Peavey SP 1G - Manual (Page 2)

Net Weight:
95 lbs. (43.2 kg)
FEATURES
• 1505-8 KADT Black Widow
® woofer
• 44XT ™ compression driver
• Trapezoidal enclosure design
• SA-1
™ stand mount
DESCRIPTION
The SP ™ 1G is a step up to a
higher performance loudspeaker
system within the SP line of enclo-
sures. It is a two-way loudspeaker
consisting of a 15" Black Widow
®
woofer and a 44XT ™ compression
driver loaded with a CH ® 7 constant
directivity horn.
This unit can be driven in full-
range or bi-amp mode simply by
plugging into the desired jack on the
input plate. The trapezoidal design
of the enclosure allows arrays to be
constructed much more easily than
when using a rectangular shaped
box. This shape also greatly
reduces the buildup of standing
waves on the inside of the enclo-
sure. This ensures a minimum of
mid-bass and midrange coloration
of the reproduced sound due to the
cabinet. The SP
™ 1G is constructed
of 3/4" plywood and 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 enclo-
sure to protect the low-frequency
driver from unforeseen accidents.
Sound Guard 44XT ™ , a version
of Peavey’s proprietary high-
frequency driver protection circuit
designed especially for the 44XT
™ ,
has been included as an integral
part of the crossover for the
SP
™ 1G. The input signal is routed
through the Sound Guard 44XT ™
circuit in both full-range and bi-amp
modes of operation. When the high-
frequency drive level to the SP
™ 1G
exceeds a predetermined threshold,
the Sound Guard 44XT
™ circuit is
engaged. This is achieved at
approximately 90% full-rated power
with most program material. The
effect that this has is to
decrease the signal level going
to the 44XT
™ by about 6 dB so that
it will not be damaged due to long
term (thermal) overpowering. Short
duration transients will not be
attenuated by Sound Guard 44XT
™
and have the possibility to damage
the 44XT
™ .
20 50 100 200 500 1k 2k 5k 10k 20k
Frequency (Hz)
30
40
60
80
100
140
180
300
360
Beamw
id
th(
Degrees
)
Beamwidth
Vertical
Horizontal
Figure 3
20 50 100 200 500 1k 2k 5k 10k 20k
Frequency (Hz)
60
70
80
90
100
110
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