The SF-3 subwoofer filter allows the addition of subwoofers to an existing
full-range system, offering adjustable low-pass filtering and high-pass
subsonic filtering with optional B6 boost and mono-summing.
The unit mounts to the rear panel of a two-channel DCA, CX, or ISA amplifier to
save cost and rack spack. The amplifier’s DataPort provides the accessory's
operating power and receives the output signals, eliminating added
external wiring or power transformers.
For subwoofer material derived from full-range audio, a 4th-order Linkwitz-Riley
low-pass filter lets you set the upper range of the subwoofer band
to 80, 150, or 250 Hz. The subsonic filter offers a range of roll-off
frequencies from 20 to 50 Hz to protect subwoofers from over-excursion,
with optional equalization to extend the response of B6 speaker
enclosures. A trim control provides 0 to 20 dB of attenuation for
matching levels among the various frequency bands. Filter frequencies are
programmable via provided SIP resistor networks.
SF-3 Spec Sheet (PDF)
