The One Systems SF-4 is a high-quality, high-order analog high-pass filter system. The SF-4 consists of four user-selectable 4th-order Butterworth high-pass filters. The SF-4 is a line level device designed for use in professional sound reinforcement systems immediately prior to the main power amplifier.
All sound reinforcement speaker systems need high-pass filtering in order to deliver maximum performance. The basic function of a high-pass filter is to limit low frequency signals that are below the loudspeaker's tuning frequency. Filtering these low frequency signals substantially improves loudspeaker reliability, increases power handling and reduces system distortion. In addition to improving loudspeaker performance, high-pass filters also increase the power amplifier's headroom by reducing the power required to reproduce subsonic input signals.
The SF-4's high-pass filter frequencies are 35 Hz, 45 Hz, 60 Hz and 80 Hz. Although these frequencies were selected to deliver optimum performance with One Systems models, other speakers brands and models can also benefit from the use of the SF-4.
To ensure maximum system flexibility, the SF-4 delivers +6 dB output so that it can be used to drive long output cable lines while still delivering low noise. The SF-4 also features a universal power supply that allow it to be switched between 120 and 240-volt operation, 50 - 60 Hz.
Use of the SF-4 will ensure the highest possible system reliability as well as maximum headroom. The cost-effective SF-4 is easy to set up and use.
User-selectable high-pass filter with high-quality analog circuitry
Choice of four filter frequencies to match a wide range of speaker types. Selectable filters at 80 Hz, 60 Hz, 45 Hz and 35 Hz
4th-order, 24-dB-per-octave Butterworth filters
True active-balanced input and output circuitry for maximum output and lowest noise
Rear-mounted controls minimizes control tampering
Switchable 115 / 230-volt power supply permits use nearly anywhere
+6 dB output voltage ensures the capability of driving long cable runs
Proper high-pass filtering maximizes speaker system performance, increases headroom and improves reliability for all loudspeakers
amplifiers
Amplifiers
Spec Sheet available - Yes
Frequency Response:
Selected HP cutoff - 20,000 Hz
Frequency Response:
Selected HP cutoff - 20,000 Hz
INPUT:
Active balanced (pin 2+)
Max. Input Level:
18 dBV (8 V rms)
Output:
Active balanced pin 2+
Input Connector:
3-pin XLR-type
Output Connector:
3-pin XLR-type
Selectable HF Filter Frequencies:
35, 45, 60 and 80 Hz
Filter Type:
4th order Butterworth 24-dB-per-octave