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Jumper Group Function
Although recommendations are made for the most common system types in the follow-
ing pages, there are actually over 250 unique and useful jumper combinations available
for a wide variety of vehicles, installations and personal tastes. While this flexibility has
obvious advantages, too many choices can also be confusing. Therefore, it will be help-
ful to understand the function of each jumper group in order to tune the network more
effectively:
TW-HP:
Although essentially a selectable high-pass filter, this section provides the major part of
the phase correction and response compensation of the network. By altering the slope,
Q, cut-off frequency and phase shift of the high-pass filter, it is possible to create "phase
linkage" with the woofer. This proper summation in the frequency and time domains is
what produces the seamless blend necessary for optimum imaging, staging, focus and
tonal balance in a multi-element system.
These relationships are affected by the distance and angle of both drivers relative to the
listener, their proximity to each other, and certainly the vehicle's interior as well. While
it is beyond the scope of this manual to describe each potential network combination in
detail, the following filter types are possible for the high-pass section of the network:
R1
+
R2
R3
R4
R5
–
st
1
Order:
2
• No HP jumpers
• HP1 + HP2 + HP3 + HP4
• HP1 + HP4
• HP1 + HP2 + HP3 + HP4 + HP5
• HP1 + HP2 + HP4
• HP1 + HP3 + HP4
• HP1 + HP4 + HP5
• HP2 + HP3 + HP4
• HP2 + HP4
• HP3 + HP4
TW PHASE:
This jumper group provides a means by which the tweeter connection can easily be
reversed. By flipping the tweeter polarity "in" or "out" of phase (0° or 180°), it is possible
to achieve proper phase linkage for a wider variety of applications.
10
BYPASS
C1
6dB/45°
4dB/30°
HP-1
2dB/15°
0dB/0°
-2dB
L1
-4dB
nd
Order:
C2
HP-4
+
–
L2
L3
rd
3
Order:
• HP1 + HP2
• HP1 + HP3
• HP1 + HP2 + HP3
• HP1 + HP2 + HP3 + HP5
• HP1 + HP2 + HP5
R1 = 1.0Ω
R2 = 2.2Ω
R3 = 3.9Ω
R4 = 5.6Ω
R5 = 8.2Ω
C1 = 4.7µF
C2 = 12µF
L1 = 0.17mH
L2 = 0.24mH
L3 = 0.52mH
th
4
Order:
• HP2 + HP4 + HP5
• HP3 + HP4 + HP5
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