Radio Design Labs RDL-SF-NP35E

Availability: Available Unavailable

Product Type: Pro Audio

Product Vendor: Radio Design Labs

Product SKU: RDL-SF-NP35E

Overview The SF-NP35E is an audio power amplifier that converts one Dante network audio channel to a 70 V or 100 V constant voltage amplified output. The output provides 35 watts for a network digital audio level of 0 dBFS....

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ATTENTION! TARIFFS AND INDUSTRY IMPACT: All Pricing is subject to change without notice due to industry wide Tariff increases with several major manufacturers. Please check with your sales rep for current and updated pricing information prior to ordering. Quotes are only valid for the day they are provided. Returns for credit - New product may be approved to be returned for credit within 30 days of original packaging. Product must be new, unopened and in original packaging Returns and canceled orders are subject to a 25% restocking fee. -MANY ITEMS ARE CURRENTLY ON BACKORDER. PLEASE VERIFY PRICING AND AVAILABILITY ON ALL PRODUCTS WITH YOUR SALES REP VIA CHAT, EMAIL, OR PHONE BEFORE PLACING AN ORDER

Product Details


The SF-NP35E is an audio power amplifier that converts one Dante network audio channel to a 70 V or 100 V constant voltage amplified output. The output provides 35 watts for a network digital audio level of 0 dBFS. Special software is not required to configure the module.

The SF-NP35E is equipped to operate from a PoE++ enabled network switch. The SF-NP35E may be powered from an external 24 Vdc power supply, available separately.

If a PoE++ powered device instantaneously demands excessive power from a PoE++ port, that port can shut off its output voltage, causing a prolonged disruption of the device operation. The SF-NP35E monitors the amplifier power and limits the current to protect the PoE++ port against shutting down even during extreme feedback or square wave modulation conditions. A red rear-panel PORT PROTECT LED flashes when the SF-NP35E reduces power consumption to prevent shutdown of the PoE++ port voltage.

The SF-NP35E is equipped with an internal VCA for setting the output level. A detachable terminal block provides for the connection of an external 10 K? potentiometer or a 0 to 10 Vdc control voltage. The amplifier gain remains at maximum when the VCA input terminal is not connected. 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. An LED MUTE indicator glows yellow when 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-NP35E 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.


  • 35 Watts RMS Constant Voltage Amplifier
  • 70 V or 100 V Output
  • Converts One Dante Network Audio Signal to a Mono Constant Voltage Output
  • Selectable Dante Sample Rates: 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz
  • 0 dBFS Input for 35 W Output
  • Automatically limits supply current to protect against PoE++ port shutdown
  • VCA Control on Detachable Terminal Block
  • External Control Using 10 K? Potentiometer or 0 to 10 Vdc
  • Compatible with RDL Remote Level Controls
  • Special Software Not Required for Module Setup
  • LED Indicator for Network Sync
  • High-Efficiency Class D Operation
  • Thermal and Short-Circuit Protection
  • Plenum Rated per UL 2043 Standard


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
Reference Level 0 dBFS = 35 W
Power Amplifier Output 35 W RMS (70 or 100 V)
Frequency Response +0/-3 dB (50 Hz to 20 kHz)
THD+N < 1% (1 kHz)
Noise <-90 dB (below max power); <-80 dB (below 1/8 power)
Indicators (3) Front-panel: Sync (green), Amplifier muted (yel), Rear-panel: Port Protect (red), Ethernet Link and Speed (2)
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 @ 2000 mA, or PoE
PoE Class 4, IEEE 802.3at (PoE++, 4 pairs)
Plenum Rating Standard UL 2043
Dimensions Height: 1.7 in. (4,32 cm); Width: 5.83 in. (14,8 cm); Depth: 6.45 in. (16.38 cm)
Package Type Cardboard Box
Package Dimensions 9.5 x 7 x 2.25 in.
Shipping Weight 3.33 lbs.
WEEE weight 2.97 lbs.
Tariff code 8518.50.0000

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