2-46
Cat. No. 517 Jumper Settings
Each of the two Cat. No.517 has five programming jumpers and three switches:
• S1 through S3 select a fixed treble boost (9 dB at 5 kHz, 14 dB at 10 kHz) designed to
approximate the large treble equalization required with many screen speakers. Up is
on, down is off. Note that this boost (called treble compensation to distinguish it from
other kinds of eq.) is available only for screen channels. Neither P (Left surround) nor
Q (Right surround) channels have this boost feature, and this circuit is disabled in the
left slot of the CP200 for the S channel.
• J1 through J4 select high or low output gain ranges for the four channels on the card.
The HIGH/LOW selectors on the CP200 Backplane must be left in the HIGH position
at all times for best performance and the gain range jumpers on the cards used
instead.
The CP200 output section actually has three signal paths for surround channel signals-S,
P (Left surround), and Q (Right surround). In a normal monaural surround installation,
only the S output is used. In installations configured to play 70 mm stereo surround films
(format 43), the P (Left surround) and Q (Right surround) outputs are normally used and
the S output ignored.
In some theaters the S output is used to feed rear wall speakers or balcony speakers so as
to have three separate zones with separate level controls. In a stereo surround system, it
is best to re-allocate these speakers to the P (Left surround) and Q (Right surround)
channels as appropriate. (However, where this is not practical, in the DA20 a mono
surround output created by summing the left and right surround signals is provided and
is routed to the S output channel in the CP200.)
S2
S1
S3
ON
J2
J1
J3
J4
ON
ON
OFF
OFF
OFF
L/Le
L
C/S
C
R/Re
R
P/Q
S
TREBLE
COMP.
OUTPUT
RANGE
CAT. NO. 517
HI
LO
HI
LO
HI
LO
HI
LO
Figure 2.12 Cat. No.517 Jumper Settings
