Alpine SPX-Z18T - Manuel (Page 22)

20
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
+
—
+
—
System Type 3
Type-3A: Both midrange and tweeter are at
the same distance and angle, while the
woofer position is closer and fairly off-axis
to the listening position. Therefore, the
acoustic center of the woofer is considered
to be the closest driver by approximately
18.5cm. In order to minimize overlap while
maintaining phase coherence between the
mid and woofer, a 3
rd order high-pass and
semi-2 nd order low-pass are applied, result-
ing in a summation point of 600Hz. Since
the tweeter and midrange are farther away,
minimal delay and some level adjustment
are desirable, utilizing a low Q semi-2
nd or-
der high-pass on the tweeter and a 1 st order
low-pass on the mid for a resultant acoustic
crossover point of 3.8KHz.
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.