Power Limiter Tracking, When to use it | QSC Audio PL224A, PL230A

FEATURES & SETUP- SIDE PANEL SWITCHES: CLIP LIMITER

POWER LIMITER TRACKING- continued

The high frequency driver requires a lower power threshold and fast limiting response. Try the FAST setting and the PEAK mode. Short peaks will be limited aggressively, but signals will return to normal almost instantly. This response (fast with low threshold) would have too much “ducking” and low frequency distortion for use with full range material.

Once each driver has optimal protection, you need to make them work properly together. When only one channel is limiting, the frequency balance will be upset. This may not be a problem with some material, but testing is required. The different tracking “modes” offer different solutions. For example, if the crossover frequency is low, both drivers may have similar power capacities and protection speed requirements. For this type of bi-amping, you may find that “mode” 4 (stereo tracking, below) offers the best sound performance.

Experimentation with the actual speakers is needed.

4- Each channel tracks the other (stereo tracking)--switch section 9 of both channel’s limiter adjustment DIP switches should be set to the right (TRACKS CH 2 and TRACKS CH 1). Stereo playback usually uses matched speakers and thus if one channel limits, it will effect the image and placement of the instruments. When each channel tracks the other, any limiting on one channel causes limiting on the other, preserving the overall “balance” while protecting the speakers. The power threshold and speed settings for each channel should be matched.

CLIP LIMITER: The PL2A amplifier also has separate limiters which respond only to amplifier clipping. These may be used with or without the adjustable Power Limiters.

When the audio signal drives the amp's output circuit beyond its power capability, the amp clips and flattens the peaks of the waveform. The clip limiter detects this and quickly reduces the gain to minimize the amount of overdrive. To preserve as much of the program dynamics as possible, limiting occurs only during actual clipping.

Each channel has its own clip limiter that can be switched on or off independently, as shown at right.

When to use it-

When driving full-range speakers, clip limiting reduces high frequency distortion caused by bass overloads. It also protects high frequency drivers from excess overdrive and harsh clipping harmonics.

We recommend using the clip limiters in all applications.

Clip limiter switches are at the bottom of each LIMITER ADJUSTMENT DIP switch (1 per channel)

NOTE: After all side panel switches have been set and SIP resistor networks installed, verify your setup and reinstall the side cover plate to keep dirt, dust, and foreign objects from entering the chassis.

CAUTION: Clip limiting reduces extreme overdrive peaks, allowing a higher average signal level without audible distortion. However, increasing the gain with the clip limiter engaged, until clipping is again audible, can double the average output power. Be careful not to exceed the power rating of your speakers.

PL224A, PL236A, PL218A, PL230A specifications

QSC Audio is known for its high-quality professional audio equipment, and the PL series amplifiers are no exception. The PL236A, PL230A, PL218A, and PL224A are designed to meet the demands of live sound applications, touring, and installations, providing powerful, reliable, and efficient performance.

The PL236A is a versatile power amplifier capable of delivering 800 watts per channel at 4 ohms, making it suitable for a variety of applications. It utilizes Class H technology, which boosts efficiency while minimizing heat generation, allowing for cooler operation and longer lifespan. The PL236A is equipped with QSC's Advanced Thermal Management technology, featuring variable-speed fans that adjust to the temperature, ensuring optimal performance under various conditions.

The PL230A is another exceptional model in the series, offering 600 watts per channel at 4 ohms. This amplifier is perfect for smaller systems or as part of a larger configuration. Its compact design makes it easy to transport, while its robust construction guarantees durability in demanding environments. Like the PL236A, it is also designed with Class H architecture and Advanced Thermal Management, providing both efficiency and reliability.

For those in need of sub-bass reinforcement, the PL218A is a dual 18-inch subwoofer amplifier that provides significant power output, reaching up to 2400 watts at 4 ohms. Its design focuses on low-frequency performance, ensuring that it can handle even the most demanding bass signals without distortion. The PL218A incorporates QSC’s patented Power Factor Correction technology, ensuring optimal energy consumption and minimizing electrical load.

Finally, the PL224A is a dual-channel amplifier with 1200 watts per channel at 4 ohms, designed with flexibility and scalability in mind. It is perfect for driving full-range systems or can be combined with additional amplification for larger setups. The PL224A features a comprehensive limiter section that protects speakers from over-excursion and ensures clean audio output.

All models in the QSC PL series come with user-friendly rear panel controls for easy setup and operation, along with input XLR connectors and speakON outputs for secure and efficient connections. The amplifiers also feature a robust chassis design for enhanced durability, and their lightweight construction allows for easy transport and installation.

In summary, the QSC PL236A, PL230A, PL218A, and PL224A amplifiers exemplify modern audio technology, offering powerful performance, flexibility, and reliability for a variety of professional audio applications. With their robust design and advanced features, these amplifiers are ideal for sound reinforcement in live settings and permanent installations alike.