RDL SF-NP50A – 50 W Dante 70 V/100 V Amplifier
RDL SF-NP50A – 50 W Dante 70 V/100 V Amplifier is backordered and will ship as soon as it is back in stock.
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RDL SF-NP50A – 50 W Dante 70 V/100 V Amplifier
What is the RDL SF-NP50A?
The RDL SF-NP50A is a SYSFLEX 50 W constant-voltage amplifier that converts a Dante network channel and an analog input to a 70 V or 100 V speaker output. Built-in automatic ducking, VCA level control and a balanced line output make it a compact zone amplifier for paging and background music. It is plenum rated per UL 2043 and includes its external power supply.
How does it work?
The amplifier delivers 50 W for a network digital audio level of 0 dBFS. An analog source can connect to the balanced terminal block input or to an unbalanced Mini-jack that sums left and right to mono. Input gain is set with a rear-panel potentiometer and a dual-LED VU meter. Either the analog or the network input can be the paging source, and an automatic detector with adjustable threshold attenuates the other input by 25 dB or mutes it, then fades it back up when the page ends. The Dante source also drives a balanced +4 dBu line output on a terminal block for feeding other amplifiers. An internal VCA sets the output level and accepts an external 10 kΩ potentiometer or 0 to 10 Vdc, so RDL remote level controls can be used. Dante sample rates of 44.1, 48, 88.2 and 96 kHz are selectable without special software. The high-efficiency Class D stage includes thermal and short-circuit protection and automatically limits supply current to prevent supply shutdown. The included supply accepts 100 to 240 Vac and provides 24 Vdc to the module.
What are the key features?
- 50 W constant voltage — Drives 70 V or 100 V speaker lines.
- Dante and analog inputs — One Dante channel plus a balanced or Mini-jack analog input.
- Automatic ducking — Network or analog priority with -25 dB or off attenuation.
- VCA level control — External 10 kΩ potentiometer or 0 to 10 Vdc control.
- Balanced line output — Passes the Dante source to other equipment at +4 dBu.
- Plenum rated — UL 2043 rated with Class D efficiency and thermal protection.
Where is it typically used?
- Commercial paging and background music zones
- Conference rooms and training rooms
- Houses of worship
- Government facilities
- Retail and hospitality spaces
Technical Specifications
| Shipping Weight | 4.22 lbs. |
| Dimensions | Height: 1.7 in. (4,32 cm); Width: 5.83 in. (14,8 cm); Depth: 6.45 in. (16.38 cm) |
| Plenum Rating Standard | UL 2043 |
| Ambient Operating Environment | 32° F to 104° F (0° C to 40° C) Maximum; 20° C Recommended |
| Power Requirement | 24 Vdc @ 2700 mA |
| Power Supply (included) | 100 to 240 Vac, 50-60 Hz, IEC C14; Output to module: 24 Vdc |
| VCA | 0 to 10 Vdc control, detachable terminal block (compatible with RDL VCA wall controls) |
| Indicators (8) | Front-panel: Sync (green), Amplifier muted (yel), Rear-panel: Overload Protect (red), Ethernet Link and Speed (2), dual-LED VU meter (2), Ducking threshold |
| Noise | <-70 dB (below +4 dBu) |
| Frequency Response | +/- 0.3 dB (20 Hz to 10 kHz); +/- 2 dB (20 Hz to 20 kHz) |
| Line Output | +4 dBu balanced (for -20 dBFS) |
| Noise | <-85 dB (below max power); <-75 dB (below 1/8 power) |
| Frequency Response | +0/-3 dB (50 Hz to 20 kHz) |
| THD+N | < 1% (1 kHz) |
| Reference Level (network input) | 0 dBFS = 50 W |
| Ducking/Muting Source | Switch-selectable priority for network or analog input |
| Ducking/Muting Level | Switch-selectable for 25 dB ducking attenuation (nominal) or OFF |
| Power Amplifier Output | 50 W RMS (70 or 100 V) |
| Ducking/Muting Release Delay | 4 seconds, nominal |
| Ducking/Muting Actuation | Automatic (Rear-panel adjustable signal threshold with LED indicator) |
| Common mode rejection | > 60 dB (50 Hz à 120 Hz) |
| Gain Adjustment | Single turn audio taper (with associated Dual-LED VU Meter calibrated to 20 dB below full output power) |
| Input Impedance | >10 kΩ balanced, >5 kΩ unbalanced |
| Balanced Input Level | +4 dBu nominal, adjustable; -10 dBu minimum (for 20 dB below full output power); +25 dBu maximum (before clipping) |
| Unbalanced Input Level | -10 dBV nominal, adjustable; -25 dBV minimum (for 20 dB below full output power); +10 dBV maximum (before clipping) |
| Analog Section | |
| Analog Input Connectors (2) | Balanced on terminal block or stereo unbalanced Mini-Jack (L and R inputs summed to mono) |
| Bit Depth Supported | 24 bits |
| Inputs (2) | Dante network (1 channel), Analog audio |
| Network Input Section | |
| Digital Audio Ethernet Protocol | Dante |
| Network Connector | RJ45 with Link and Speed indicators |
| Transmission Rate | 100 Mbps |
| Sample Rates Supported | 44.1 kHz, 48 kHz (default), 88.2 kHz, 96 kHz |
Frequently Asked Questions
What speaker systems does the SF-NP50A drive?
70 V or 100 V constant-voltage speaker systems, at up to 50 W RMS.
Is a power supply included?
Yes. The SF-NP50A includes an external supply rated 100 to 240 Vac that provides 24 Vdc to the module.
Can it prioritize pages over music?
Yes. Either the analog or the Dante input can be set as priority, and the other input is attenuated by 25 dB or muted while a page is detected.
Can it be installed above a ceiling?
RDL lists the SF-NP50A as plenum rated per UL 2043. Confirm local code requirements for your installation.
Does it need configuration software?
No. RDL states special software is not required for module setup.
What warranty does the SF-NP50A carry?
This product is covered by a 7-year RDL warranty. For warranty claims, RMAs or support, contact Creation Networks at (888) 230-3661 or sales@creationnetworks.net.
Can Creation Networks help design and commission the system?
Yes. Our team handles networked audio design, equipment selection, installation and commissioning for commercial projects nationwide. Call (888) 230-3661 to discuss your project.
At Creation Networks, we do everything we can to create an excellent customer experience. This includes fast shipping and easy returns.
- Most in-stock orders placed Monday-Friday ship within 24-48 hours. General restrictions apply; please see our full shipping policy here.
- We offer a 30-day return policy from the delivery date on many products. Product restrictions apply. Restocking fees for the return of open-box items. Please see our full return policy here for more information.
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