Specifications

3-9
Low Frequency Time Delay Enable Jumpers [DELAY]
J100 Left Channel
J200 Center Channel
J300 Right Channel
These jumpers allow the low frequency portion of the designated channels
to be delayed when the jumper is placed in the “DELAY” position. This
compensates for the time offset caused by high frequency drivers being
behind the low frequency drivers in contemporary stage speakers. With the
jumper in the "DELAY" position, sound produced by the low frequency
speakers is delayed to cause the low and high frequency energy to reach
the listener at the same time. There is no low frequency delay when the
jumper is set to “NO DELAY”. The factory setting is “DELAY”.
Low Frequency Time Delay Setting Headers
RN101 Left Channel
RN201 Center Channel
RN301 Right Channel
For large horns, the correct delay setting is usually 1.9 ms. For small
horns, 0.8 ms is usually correct. The headers are shipped with each card.
NOTE
: Custom settings are possible. See
Appendix B, Cat. No. 683
.
RN400 L and R Surround Low-Pass Filter Frequency Select [50Hz]
This header sets filter circuits to the indicated low-pass frequency. Signals
below this frequency are sent to the surround channel low frequency
drivers. Both the Cat. No. 682 Output card and the Cat. No. 683 have
reversible filter headers for the surround channels. Ensure that the headers
on both cards are set to the same frequency, chosen to suit the low
frequency handling capability of the surround speakers in use. If you have
surround bass drivers, it is probably best to set both headers to
100 Hz in order to improve the low frequency power handling ability of
the surround channel. The factory setting is 50Hz.
J600 Bypass Channel HF Output Level Range [LO]
This jumper selects between two gain ranges for the bypass channel high
frequency output. The “HI” setting has approximately 12 dB higher
output level than the “LO” setting. The factory setting is “LO”.