Peavey SP 118X User Manual

SP™118X

4 Ohms

SPECIFICATIONS

Frequency response, 1 meter
on-axis, swept-sine in anechoic
environment:

50 Hz - 128 Hz (±3 dB)

Usable low frequency limit
(-10 dB point):

31 Hz

Power handling:

Full Range:

500 W continuous
1,000 W program
2,000 W peak

Sound pressure level, 1 Watt,
1 meter in anechoic environment:

Full Range:

98.0 dB SPL, (2.00 V input)

Sub Bass Section:

98.0 dB SPL, (2.00 V input)

Maximum sound pressure level
(1 meter):

Full Range:

125.0 dB SPL continuous

131.0 dB SPL peak

Sub Bass Section:

125.0 dB SPL continuous

131.0 dB SPL peak

Transducer complement:

Low Frequency Section:

1x 18 in., vented
1808 8 SPS BWX

Box tuning frequency:

Low Frequency Section:

39 Hz

Harmonic distortion:

1% rated power
2nd Harmonic:

100 Hz: 1.12%
1 kHz: 0.06%

3rd Harmonic:

100 Hz: 0.33%
1 kHz: 0.25%

10% rated power
2nd Harmonic:

100 Hz: 3.14%
1 kHz: 0.07%

3rd Harmonic:

100 Hz: 0.12%
1 kHz: 0.35%

Crossover frequency (internal
passive):

Sub Bass - Low Frequency:

125 Hz

High Out - Mid / High Frequency:

125 Hz

Impedance (Z):

Full Range:

Nominal: 4.0 Ω
Minimum: 3.9 Ω

Sub Bass (direct input):

Nominal: 4.0 Ω
Minimum: 4.4 Ω

Input connections:

One 1/4 in. phone jack passive input,
One 1/4 in. phone jack passive hi out,
One Neutrik

®

NL4 direct input

Enclosure materials and finish:

3/4" OSB and MDF, finished in carpet

Dimensions (H x W x D):

Front:

32.50 in. x 20.75 in. x 29.97 in.
826 mm x 527 mm x 761 mm

Rear:

32.50 in. x 20.57 in. x 29.97 in.
826 mm x 522 mm x 761 mm

Net weight:

125 lbs. (56.9 kg)

Features:

This loudspeaker system delivers high
output, low distortion bass from a single
1808-8 SPS BWX woofer mounted in a
vented enclosure. A versatile passive
crossover is included, which provides a
filtered high-pass output and direct input.
It is designed for portability and includes
handles, metal grille, reinforcing corners,
durable carpet finish and rubber feet. A
pole mount is included for mounting of a
high-pass enclosure.

SPECS

PEAVEY ELECTRONICS

Description

The SP 118X 4 Ohm is an add-on
subwoofer designed to make it easy to
add more low end to the SP X Series or
other full-range speaker systems. Other
uses include bass guitar and drum
monitoring.

The enclosure is constructed of 3/4" high
density OSB and MDF, and covered with a
heavy-duty black carpet and reinforced
with polymer corners. A black metal grille
covers the front of the enclosure.
Recessed handles on either side provide
portability.

This low frequency system consists of an
18" BWX Black Widow

®

woofer with

Kevlar

®

impregnated cone, mounted in a
vented enclosure along with a passive
crossover. This design provides strong
bass extension and high power handling
to complement a full-range sound system.

The SP 118X 4 Ohm includes a passive
subwoofer crossover, set at 125 Hz. This
crossover supplies both a low-pass output
to the 18" woofer in the enclosure, and a
high-pass output to a 1/4" panel jack. For
biamp / direct input use, a Neutrik

®

jack is

also provided.

Frequency Response

This measurement is useful in determining
how accurately a given unit reproduces an
input signal. The frequency response of

the SP 118X 4 Ohm is measured at a
distance of 1-meter using a 1 Watt (into
the nominal impedance) swept-sine input
signal. The solid line represents anechoic
filtered response; the dotted line is
anechoic direct input; and the dashed line
shows typical room response through the
filtered input. As shown in figure 1, the
selected driver in the SP 118X 4 Ohm
combines to give a smooth frequency
response from 50 Hz - 128 Hz.

The impedance response in Figure 2
shows the impedance curve for filtered
response as a solid line, and direct input
as a dotted line.

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
Standard 2-1984. Using audio band 20 Hz
to 20 kHz pink noise with peaks of 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. This rating is contingent
upon having a minimum of 3 dB of
amplifier headroom available.

Harmonic Distortion

Second and third harmonic distortions vs.
frequency are plotted in figures 5 & 6 for
two power levels, ten percent (10%) of
rated input power and either one percent

(1%) of rated input power or one watt,
whichever is greater. Distortion is read
from the graph as the difference between
the fundamental signal (frequency
response) and the desired harmonic. As
an example, a distortion curve that is
down 40 dB from the fundamental is
equivalent to 1% distortion.

Architectural and Engineering
Specifications

The loudspeaker system shall have an
operating bandwidth of 50 Hz - 128 Hz.
The nominal output level shall be 98.0 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 500 Watts, maximum program
power of 1,000 Watts and a peak power
input of at least 2,000 Watts, with a
minimum amplifier headroom of 3 dB.
The outside dimensions shall be 32.50
inches high by 20.75 inches wide by 29.97
inches deep. The weight shall be 125
pounds. The loudspeaker system shall be
a Peavey model SP 118X 4 Ohm.

3 + 2 YEAR LIMITED WARRANTY

NOTE: For details, refer to the

warranty statement. Copies of
this statement may be obtained
by contacting Peavey Electronics
Corporation, P.O. Box 2898, Meridian,
Mississippi 39301-2898.

Amplitude Response (1W 1m On-Axis)

120

110

100

90

dB SPL (re 20 Pa)

80

70

20 50 100 200 500 1k 2k 5k 10k 20k

Figure 1

Frequency (Hz)

Impedance

100

50
30

20

Z

(

)

10

5
3

2

1

20 50 100 200 500 1k 2k 5k 10k 20k

Figure 2

Frequency (Hz)