Page 3 - SF-1 SUBWOOFER FILTER; INTRODUCTION
1 SF-1 SUBWOOFER FILTER INTRODUCTION The SF-1 Subwoofer Filter is an upper slot accessory for QSC MXa Series amplifiers, which feature LevelOne Open Input Architecture. The accessory mounts in the back of the amplifier above the standard inputpanel. Ideal for adding subwoofer amplification to an exi...
Page 4 - CONFIGURATION; Positions 1 through 4 and 9 and 10
2 CONFIGURATION SETTING THE SUBSONIC FILTER FREQUENCY The subsonic (highpass) filter on Channel 1 cannot be bypassed, and Channel 2 should only be bypassedin 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 val...
Page 5 - Positions 5 through 8
3 • Stereo, Bridged Mono, and Parallel Mono If the two subwoofer channels are to carry different or independent program material, as in stereoor bridged mono, set the SF-1 for “Stereo” operation. Use this also for parallel mono operation froma single program signal source. For stereo, bridged mono, ...
Page 6 - INSTALLATION; accessory panel above it.
4 INSTALLATION Before installing the SF-1, disconnect the amplifier’s power cable from the AC mains. 1. Position the amplifier so that the rear panel is facing you. Locate the input panel and the blank accessory panel above it. 2. Remove the four mounting screws—the two holding the blank panel and t...
Page 7 - SPECIFICATIONS; TABLE 3; BLOCK DIAGRAM
5 SPECIFICATIONS SIGNAL TO NOISE RATIO (22 Hz to 22 kHz): 103 dB TOTAL HARMONIC DISTORTION <0.1 % CROSSTALK 70 dB below rated power within passband CMRR: better than 50 dB FILTER TYPE second-order butterworth, Q=0.707(LPF and unboosted subsonic filter) second-order, +6 dB boost, Q=2(boosted subso...
Page 9 - APPENDIX B: TECHNICAL ASSISTANCE & SERVICE; TECHNICAL ASSISTANCE; Product Return Guidelines; with your return correspondence.
7 APPENDIX A: WARRANTY & DISCLAIMERS DISCLAIMER QSC Audio Products, Inc. is not liable for any damage to speakers, amplifiers, or any other equipment thatis caused by negligence or improper installation and/or use of the SF-1 Subwoofer Filter. PRODUCT WARRANTY QSC Audio Products, Inc. guarantees...
Page 10 - QSC TECHNICAL SERVICES DEPARTMENT; INTERNATIONAL SERVICING; Factory telephone numbers:
8 QSC TECHNICAL SERVICES DEPARTMENT 1675 MacArthur Blvd Costa Mesa, CA 92626 Telephone: (800) 772-2834(714) 957-7150(714) 754-6175 Fax: (714) 754-6173 Bulletin Board: (714) 668-7567(800) 856-6003 INTERNATIONAL SERVICING For QSC products that are purchased outside of the United States, service must b...