voltage output (70 V or 100 V)
Plenum rated per UL 2043 standard
Input switch-selectable from Format-A Pair A, Pair B, or Pair C
Converts Format-A audio signal pair to mono constant voltage output
Passes through Format-A signal and power pairs to LOOP OUT jack
External level control with RDL D-RLC10KM-type remote control via RJ45
No special software required for module setup
LED indicators for amplifier output level, status, and correct dc voltage
Three input channels via RJ45 Format-A connector
Loop-out functionality for cascading amplifiers or receivers
Rear-panel gain adjustment with VU meter
VCA control for noise-free level adjustments
Selectable audio compressor adds 15 dB headroom
Thermal and output short-circuit protection
Efficient Class D output stage
Operates on an external 48Vdc power supply
Durable, all-metal enclosure suitable for flexible installation
Engineered for continuous duty in professional A/V systems

Specifications

Input: RDL TP Format-A
Input Connection: RJ45
Format-A Signal Pairs: A, B, or C (selectable via 3-position switch)
Format-A Output: RJ45 (loop-through)
CMRR: > 80 dB (50 Hz to 150 Hz)
Headroom Above +4 dBu Input: > 18 dB
Amplifier Section
- Power Amplifier Output: 100 W RMS (70V or 100V)
- Frequency Response: +0/-3 dB (50 Hz to 20 kHz, -0.25 dB typical at 20 kHz)
- THD+N: < 1% (100 W)
- Noise: < -85 dB (below max power); < -75 dB (below 1/8 power)
- Audio Metering: Dual-LED VU meter, calibrated to 10 dB below full output
- Compressor: Selectable (IN/OUT), Threshold 2 dB below rated output, automatic adjusting attack and release times, adds 15 dB headroom
- Gain Adjustment: Single-turn audio taper (sets max gain)
- VCA Control: RJ45, 0 to 10 Vdc (compatible with RDL D*-RLC10M type wall controls)
Indicators
- Front Panel: Ready (green), Overload Shutdown (red)
- Rear Panel: Dual-LED VU meter (2), Format-A Power (green)
Environmental
- Operating Temperature: 0° C to 50° C
Power Supply
- Included: 100 to 240 Vac, 50-60 Hz, IEC C14
- Output to Module: 48 Vdc
- Plenum Rating Standard: UL 2043
Dimensions
- Height: 1.68 in. (4.27 cm)
- Width: 8.71 in. (22.12 cm)
- Depth: 7.8 in. (19.81 cm)

Other Details

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.

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RDL SF-PA100A Format-A to 100W Mono Audio Amplifier, 70/100V

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RDL SF-PA100A Format-A to 100W Mono Audio Amplifier, 70/100V

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