Alpine SPX-Z18T - Manuel (Page 23)

21
English
Type-3B: Despite the fact that the midrange
and tweeter are mounted in the same plane
and in close proximity, their orientation re-
sults in the acoustic center of the midrange
being farther away. Therefore, the midrange
is considered to be 8.5cm farther than the
tweeter, while the woofer is approximately
25cm closer than the midrange.
For the upper crossover point, a relatively
low Q 3
rd order high-pass filter is employed
on the tweeter in conjunction with a semi-1 st
order low pass on the mid. Then for the
midrange to woofer transition, a 3
rd order
high-pass on the mid integrates well with a
semi-2
nd order low-pass on the woofer. To-
gether, these filter combinations result in
acoustic crossover points of 3.8kHz and
600Hz.
Network Jumper Setting
Notes:
• Highlighted tweeter level jumpers are the recommended settings for each configura-
tion, but user adjustment may be desirable.
• Transfer function simulations only illustrate the effect of the filter upon the input sig-
nal, and therefore do not represent the actual frequency response of the system.
• If separate channels of amplification are used (bi-wire or tri-wire mode), the appro-
priate signal link jumpers must be removed.
10
0
–10
–20
–30
–40
–50
20Hz 30Hz 100Hz 1.0KHz 3.0KHz 10KHz 30KHz 300Hz
HP-2 HP-1 LP-2 LP-1 +2dB
MID HP/LP
–3dB –1.5dB 0dB/0
°
+1.5dB/15
°
+4dB/30
°
HP-1
HP-2
HP-3
BYPASS
BYP
ASS
LP-1 LP-2 LP-3
LP-BYP
ASS
HP-BYP
ASS
TW LEVEL
WF LP MID HP/LP
WF/MID
SIGNAL LINK
SPX–Z18T
TW HP
MID/TW
SIGNAL LINK
+
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+
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