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High frequency:
Nominal: 8.0 Ω
Minimum: 6.0 Ω
Input connections:
1x 1/4 in. phone jack (input), 1x 1/4 in.
phone jack (thru only) and 1x Neutrik
®
NL4 Speakon
®
(biamp only)
Enclosure materials and finish:
3/4" OSB finished in black carpet
Mounting provisions:
This unit is not designed for overhead
suspension
Dimensions (H x W x D):
Front:
49.00 in. x 21.00 in. x 22.75 in.
1245 mm x 533 mm x 578 mm
Rear:
49.00 in. x 14.00 in. x 22.75 in.
1245 mm x 356 mm x 578 mm
Net Weight:
125 lbs. (56.8 kg)
Features:
• Quasi three-way, full range/
biampable PA enclosure
• Sound Guard
™
HF driver protection
circuit
• RX22
™
driver with a 2" titanium
diaphragm coupled to a CH
®
941 90°
X 40° constant-directivity horn
• Dual 15" BWX Black Widows
®
with
Kevlar
®
cones and field replaceable
baskets
• SP
™
X series trapezoidal cabinet
and styling
• External voicing switch
• Neutrik biamp jack
Description
The SP 4X is both a cosmetic and
performance redesign of the SP 4G
loudspeaker system. This high power
handling, two-way loudspeaker system is
comprised of a 15" BWX woofer with a
Kevlar impregnated cone and an RX22
compression driver coupled to a CH 941
constant directivity horn. This unit can be
driven in full-range mode simply by
plugging into the 1/4" phone jack on the
input plate. A thru-only 1/4" phone jack
connector is also provided to allow a
second loudspeaker to be connected
without making a cable run back to the
amplifier. A Neutrik Speakon connector is
provided as an input for biamp operation.
The trapezoidal design of the enclosure
allows arrays to be constructed much
more easily than it would be using a
rectangular shaped box. 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 coloration of the reproduced
sound due to the cabinet. The SP 4X is
constructed of 3/4" OSB 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
enclosure to protect the low frequency
driver from unforeseen accidents.
A voicing switch on the input cup
allows for the selection of two different
response settings for the loudspeaker
system. The normal position will yield a
more flat response. The EQ position will
have decreased output in the mid-range
and upper mid-range areas. This position
may be preferred for some types of
program material. The response curve for
each position is given in figure 1.
Sound Guard III is the redesign of
Peavey’s proprietary circuit for high
frequency driver protection for the new
RX22 compression driver. This is an
integral part of the crossover for the SP
4X. The input signal is routed through the
Sound Guard III circuit in both full-range
and biamp modes of operation. When the
high frequency drive level to the SP 4X
exceeds a predetermined threshold the
Sound Guard III circuit in engaged. The
effect that this has is to subtly decrease
the signal level going to the RX22 so that
it will not be damaged due to long-term
overpowering. Short duration transients
will not be attenuated by Sound Guard III
and have the possibility to damage the
RX22. The Sound Guard III circuit is a
dynamic circuit that will attenuate the
signal more the larger the signal is, very
similar to a compressor. This is
accomplished through the use of a
specially selected dynamically resistive
light bulb. If the bulb in your Sound Guard
III should ever burn out, a replacement
may be obtained from an Authorized
Peavey Service Center. However, if a
Peavey replacement bulb is not readily
available, a Sylvannia SK3 bulb may be
located at various loudspeaker or
electronics parts stores.
Frequency Response
This measurement is useful in
determining how accurately a given unit
reproduces an input signal. The frequency
response of the SP 4X 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 4X combine to give a
smooth frequency response from 51 Hz —
16 kHz.
Power handling
There are many different approaches
to power handling ratings. Peavey rates
this loudspeaker system’s power handling
using a full-range form of the AES
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)
EQ
Normal
Switch Position
Figure 1
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