QSC Audio DCA Series user manual LF-3 Factory-installed SIPs, LF-3 Factory Switch Settings

Page 9

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

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Contents Cinema Accessories Explanation of Graphical Symbols Important Safety Information Please ReviewTable of Contents Introduction & Description of Each Model IntroductionDescription of each model Configuring the Accessories Configuring the AccessoriesSetting up the XC-3 XC-3 Factory-installed SIPsXC-3 XC-3 Recommended Amplifier Settings XC-3 Factory Switch SettingsLF-3 Setting Up the LF-3LF-3 Factory-installed SIPs LF-3 Factory Switch SettingsLF-3 Recommended Amplifier Settings SF-3 Setting up the SF-3SF-3 Factory-installed SIPs SF-3 Factory Switch SettingsSF-3 Recommended Amplifier Settings MOUNTING- All Models Mounting the AccessoriesPage Cleaning Maintenance and WarrantyWorld Wide WEB Telephone Numbers HOW to Contact QSCPH 714 754-6175 FAX 714