RDL SF-NP50A Datasheet

Model SF-NP50A

Network to 50 W Mono

Audio Amplier - 70 V or 100 V

y 50 Watts RMS Constant Voltage Amplifier
y 70 V or 100 V Output
y Plenum Rated per UL 2043 Standard
y Converts One Dante Network Audio Signal to a Mono Constant Voltage Output
y Selectable Dante Sample Rates: 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz
y 0 dBFS Input for 50 W Output
y Analog Balanced Mono Input or Unbalanced Stereo Mini-Jack Input
y Automatic Ducking Controlled by Network or Analog Input (Switch-Selectable)
y Ducking Attenuation -25 dB or “off” (Switch-Selectable)
y Balanced Line Output from Network Audio Source
y Automatically Limits Supply Current to Protect Against Power Supply Shutdown
y VCA Control on Detachable Terminal Block
y External Control Using 10 kΩ Potentiometer or 0 to 10 Vdc
y Compatible with RDL Remote Level Controls
y Special Software Not Required for Module Setup
y LED Indicators: Network Sync, Amplifier Mute, Analog Input Level, Ducking Threshold
y High-Efficiency Class D Operation
y Thermal and Short-Circuit Protection

The SysFlex® series is a family of A/V modules providing complex interface solutions at the click of a connector. Certain SysFlex modules provide connectorized
interface between data networks and analog and digital audio devices. Other SysFlex modules include networked and conventional amplifiers and other
application-specific solutions. In RDL’s tradition of versatility, SysFlex modules can be used right where they are needed: Rack-mounted, Surface-mounted, or
unmounted. They are light-weight, compact and easy to install with simple, straightforward switch settings and LED indicators. Modules quickly snap into the SysFlex
rack mount and each is firmly secured with a single screw. The racking system segregates network and power wiring from the audio and digital audio connectors. For
connectorized network audio endpoints and A/V system components that provide unparalleled performance and advanced features without giving up simplicity and ease
of installation, SysFlex is the industry’s best value.

APPLICATION: The SF-NP50A is an audio power amplifier that converts one Dante network audio channel and one analog input to a 70 V or 100 V

constant voltage amplified output. The output provides 50 watts for a network digital audio level of 0 dBFS. Special software is not required to
configure the module.

An analog audio source may be connected to either the mono balanced terminal block input or to the unbalanced Mini-Jack which sums the left and
right channels to mono. Input gain is set by the installer using a rear-panel single-turn potentiometer with an associated dual-LED VU meter calibrated
to 20 dB below maximum power output.

Either the analog input or the network audio input may be used as a paging source. A rear-panel switch is used to set which input has priority. That
input utilizes an automatic detection circuit with an adjustable threshold indicated by an LED to attenuate by 25 dB or mute OFF the other input as set
by a rear-panel switch. The attenuated input fades up to normal volume when the paging message is finished.

The Dante network audio source drives a balanced line-level output on a detachable terminal block to feed the inputs of other audio equipment or
power amplifiers. The output level is +4 dBu balanced for a network level of -20 dBFS.

The SF-NP50A is equipped with an internal VCA for setting the amplifier output level. A detachable terminal block provides for the connection of an

external 10 kΩ potentiometer or a 0 to 10 Vdc control voltage. RDL remote controls are available to provide single-turn, multi-turn (rotary encoder) or

pushbutton (ramp or fixed level selection) user level control. VCA control insures long term noise-free level adjustment.

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. Upon power-up and during overloads or overheating, an LED MUTE indicator glows yellow and the
output is muted. Valid synchronization to the Dante network is indicated by a green LED visible from the front of the unit.

The SF-NP50A is equipped to operate from an included external 24 Vdc power supply. The SF-NP50A monitors the amplifier power and limits the
current to protect the power supply from shutting down even during extreme feedback or square wave modulation conditions. A red rear-panel
OVERLOAD PROTECT LED flashes when the SF-NP50A reduces power consumption to prevent shutdown of the power supply.

The SF-NP50A is constructed in a durable, professional all-metal enclosure suitable for free-standing, surface-mounted or rack-mounted operation.
This full-featured SYSFLEX product is engineered and manufactured in the U.S.A for continuous duty in demanding installations. The versatility of
SYSFLEX products adds enormous flexibility in the design and installation of professional A/V systems.

RDL • 659 6th St. • Prescott, AZ., USA 86301 • [phone] • FAX [phone] • www.rdlnet.com

Model SF-NP50A

Network to 50 W Mono

Audio Amplier - 70 V or 100 V

Installation/Operation

Declaration of Conformity available from rdlnet.com.

Sole EMC specications provided on product package.
Specications are subject to change without notice.

To install the amplifier
to 1/4”- 20 all-thread
install the mounting tab
to the bottom of the unit
with the included screw.
(Position the concave
side toward the bottom
of the unit.) Attach the
all-thread through the
large hole in the mouting
tab and another piece in
the mounting hole in the
chassis flange. Secure
with nuts. (All-thread and
nuts not included)

TYPICAL PERFORMANCE

Inputs (2): Dante network (1 channel), Analog audio
Network Input Section
Network Connector: RJ45 with Link and Speed indicators
Digital Audio Ethernet Protocol: Dante
Transmission Rate: 100 Mbps
Sample Rates Supported: 44.1 kHz, 48 kHz (default), 88.2 kHz, 96 kHz
Bit Depth Supported: 24 bits
Analog Section
Analog Input Connectors (2): Balanced on terminal block or stereo unbalanced
Mini-Jack (L and R inputs summed to mono)
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)
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

Common mode rejection: > 60 dB (50 Hz à 120 Hz)
Ducking/Muting Actuation:
Ducking/Muting Release Delay: 4 seconds, nominal
Ducking/Muting Source: Switch-selectable priority for network or analog input
Ducking/Muting Level: Switch-selectable for 25 dB ducking attenuation
(nominal) or OFF

Automatic (Rear-panel adjustable signal threshold with LED indicator)

Radio Design Labs Technical Support Centers

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

891-7570A

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

Cut outs and
mounting tab may be
used to suspend the
unit above the ceiling
using hanger wire.

Reference Level (network input): 0 dBFS = 50 W
Power Amplifier Output: 50 W RMS (70 or 100 V)
Frequency Response: +0/-3 dB (50 Hz to 20 kHz)
THD+N: < 1% (1 kHz)
Noise:

Line Output: +4 dBu balanced (for -20 dBFS)
Frequency Response: +/- 0.6 dB (20 Hz to 10 kHz); +/- 2 dB (20 Hz to 20 kHz)
Noise: <-70 dB (below +4 dBu)

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
VCA: 0 to 10 Vdc control, detachable terminal block
(compatible with RDL VCA wall controls)
Ambient Operating Environment: 0° C to 40° C Maximum; 20° C Recommended
Power Requirement: 24 Vdc @ 2700 mA
Power Supply (included):
Plenum Rating Standard: UL 2043
Package Type: Cardboard Box
Package Dimensions: 10 x 7 x 2.25 in.
Shipping Weight: 4.22 lbs.
WEEE weight: 3.82 lbs.
Tariff code: 8518.50.0000

<-85 dB (below max power); <-75 dB (below 1/8 power)

100 to 240 Vac, 50-60 Hz, IEC C14; Output to module: 24 Vdc