QSC Audio DCA Series LF-3 Factory-installedSIPs, LF-3Factory Switch Settings, Setting Up the LF-3

LF-3	Setting Up the LF-3
LF-3 Factory-installed SIPs
fxo	350 Hz, both channels (18 kΩ SIP resistor installed in J6 and J8)
Delay	1.4 milliseconds, both channels (22 kΩ SIP resistor installed in J1 and J2)

LF-3 Factory Switch Settings

When shipped from the factory, the DIP switch settings should be set as follows:

Switch 1 and Switch 10 ON:

Switch 2 and Switches 4 through 9 OFF: Switch 3 ON:

Delay active (both channels)

Required default setting for proper operation of the LF-3 Required default setting for proper operation of the LF-3

LF-3 Recommended Amplifier Settings

Clip limiters: ON, (both channels)

Low-frequency filters: ON (both channels), select either 30 or 50 Hertz roll-off depending on speaker specifications (both channels)

Operating mode: Typically Stereo mode, but Parallel mode can be used in applications requiring dual LF amp channels with one source

Use these tables to determine the correct resistor values for the crossover frequencies and delays you need.

Crossover freq. (fXO)	SIP resistor value
80 Hz	68K
150 Hz	39K
200 Hz	27K
250 Hz	22K
300 Hz	20K
350 Hz	18K
400 Hz	15K
500 Hz	12K

Delay (ms)	Identifying SIP resistor networks
	SIP resistor value
1.8	27K
1.4	22K
1.3	20K
1.2	18K
1	15K
0.8	12K
0.7	10K
0.6	8.2K
0.5	6.8K
0.4	5.6K
0.3	4.7K

9