INTRODUCTION- General Overview, Composilite

INTRODUCTION- General Overview

Introduction

Thank you and congratulations on your purchase of the ISIS 215PCM Powered-System Control Module or 215SB Subwoofer. This product represents the state-of-the-art in all-weather, lightweight SR (sound reinforcement) loudspeaker systems. The “215” marks the introduction of QSC’s ISIS loudspeaker systems. ISIS is short for Inte- grated, Self-Powered—Self Processed, Industrial Systems. To get the most from your investment, we encourage you to review this manual carefully.

The 215PCM is a self-contained active subwoofer system with dual 15-inch drivers. It provides power amplification not only for itself, but also two channels for driving full- range or biamp “top box” speakers as well. It is the most advanced core module for portable live sound reinforce- ment systems and is ideal for corporate and industrial events. The 215SB is a passive subwoofer system with no backpack electronics, equipped with a single Speakon™ connector.

Composilite™

QSC enclosures incorporate Composilite, a patented cored composite technology that yields superior acoustic properties, lighter weight, and greater weather resistance compared to conventional enclosure materials. Multiple skins of carbon fiber are layered over a honeycomb core to form a rigid, seamless enclosure. The extreme stiffness of Composilite construction prevents flexing of the cabinet enclosure, significantly reducing energy loss due to cabinet vibration. The result is reduced enclosure loss, increased low frequency output, and substantially less sound radiating from the back and sides of the enclosure for greater sonic accuracy. Furthermore, the enclosure’s light weight translates to safer rigging and reduced handling costs.

215SB Subwoofer Highlights

The frequency response of the 215PCM is 35 to 150 Hz (-3 dB). Two 15-inch, diametrically opposed (facing each other) drivers fire in opposite directions with equal excursion. The net effect being the driver forces counterbalance, minimizing vibration in the cabinet. This is essential in lightweight, ultra-stiff cabinet designs to keep the walls from vibrating excessively and to keep the cabinet from “walking away” during use.

215PCM Powered Control Module Highlights

The “PCM” version adds a 55 pound amplification and signal processing backpack to the 215SB subwoofer cabinet. This backpack houses two independent power amplifiers, one for the subwoofer and one for the “top boxes”. Driving the subwoofer is the equivalent of a bridged-mode PL230 amplifier providing up to 3000 watts to the two 15-inch drivers. Top boxes are powered by the equivalent of a PL236 amplifier (725 W/ch. @8 ohms, 1100 W/ch. @ 4 ohms, 1850 W/ch. @ 2 ohms). Signal processing is provided by two DSP-3 Digital Signal Processors with 24-bit, 48 kHz. convertors. Both processors have eight user- configurable and -selectable presets. An RS-232 connection to a PC running the provided QSC Signal Manager Software enables system tuning and configuration.

ISIS 215PCM specifications

The QSC Audio ISIS 215PCM is a powerful loudspeaker designed to meet the demands of professional audio applications. Known for its exceptional sound quality and robust construction, the ISIS 215PCM is engineered to deliver a superior listening experience in various settings, including live events, concerts, and installations.

One of the main features of the ISIS 215PCM is its dual 15-inch low-frequency drivers, which provide deep, resonant bass and a wide dynamic range. This design allows for high SPL (Sound Pressure Level), making it suitable for large venues. The enclosure is strategically designed to enhance performance by minimizing distortion, thus ensuring clear audio reproduction even at high volumes.

The ISIS 215PCM is equipped with a high-frequency compression driver coupled with a wide dispersion horn. This combination yields excellent high-frequency response and seamless integration with the low-frequency drivers. The dispersion pattern has been meticulously engineered, enabling consistent sound coverage throughout the audience area, which is essential in live sound applications.

In terms of technology, the ISIS 215PCM features advanced acoustic design principles that optimize both performance and durability. The enclosure is constructed from high-grade plywood and reinforced to withstand the rigors of touring and installation, while the dual ports facilitate enhanced airflow and reduced turbulence, resulting in accurate sound reproduction.

Additionally, the loudspeaker employs a sophisticated passive crossover network that effectively separates frequencies, allowing each driver to operate within its optimal range. This technology minimizes phase issues and ensures that the transitions between the low and high frequencies are smooth and natural.

Portability is another significant characteristic of the ISIS 215PCM. It includes robust handles for easy transport and installation, making it a great choice for sound engineers and technicians who need to set up and break down equipment regularly. The professional-grade connections further enhance convenience and reliability in diverse applications.

Ultimately, the QSC Audio ISIS 215PCM is a remarkable loudspeaker that combines innovative technologies, premium materials, and thoughtful design. It is ideal for audio professionals seeking a reliable solution that delivers exceptional sound quality and performance. With its versatility and robust features, the ISIS 215PCM stands out as a formidable choice for both live sound and permanent installations.