Peavey SP 118X User Manual download pdf (Page 2)

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.

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

Frequency (Hz)

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)

100

Impedance

(

)

Figure 2

1 2 3 4

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Peavey SP 118X User Manual Page 2

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