SF-1 SUBWOOFER FILTER

INTRODUCTION

The SF-1 Subwoofer Filter is an upper slot accessory for QSC MXa Series amplifiers, which feature Level One Open Input Architecture. The accessory mounts in the back of the amplifier above the standard input panel.

Ideal for adding subwoofer amplification to an existing full-range system, the SF-1 offers adjustable and selectable low-pass filtering for both channels of the amplifier, in addition to adjustable high-pass subsonic filtering. The filter slopes are 12 dB per octave, and the filter frequencies are programmable via provided SIP resistor networks.

A slide switch, SW1, allows you to configure the SF-1 with a low-end “boost” which provides a suitable equalization for use with B6 speaker enclosures. A 10-position DIP switch, SW2, affords you the versatility of setting the accessory in many different configurations, such as mono summing and single channel bypass. The configuration process is detailed below.

The use of the SF-1 for cinema subwoofer installations can reduce the chance of speaker damage by digital soundtracks. Low frequency information, below the box tuning frequency, can destroy speakers at power levels far below their rated capacity. The SF-1 can remove these damaging frequencies and also provide the needed equalization to flatten and extend the response of popular cinema subwoofers. These include: Electro-Voice models TL880D, TL550D, TL3512, TL440 and JBL 4645 and 4645B.

Existing cinema surround systems typically have limited low frequency response. New digital surround formats now have full-range surround channels that extend frequency response much lower than previous optical surround formats. The SF-1 may be used to protect surround speakers from damage, due to excessive low frequency operation. It is desirable, however, to eventually upgrade the capability of the surround systems to handle the increased power and low frequency response requirements of digital soundtracks.

25

Figure 1

Figure 1 shows where the pertinent switches, resistor networks, and connectors are located on the SF-1 board.

1

Page 2 Page 4
Page 3
Image 3
QSC Audio SUBWOOFER FILTER owner manual SF-1 Subwoofer Filter, Introduction
Page 2 Page 4

SF-1, SUBWOOFER FILTER specifications

QSC Audio SF-1 Subwoofer Filter is an innovative solution designed to enhance the audio experience in various settings, from live events to permanent installations. Tailored especially for installations that involve subwoofers, this filter serves a critical role in optimizing low-frequency performance, ensuring clarity, punch, and depth in the audio output.

One of the primary features of the SF-1 filter is its adjustable cut-off frequency. This allows sound engineers and users to fine-tune the filter settings according to their specific acoustic environment and preferences. Whether being used in a club, theater, or concert hall, the flexibility to set the cut-off frequency enables optimal integration with other system components, allowing for seamless sound reproduction.

The SF-1 is engineered with cutting-edge technologies that help reduce distortion and enhance the overall fidelity of low-frequency sound. Utilizing advanced digital signal processing (DSP), the filter can accurately manage the dynamics of low-end audio, resulting in a more controlled and impactful low-frequency response. This is particularly beneficial for subwoofers, as it prevents muddiness and ensures that bass notes remain clear and distinct even at high volumes.

Another notable characteristic of the QSC SF-1 is its robust build quality, which is essential for both touring and fixed installations. The unit is designed to withstand the rigors of regular use while maintaining reliable performance. Its compact size makes it easy to integrate into various setups without occupying excessive space.

Additionally, the SF-1 offers intuitive controls, making it user-friendly for both seasoned professionals and those new to sound engineering. The interface provides clear indicators for settings, allowing quick adjustments during live sound scenarios or installations.

In conclusion, the QSC Audio SF-1 Subwoofer Filter stands out as a powerful tool for managing low-frequency sound. Its adjustable cut-off frequency, advanced DSP technology, robust build, and user-friendly interface combine to create a versatile solution for any audio application. By ensuring enhanced audio clarity and performance, the SF-1 filter continues to be a valuable asset in the professional audio community, elevating the listening experience across various environments.
Top Page Image Contents