The RDL SF-NP50AX is a SysFlex series 50W Dante to 70/100V mono audio amplifier designed to convert one Dante input and an analog input to a constant voltage amplified output for A/V technicians, system installers, and audio engineers in office buildings, retail environments, and educational facilities. Its Class-D output stage delivers 50W of RMS power at 70 or 100V from an analog input and one Dante stream at up to 24-bit/96 kHz resolution.

A single RJ45 input accepts a Dante network audio channel while a gain-adjustable analog source may be routed to the balanced mono terminal block input or the unbalanced 3.5mm stereo mini jack. Selectable-priority automatic ducking allows attenuation or muting of the non-paging signal, making it ideal for announcements. Outputs include two terminal blocks—one accommodates connection to 70 or 100V speakers, and the other sends a balanced line-level signal. A detachable terminal block is provided for hookup of remote control of the internal VCA. Thermal and short-circuit protection guard against electrical damage and unintended shutdown.

The SF-NP50AX supports powering via the included 24 VDC external power supply (power cord available separately), or from proper wiring to the terminal block power input. Engineered and manufactured in the USA, it boasts a durable metal enclosure for reliable toughness.

Converts Dante to Constant Voltage    50W Class-D RMS Power at 70 or 100V    RJ45 Input, Gain-Adjustable Line Input    Terminal Block & Line Outputs    Supports VCA Control & Automatic Ducking    Up to 24-Bit/96 kHz Resolution    Thermal & Short-Circuit Protection    Power via Included 24 VDC Power Supply    Durable Metal Enclosure    Made in the USA

Converts one Dante network audio channel and an analog audio input to a 70 or 100V constant voltage amplified output

Provides 50 watts for a network digital audio level of 0 dBFS

Configuration requires no special software

High-efficiency Class-D output stage produces minimal heat for all levels of expected voice or music modulation

RJ45 port for Dante input

Balanced mono terminal block input

Unbalanced 3.5mm stereo mini jack automatically 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

Paging source may be the analog input or the network audio input

Ducking with adjustable threshold, automatic detection circuit, switchable priority, and selectable 25 dB attenuation or mute function

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

Supports powering via the included 24 VDC external power supply or 24V connection to the dedicated terminal block power input

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

Amplifier power is monitored and the current is limited to protect the power supply against shutting down, even during extreme feedback or square wave modulation conditions

Red rear-panel LED flashes when the SF-NP50AX reduces power consumption to prevent shutdown of the power supply

Equipped with an internal VCA for setting the output level

Detachable terminal block provides for the connection of an external 10-kOhm potentiometer or a 0 to 10 VDC control voltage

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 button (ramp or fixed-level selection) user level control

Constructed in a durable all-metal enclosure suitable for free-standing, surface-mounted, or rack-mounted operation

Engineered and manufactured in the USA for continuous duty in demanding installations

Related Questions and Answers

Q: 1. Are the 1/4 inputs balanced or unbalanced?

A: You may want to down load the data sheet or manual for the 1502. I can't say for sure but I think they are balanced.

Q: 2. The ratings for output is that RMS watts?

A: No that is peak watts.

Q: 3. Would this be a suitable amp to power a subwoofer in a small home theater setup?

A: The Crown Audio XLi 1500 Stereo Power Amplifier could potentially be used in a home theater setup, as it has both SpeakOn and RCA power outputs. However, before choosing a power amplifier it is vital to check the wattage required by the speakers you want to power.

Q: 4. Does this amplifier include the phoenix connectors for the inputs?

A: The Electro-Voice PA2250T ships with phoenix screw lock connectors for all inputs and outputs.

Q: 5. Do these get alot heat?

A: It will get warm to touch which is normal: Internal heat sinks with forced air. Fan cooled, speed regulated, thermal protection

Q: 6. How does this compare to the xls1002?

A: The XLS 1002 provides built in DSP, specifically a band pass filter per channel, an integrated crossover system, and limiters. This amp does not.

Q: 7. Can I stack one on top of the other without heating problems?

A: It is recommended to leave at least 1u of space between amps to reduce potential overheating issues

Q: 8. Could this work to power 4 Freespace DS 16F speakers? Thx

A: The Bose Professional FreeSpace DS 16F 2.25" 16W Passive Loudspeaker has transformer taps for 70V and 100V connections, as well as an 8-ohm bypass setting that specifies 16W RMS and 64W peak for each speaker. The Bose Professional FreeSpace IZA 250-LZ Integrated Zone Amplifier specifies 2 channels of speaker output offering 25W at 8 ohms, or 50W at 4 ohms. You could potentially squeeze in two DS 16F speakers on each channel if you wired them in parallel, which would create a 32W RMS load at 4 ohms. Ideally you would want to use an amplifier offering more adequate output power for this model and quantity of speakers.

Q: 9. If purchased this amp will be mounted in a television station Production Control Room. How loud is the "forced air cooling fan?

A: Crown Audio has not provided an ambient noise spec for the XLi 800 Amplifier, but with proper ventilation the variable-speed cooling fan can be kept below maximum power, thereby reducing ambient noise levels.

Q: 10. Is this Rms power or max power?

A: The wattage figures given for the Crown Audio XTi 4002 Power Amplifier are peak power levels, not RMS.