Peavey SP 3G - Manual (Page 2)

NET WEIGHT:
95 lbs. (43.2 kg)
FEATURES
• 1505-8 KADT Black Widow
® woofer
• 6.5" Pro mid-range driver
• 22 XT compression driver
• Sound Guard high-frequency
protection circuit
• Trapezoidal enclosure design
DESCRIPTION
The SP 3G is a full-range 3-way
speaker system engineered for high
performance and versatility. Useful
for sound reinforcement, monitoring,
public address and musical play-
back. The system is comprised of a
15" Black Widow woofer with
Kevlar-impregnated cone, a 6.5"
professional mid-range driver, and a
22XT compression driver coupled
with a CH 3 constant directivity
horn.
This unit can be driven in a full-
range or bi-amp mode by simply
plugging into the desired jack on the
input plate. The SP 3G has a
trapezoidal shaped box, rather than
a rectangular shaped box, that
allows arrays to be constructed
much more easily. This shape also
greatly reduces the build-up of
standing waves on the inside of the
enclosure. This ensures a minimum
of mid-bass and mid-range colora-
tion of the reproduced sound due to
the cabinet. The SP 3G is con-
structed of 3/4" plywood and is
covered with Peavey's durable black
carpet. Polymer corners are also a
part of the unit to provide added
protection to the enclosure. A
powder-coated, expanded metal
grille covers the lower part of the
front of the enclosure to protect the
mid- and low-frequency drivers from
unforeseen accidents.
Sound Guard, Peavey's propri-
etary circuit for high-frequency
driver protection, has been included
as a integral part of the crossover
for the SP 3G. The input signal is
routed through the Sound Guard
circuit in both full-range and bi-amp
modes of operation. When the high-
frequency drive level to the SP 3G
exceeds a predetermined threshold,
the Sound Guard circuit is engaged.
This subtly decreases the signal
going to the 22XT so that it will not
be damaged due to long-term
overpowering. Short duration
transients will not be attenuated by
Sound Guard and have the possibil-
ity to damage the 22XT. The Sound
Guard circuit is a dynamic circuit
20 50 100 200 500 1k 2k 5k 10k 20k
Frequency (Hz)
30
40
60
80
100
140
180
300
360
Beamwidth
(Degrees)
Beamwidth
Vertical
Horizontal
Figure 3
20 50 100 200 500 1k 2k 5k 10k 20k
Frequency (Hz)
70
80
90
100
110
120
dB
SPL
(re
20
Pa)
Amplitude Response (1W 1m On-Axis)
Figure 1
20 50 100 200 500 1k 2k 5k 10k 20k
Frequency (Hz)
1
10
100
Q & Directivity Index
Q
Figure 4
20
10
Di
0
20 50 100 200 500 1k 2k 5k 10k 20k
Frequency (Hz)
1
2
3
5
10
20
30
50
100
Impedance
Z
( )
Figure 2