FEATURES & SETUP- SIDE PANEL SWITCHES: POWER LIMITER (continued from previous page)

FAST- Set both POWER LIMITER SPEED switches to FAST. This setting produces 20 milliseconds (0.020 seconds) of release time. The AVG mode will produce 8 milliseconds of attack time, and PEAK mode will produce less than 1 millisecond of attack time. This setting will have low distortion down to about 1 kHz. It is suitable for high frequency protection, but will cause a distinctly “muddy” effect when used on full range material.

MED- Set the upper POWER LIMITER SPEED switch to MED and the lower switch to FAST. This setting produces 200 milliseconds of release time. The AVG mode produces 80 milliseconds of attack time and the PEAK mode produces 10 milliseconds of attack time. This setting is the fastest possible setting for full range material and may still produce some IM distortion for extremely low frequencies.

SLOW- Set the lower POWER LIMITER SPEED switch to SLOW and the upper switch to FAST. This setting provides 4 seconds of release time. The AVG mode produces 1.6 second of attack time and the PEAK mode produces 180 milliseconds of attack time. This setting will change the gain very gradually in the AVG mode, and sudden peaks may clip for 1 to 2 seconds. The PEAK mode will push overloads down quickly, but recovery time will still take many seconds.

POWER LIMITER TRACKING- Each channel’s power limiter operates independently, with its own threshold and time constants.

Four tracking modes are available for your use:

1- No Tracking--switch section 9 of both limiter adjustment DIPs should be set to OFF. This is the “usual” mode where neither channel’s limiting effects the other.

2- CH 1 tracks the limiter activity of CH 2--switch section 9 of channel 1’s limiter adjustment DIPs should be set to TRACK CH 2 and switch section 9 of channel 2’s limiter adjustment DIPs should be set to OFF. This tracking mode is not often used, but is applied to paging environments with high ambient noise levels. Limiting on channel 2 will cause limiting to occur on channel 1. Channel 2 is set up for a vocal-range horn and carries the voice page; its limiter is set for MED speed and PEAK mode with a power threshold and gain setting that produces proper paging level. Channel 1 is set up for a full-range music speaker with its level set for comfortable listening against the ambient noise. When a page drives channel 2 into limiting, channel 1 is driven “down” also, making the page more audible against the background noise. Some experimentation with channel 2’s gain and threshold will be required for best performance with a range of paging voices & levels.

3- CH 2 tracks the limiter activity of CH 1 (bi-amp tracking) --switch section 9 of channel 2’s limiter adjustment DIPs should be set to TRACK CH 1 and switch section 9 of channel 1’s limiter adjustment DIPs should be set to OFF. This tracking mode is useful for high frequency bi-amping , using fast protection on the horn without “ducking” the low frequencies. When used carefully, this mode can protect each driver in a two-way system , while preserving musical dynamics and balance.

We offer the following suggestions as a starting point for bi-amp tracking:

TWO-WAY SPEAKER WITH A FAIRLY HIGH CROSSOVER FREQUENCY- Most of these systems have a large cone low frequency driver and a comparatively delicate high frequency driver. The limiting is tailored for each driver; higher power threshold and slower limiter speed for the low frequency driver and a lower power threshold and faster limiter speed for the high frequency driver.

The low frequency driver can handle short time overloads, so its limiter can be set to the slower responding AVG (average) mode with MED to SLOW overall limiting times. Short peaks may clip, but the overall limiting will be smooth and gradual with no low frequency distortion and a minimum of “ducking”. If there is too much clipping, try the CLIP LIMITER or use the PEAK mode and MED speed.

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QSC Audio PL236A, PL230A, PL218A, PL224A user manual Four tracking modes are available for your use
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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.
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