6
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
