Configuration

SETTING THE SUBSONIC FILTER FREQUENCY

The subsonic (highpass) filter on Channel 1 cannot be bypassed, and Channel 2 should only be bypassed in the bridged mono mode. Plug-in SIP resistor network RN3 sets the high-pass frequency for both channels 1 and 2. Table 2 shows the resistor value to be used for the frequency you desire. Typical subsonic frequencies available with the provided SIP resistor networks are 20, 25, 32, 35, 40, 50, 63, and 80 Hz. Consult your subwoofer manufacturer if you are unsure of what frequency to use.

If you desire a 6-dB boost at the low end of the subwoofer frequency range, set the slide switch SW1 to “ON”; otherwise set it to “OFF.” Such a boost is popular with users of Electro-Voice B6 subwoofer enclosures.

		TABLE 2

Frequency	Resistor Network Value (RN3 or RN4)

20	82K	Factory set for RN3

25	68K
32	56K
35	47K

40	39K
50	33K

63	27K

80	20K
100	18K

135	12K

160	10K
200	8.2K

250	6.8K Factory set for RN4

SETTING THE SUBWOOFER UPPER FREQUENCY LIMIT

The low-pass filter sets the upper limit of the subwoofer frequency range. Plug-in SIP resistor network RN4 sets the low-pass frequency for both channels 1 and 2. Table 2 shows the resistor value to be used for the frequency you desire. Typical frequencies available with the provided SIP resistor networks are 100, 135, 160, 200, and 250 Hz. Consult your subwoofer manufacturer if you are unsure of what frequency to use. Whatever frequency you choose should be higher than that of the subsonic filter.

SETTING DIP SWITCH SW2

Determine the configuration you desire and set the DIP switches as described below.

Positions 1 through 4 and 9 and 10

First, decide whether you need “Mono Sum” or “Stereo” operation. This will determine the settings of positions 1 through 4 and 9 and 10 of DIP switch SW2.

•Mono Sum

Because it is difficult for listeners to sense directionality of low audio frequencies, many subwoofer systems are set up for monaural operation, with both channels summed together. For mono summed operation, set the amplifier mode switch to “STEREO” and SW2 as follows:

Position 1	OFF
Position 2	ON
Position 3	ON
Position 4	OFF
Position 9	OFF
Position 10	ON

Continue to “Positions 5 through 8” and set those switches to engage both channels’ low-pass filtering.

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.