User`s manual

2-6

2.4.3 Cat. No. 513

SU U

FREQ

SUB

J502

FREQ

TREBLE

100Hz

J501

50Hz

TREBLE

1kHz

1kHz 1.8kHz

1.8kHz

Subwoofer Jumpers

Jumpers for controlling the subwoofer channel are located on

the Cat. No. 513 equalization board. To gain access to these

jumpers, open the front panel and remove the plate covering

the equalization controls.

J501 Subwoofer Upper Frequency Limit Setting

This jumper sets upper frequency limit of the subwoofer

channel in optical or non-sync formats to either 50 Hz or

100 Hz. The recommended setting of this jumper depends on

the type of screen speakers in your cinema.

If you have the older horn-loaded type of speaker (such as

Altec A-4), the jumper should be set to 100 Hz and the

equalization for the left, center, and right screen speakers

should be rolled off below this frequency. These settings will

remove frequencies from the main screen speakers that they

cannot accurately reproduce at full power and send them to

the subwoofer which is better able to handle them. The factory

setting is 100 Hz.

If you have the newer direct-radiator type of screen speakers,

set J501 to the 50 Hz position and adjust the equalization of the

main screen speakers to roll off below that frequency.

J502 Subwoofer Mute Jumper

This jumper disables the subwoofer channel when it is placed

in the MUTE position. The subwoofer channel should be

muted during adjustment of the room equalization.