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Description
The SP 218BX is a subwoofer
designed enhance the low-end
tin SP Series or other full-range
speaker systems. Other uses include
bass guitar, keyboard and drum
monitoring.
The enclosure is constructed of
a hardwood panel coated with
Peavey’s heavy-duty HammerHead
™
UV stabilized polyurea finish for
increased durability and ruggedness.
A powder-coated, perforated
steel grille covers the front of the
enclosure. Recessed steel handles
on either side provide portability.
A pole guide for support of a
pole-mounted, high-pass enclosure
is provided on one side of the SP
218BX. Rubber feet are provided on
the opposite side for horizontal use.
Rubber feet and corner casters on
the bottom and a corner handle on
top make moving the enclosure an
easy, one-person operation.
Inputs are at the rear of the enclosure
and consist of two 1/4" jacks, one
four-pin twist lock connector and
one Neutrik Speakon switching jack.
The enclosure input is configurable,
with the default being 4 ohms with
both drivers in parallel when using
the parallel inputs. A dual-woofer 2
x 8 ohm configuration is available
through the switching Neutrik jack,
which disconnects the 4 ohm inputs
and provides separate inputs to the
woofers when used. This ingenious
input design provides maximum
flexibility for single- or dual-amplifier
operation, without having to
manually rewire the enclosure.
This low frequency enclosure is
comprised of two 18" Pro Rider
®
subwoofer drivers in a vented
alignment. The Pro Rider driver
delivers superior performance due
to its advanced cooling system,
large 4" voice coil with edge-
wound aluminum wire and Kevlar
®
composite cone. This design provides
strong bass extension and high
power handling to complement a full-
range sound system.
As the SP 218BX does not include a
passive subwoofer crossover, input
should be electronically filtered for
subwoofer applications. In addition,
for high power operation, a high-pass
filter set at 35 to 40 Hz and 12 to 24
dB Butterworth should be used to
improve performance and reliability.
Frequency response
This measurement is useful in
determining how accurately a given
unit reproduces an input signal. The
frequency response of the SP 218BX
is measured at a distance of 1 meter
using a 1 watt (into the nominal
impedance) swept-sine input signal
in an anechoic environment. As
shown in figure 1, the SP 218BX
produces a smooth frequency
response from 51 Hz to 300 Hz.
Power handling
There are many different approaches
to power handling ratings. Peavey
rates this loudspeaker system’s
power handling using a modified
form of the AES Standard 2-1984.
Using 40 Hz to 400 Hz 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 available amplifier headroom.
Harmonic distortion
Second and third harmonic
distortions vs. frequency are plotted
in figures 3 and 4 for two power
levels, ten percent (10%) of rated
input power and either one percent
(1%) of rated input power or 1 Watt,
whichever is greater. Distortion is
read from the graph as the difference
between the fundamental signal
(frequency response) and the desired
harmonic. For example, a distortion
curve that is down 40 dB from the
fundamental is equivalent to 1%
distortion.
Architectural & engineering
specifications
The loudspeaker system shall have
an operating bandwidth of 51 Hz to
300 Hz. The nominal output level
shall be 99 dB when measured at a
distance of one meter with an input
of one watt. The nominal impedance
shall be 4.0 ohms or 2 x 8 ohms,
depending on configuration.
The maximum continuous power
handling shall be 1,200 watts,
maximum program power of 2,400
watts, a peak power input of at least
4,800 watts and a minimum amplifier
headroom of 3 dB. The outside
dimensions shall be 49.21 inches
high by 21.04 inches wide by 30.28
inches deep. The weight shall be 147
lbs. The loudspeaker system shall be
a Peavey model SP 218BX.
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.
SPECIFICATIONS SP
™
218BX