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Input Connections:
2x 1/4" input jacks, 2x 1/4" biamp jacks
Enclosure Materials and Finish:
3/4" OSB, Finished in Black Carpet
Dimensions (H x W x D):
Front:
53.50 in. x 21.50 in. x 27.50 in.
1359 mm x 546 mm x 699 mm
Rear
:
53.50 in. x 13.13 in. x 27.50 in.
1359 mm x 333 mm x 699 mm
Net Weight:
149 Lbs. (67.7 kg)
Features
• Two 1505-8KADT Black Widow woofers
• 44XT
™
compression driver
• Sound Guard
™
44XT
™
high frequency
protection circuit
• Trapezoidal enclosure design
• Built-in pocket casters for easy transport
DESCRIPTION
The Peavey SP
™
7G is a newly
designed quasi-three-way speaker system
comprised of two 15" Black Widow
woofer/midrange, and a 44XT compres-
sion driver coupled to a CH 7 constant
directivity horn.
As with all SP full-range speakers,
this unit can be driven in full-range or
biamp mode simply by plugging into the
desired jack on the input plate. The SP 7G
has a trapezoidal shaped cabinet, rather
than the more traditional rectangular
shape. This allows cabinet arrays to be
constructed more easily. This shape also
greatly reduces the build-up of internal
standing waves. Standing waves are inter-
nal amplitude peaks that occur due to
reflections within the cabinet at frequen-
cies related to the internal square dimen-
sions of the cabinet. The trapezoidal
shape resists the formation of standing
waves by causing the internal reflections
to cancel rather than reinforce each other.
This ensures a minimum of mid-bass and
mid-range coloration of the reproduced
sound due to standing waves within the
cabinet.
The SP 7G is constructed of very high
quality 3/4" Oriented Strand Board (OSB),
which is a void-free, medium density, and
wood-species specific material. (This
material should not be confused with less-
er quality materials which possess internal
properties of OSB, and are commonly
known as “chip-board” or “wafer-board”.
These chip- or wafer-board materials use
inferior wood species, or a mixture of
species which compromise strength, have
poor screw-retention, and have low-resist-
ance to warpage.) The SP 7G OSB cabi-
net is finished with Peavey’s durable black
carpet. Polymer corners are also added to
provide further protection to the cabinet.
A powder-coated expanded metal grill
covers the lower section of the front of the
cabinet to protect the low-frequency driv-
ers from unforeseen impacts.
Sound Guard 44XT, Peavey’s propri-
etary circuit for high frequency driver pro-
tection, has ben included as an integral
part of the cross-over for the SP 7G. The
input signal is routed through the Sound
Guard 44XT circuit in both full-range and
biamp modes of operation. When the high
frequency drive level to the SP 7G
exceeds a predetermined threshold, the
Sound Guard 44XT circuit is engaged.
This subtly decreases the signal level
going to the 44XT so that it will not be
damaged due to long term over-powering.
Short duration transients will not be atten-
uated by Sound Guard 44XT and have the
potential to damage the 44XT driver. The
Sound Guard 44XT circuit is dynamic
in operation, and will only attenuate the
signal more in relation to the amplitude of
the signal, very similar to a compressor.
This is accomplished through the use of a
dynamically resistive component in con-
junction with the non-linear resistance
characteristics of a specific tungsten light
bulb. Should the bulb in your Sound
Guard 44XT ever burn out, a replacement
may be obtained from an Authorized
Peavey Service Center. However, if a
Peavey replacement bulb is not readily
available, then an automotive type 1156
bulb may be temporarily substituted.
FREQUENCY RESPONSE
This measurement is useful in
determining how accurately a given unit
reproduces an input signal. The frequency
response of the SP 7G is measured at a
distance of 1-meter using a 1 watt (into
the nominal impedance) swept-sine input
signal. As shown in figure 1, the selected
drivers in the SP 7G combine to give a
smooth frequency response from 50 Hz to
18 kHz.
DIRECTIVITY
Beamwidth is derived from the -6 dB
points from the polar plots (see figure 3)
which are measured in a whole space
anechoic environment. Q and Directivity
Index are plotted for the on-axis measure-
ment position. These are specifications
that provide a reference to the coverage
characteristics of the unit. These parame-
ters provide insight for proper placement
and installation in the chosen environ-
ment. The blending of the components of
the SP 7G exhibit a desirable beamwidth
and directivity (figure 3 and 4) suitable for
sound reinforcement applications.
POWER HANDLING
There are many different approaches
to power handling ratings. Peavey
Electronics rates this unit’s system power
handling using a modified form of the AES
Standard 2-1984. Utilizing audio band lim-
ited (20 Hz - 20 kHz) pink noise with
peaks over four times the RMS level. This
strenuous test signal assures the user that
every portion of this system can withstand
today’s high technology music. The test
signal contains large amounts of very low
frequency energy, effectively simulating
the frequency content of live music situa-
tions. The full measure of high frequencies
in the test signal allow for exposure of the
speaker system to synthesized tones that
may extend beyond audibility. This rating
is contingent on having a minimum of
3 dB of amplifier headroom available so
as to ensure that clipping does not occur.
ARCHITECTURAL & ENGINEERING
SPECIFICATIONS
The loudspeaker system shall have
an operating bandwidth of 50 Hz to 18
kHz. The nominal output level shall be
99.0 dB when measured at a distance of
one meter with an input of one watt. The
nominal impedance shall be 4.0 ohms.
The maximum continuous power handling
shall be 600 watts, maximum program
power of 1,200 watts and a peak power
input of at least 2,400 watts, with a mini-
mum amplifier headroom of 3 dB. The
nominal radiation geometry shall be 75
degrees in the horizontal plane and 65
degrees in the vertical plane. The outside
dimensions shall be 53.50 inches high by
21.50 inches wide by 27.50 inches deep.
The weight shall be 149 pounds. The
loudspeaker system shall be a Peavey
model SP 7G.
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