QSC Audio SUBWOOFER FILTER, SF-1 owner manual Boost on

APPLICATION NOTES

For cinema surround channels and subwoofers that do not require an EQ boost, use the following switch settings.

SW1 slide switch- BOOST OFF

SW2 DIP switch
Position 1	ON
Position 2	OFF
Position 3	OFF
Position 4	ON
Position 5	ON
Position 6	OFF
Position 7	ON
Position 8	OFF
Position 9	ON if bridged mono, OFF otherwise
Position 10	OFF if bridged mono, ON otherwise

The high pass filter frequency for non-boosted subwoofers, such as the JBL 4645 and Electro-Voice systems NOT being used in the step-down box tuning mode, should be selected at about 0.8 times the box tuning frequency of the subwoofer. A frequency of 20, 25, or 32 Hz will usually give the best results. Select an appropriate SIP resistor pack and install it in position RN3. Consult your speaker manufacturer for more details about your specific subwoofer system. Surround channels may benefit from the use of a high pass filter at 80 Hz, also installed in position RN3.

For cinema subwoofers that require an EQ boost, use the following switch settings.

SW1 slide switch-	BOOST ON
SW2 DIP switch
Position 1	ON
Position 2	OFF
Position 3	OFF
Position 4	ON
Position 5	ON
Position 6	OFF
Position 7	ON
Position 8	OFF
Position 9	ON if bridged mono, OFF otherwise
Position 10	OFF if bridged mono, ON otherwise

The high pass filter frequency for boosted, B6 subwoofer alignments should be selected according to the recommendations of the speaker manufacturer. Select an appropriate SIP resistor pack, for the desired boost frequency, and install it in position RN3. Listed below are some suggested filter frequencies for popular subwoofers, consult your speaker manufacturer for more details about your specific subwoofer system. A variance of +/- 5% from the exact boost frequency will have very little effect on the performance of the system.

Electro-Voice:
TL880D	25 Hz
TL550D	32 Hz
TL3512	32 Hz
TL440	32 Hz
JBL:
4645B	25 Hz

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