Frequency Response; Power Handling - Peavey DTH 218b Manual De Instrucciones

FEATURES
• Dual BW X 1888 HP Black
Widow ® X woofers
• Anti-axial driver arrangement
• 16-gauge powder coated metal
grill with foam overlay
• Four-and eight-conductor input
with four-conductor output
• Black polyurethane coating
• Rear casters
DESCRIPTION
®
The DTH 218b is a perfect match
as an additional low-frequency
enclosure for any of the DTH
enclosures. This enclosure is
loaded with two BW X 1888 HP
®
Black Widow X Woofers.
One of these woofers has been
mounted backwards (its electrical
polarity has also been reversed
so that its acoustical polarity is
identical to the other woofer).
The anti-axial arrangement of the
drivers eliminates virtually all even-
order harmonic distortion. Maximum
versatility was our main goal when
considering the input to this loud-
speaker. Both drivers are con-
®
nected to a Neutrik four-conductor
Speakon ® connector. The drivers
are also connected to one half of a
®
Neutrik eight-conductor Speakon
connector. The other half of this
connector is hooked up to a second
Neutrik ® four-conductor connector.
This connector serves as an output
to another loudspeaker such as a
DTH ® 4210. By using this output,
you will have only one "home run"
of a cable going to your amps
instead of two four-conductor
cables. A black polyurethane
coating covers the DTH 218b.
This is a low-wear, high abrasion-
resistant material, similar to those
used in the automotive industry. A
heavy-duty, 16-gauge metal grille
with polyester foam overlay dresses
off the enclosure and provides
superior protection for the drivers.
All this combines to give you a
great-looking and great-sounding
subwoofer perfectly suited to any
low-frequency sound reinforcement
application.
®

FREQUENCY RESPONSE

This measurement is useful in
determining how accurately a given
enclosure reproduces an input
signal. The frequency response of
®
the DTH 218b is measured at 1
meter using a 2.0-volt swept sine
input. As shown in Figure 1, the
drivers in the DTH 218b combine
to give a smooth frequency
response from 45 Hz to 250 Hz.

POWER HANDLING

There are many different
approaches to power handling
ratings. Peavey rates this speaker
system's power handling using a
modified form of the AES Standard
®
2-1984. Utilizing audio band (20 Hz
to 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 situations. 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 3 dB of
amplifier headroom available.
ARCHITECTURAL and
ENGINEERING
SPECIFICATIONS
The loudspeaker system shall have an
operating bandwidth of 45 Hz to
250 Hz. The output level shall be
100 dB when measured at a
distance of one meter with an input
of one watt. The nominal imped-
ance shall be 4 ohms with speakers
paralleled, 8 ohms with speakers
independently powered. The
continuous power handling shall
be 1,000 watts, with maximum
program power of 2,000 watts and
minimum amplifier head-room of
3 dB with speakers paralleled. The
continuous power handling shall
be 500 watts x 2, with maximum
program power of 1,000 watts x 2,
and minimum amplifier headroom
of 3 dB with speakers indepen-
dently powered. The outside
dimensions shall be 22 3/4 inches
wide by 47 1/4 inches high by
29 3/4 inches deep. The
weight shall be 145 lbs. The
loudspeaker system shall be a
®
Peavey model DTH 218b.