Legacy Series - NX520P

550w, 12-inch / 1-inch Active

The NX520P uses a combination of amplifier technologies to create the best combination of lightweight enclosure and high quality sound. Capitalizing on the already popular NX20's molded cabinet technology, totally new switching power amplification and Neodymium drivers, the 550-watt bi-amped NX520P weighs in at just 42lbs (19kg) ...the lightest in its class by a longshot. This lightweight, high tech loudspeaker is a remarkable performer.



  • Ultra-light variable density acoustic foam construction
  • Dual purpose full range and wedge monitor format enclosure
  • Ultra-clear reproduction throughout bandwidth
  • Lightweight, high efficiency, high tech, 550 Watt Bi-amped power module
  • Proven TX style processing and component protection
  • +/- 6dB input trim control for individual cabinet level adjustment
  • XLR and TRS inputs / outputs for easy connection and looping
  • Multi-input source mixer for direct inputs
  • Direct microphone input with level control
  • Two way overall EQ controls
  • Light-weight 12" Neodymium Woofer
  • High quality 1" High Frequency driver
  • Next generation woofer / driver / horn technology
  • Integrated flying hardware (3/8" threaded holes)
  • Tough, full length metal grille
  • Recessed Mixer panel


The unique enclosure design means the NX520P can easily be used as a front of house PA loudspeaker, or as a wedge monitor. It comes equipped with flying hardware and has an incorporated stand mount adapter. The NX520P has incorporated some unique design ideas not seen in any other active loudspeakers, much less any active loudspeaker that performs as well as this. The loudspeaker uses a switching power amplifier for the bottom end to further reduce weight, and a two-tier class H amp for the 1" horn driver.

NX520P Active Loudspeaker

The horn amplifier uses two-tier Class H linear technology, allowing the horn to produce loud clean transients to keep up with the high output of the woofer. The two-tier amplifier technology isn't typically seen in a product like this, however we found when designing the NX520P, the advantages (lower weight, more efficiency, higher headroom and lower operating temperature) made it a perfect choice for powering the top end. A newly designed switching amplifier drives the woofer in the NX520P. This low frequency amplifier uses Class D switching technology to reduce overall weight of the amplifier section. This combination keeps distortion to a minimum while reducing the heat dissipation to a level low enough to eliminate the need for heavy heatsinks for the overall power stage.

The NX520P can easily be used in any orientation, and close to walls, floors and in close arrays with multiple cabinets. Particular care was taken designing the components to reduce extraneous heat production. We've found competitive powered speakers with large finned heatsinks need to be operated vertically and with clearance to ensure proper heat dissipation and ventilation, a problem not found in the NX520P.

We've also found an opportunity to tweak the electronics for maximum overall speaker performance and protection. Borrowing some ideas from our powerful and popular TX Series PA systems, the limiters used in the input and crossover stages are a complex combination of gain reduction and sweeping filters. As the NX520P is being pushed to its maximum input / output levels, it's advanced filtering begins rolling off unnecessary subsonic frequencies.

The filter has remarkable response times (less than 70ms), allowing the system to constantly be returning itself to make sure the output is as clean, as loud and as clear as possible at any given moment. This is achieved without negatively affecting the overall sonic quality of the cabinet. This ensures that the essential part of any mix, like the vocals or solo instruments, comes out clean and clear at the extremes of power and woofer excursion. Extremely fast and accurate limiting is in place to protect the speaker components.

NX520P Mixer Section

The NX520P has a built in mixer that allows the loudspeaker to be used directly with a tuned microphone and / or line sources such as mixer, CD player or laptop computer. The loop output allows additional powered cabinets to be driven from one cabinet's mixer stage, or a series of cabinets to be driven from one source. If desired, the end user can combine a pair of the NX520P's using the mixer inputs on each cabinet and coupling the loop outputs. In this simple example you would have the ideal presentation system with two microphone inputs, two line inputs optimized for CD, cassette or laptop computer audio source, complete within two speaker cabinets. Many NX520P's can be linked together but a maximum of three 'mixers' can be active at any one time. (Making three mic sources and six line sources available in any three or more cabinet array). The microphone input has equalization and high pass filtering appropriate for vocal applications. The trim control allows looped cabinets to be individually adjusted in level. This is valuable in applications where large numbers of cabinets are used such as clusters or in trade show applications. The NX520P has a selectable two position high-pass filter to limit extraneous low frequency rumble, or to crossover at the input so the loudspeaker can easily and effectively be used with subwoofers from a single full range source. Engaging the high pass filter also makes the NX520P a more efficient and effective vocal monitor.

The NX520P is an ideal loudspeaker for mobile presentation PA where high volume and superior sound quality is required. Multiple loudspeakers can easily be linked using mixer inputs from each loudspeaker to create a six input system... no external mixer required. (Up to three 'mixer' sources can be used in any one system.)

With the optional steel U-Bracket flying assembly (NXF100) the NX Flyware System can also be utilized for either wall mounting (using the NXF105 Wall Mount Bracket) or flown as a linked array system (with the NXF110 Array Link Assembly) allowing up to six cabinets for a full, circular array.


System Type 2-Way
Active or Passive Active
Power Rating (Watts) 550
Biampable Self Powered
Biamp Operation Only Yes
Max SPL (dB) 124
Frequency Response (Hz +/- 3dB) 65 - 18k
Crossover Frequency (Hz) 2500
Driver Configuration 12 inch / 1 inch
HF Driver(s) 1 inch Throat, Ceramic Magnet, 1 inch Mylar voicecoil
HF Power Rating (Watts) 100
HF Dispersion (°H x °V) 90 x 60
LF Driver(s) 12 inch Neodymium Magnet 3 inch voicecoil
LF Power Rating(Watts) 450
Total Power (Watts) 550
HF Amplifier Type Two Tier Class H
LF Amplifier Type Class D
Power Cable Yes
Power Switch Yes
Inputs 7
Inputs - 1/4" Jacks 2 (line input) 2 (link in/out)
Inputs - XLR 1 (mic) 2 (line in/out)
Input Sensitivity (Vrms Sine) +4dBv / 1.23V (+/-6dB with trim control)
Mixer Controls Mixer on/off switch
Mic Gain
Line/CD Gain
Treble/Bass Tweak
Level Controls +/- 6dB Main Volume
EQ Controls 100Hz HP Filter (LF Rolloff)
Limiter Yes
LED Indicators Power/Clip/Limit
Bar Handles 1 (Side)
Flying Hardware 2 (Top), 2 (Bottom), 1 (Pullback)
Pole Mount Adapter (1 3/8"-3.5cm) Yes
Enclosure Materials Variable Density Molded Composite
Grille Perforated Metal
Dimensions (DWH xbackW, inches) 14 x 16 x 24 x 7.5
Dimensions (DWH xbackW, cm) 36 x 41 x 61 x 19
Weight (lbs/kg) 43 / 19.6

Specifications subject to change without notice