USER MANUAL
SW218XP
passive subwoofer
KEY FEATURES
• Very High Output
• Manifolded Transmission Line configuration for very fast transient response
• Compact size for a very good output-to-weight ratio
• Tetracoil dual voice coil for e�tended linear response and increased power handling
• Tetracoil dual voice coil for e�tended linear response and increased power handling
• High-strength, water repellent, glass fiber reinforced cones
INTRODUCTION
The SW218XP subwoofer is designed to deliver high quality low frequency reproduction where very high output is a key requirement, together
with well defined deep bass response and fast transient response. Its compact size and light weight
make it suitable for several different uses, ranging from touring applications to fi�ed installations and
high-level dance clubs.
The SW218XP is a very high quality powered subwoofer system featuring some of the most advanced
technologies for low frequency reproduction. Its unique and innovative design is based on a configuration
that can be defined as Manifolded Transmission Line.
It uses manifolding of the front side of the cones to ma�imize the mutual coupling between the
two drivers, while loading the back of the cone with a large-size transmission line that has the
function to create a transmission path from the back of the transducers to the front. This innovative
configuration does not use any large resonant cavity to load the speaker in order to get the lower
octave and this reduces significantly pressure decay time inside the enclosure, with large advantages
in terms of definition both at the lowest end and the upper bass. At the same time, it doesn’t use very
long transmission line paths as well. Its working principle is an hybrid combination between a short
transmission line and an overdamped refle� load. Moreover, the ma�imization of the mutual coupling between the drivers increase the fastness
of the transient response while ma�imizing the overall energy efficiency as well.
The SW218P subwoofer system is equipped with two high power 18” (460mm) transducers capable of long e�cursion (up to 30mm peak-to-
peak), and featuring a a large displacement suspension system. These transducers use Tetracoil technology, where two different, a�ially separated
magnetic gaps and two inside-outside 100mm (4” ) diameter voice coils are wound on the same former and suspended evenly in the two magnetic
gaps. This creates an equivalent voice coil diameter greater than 6”, resulting in a larger heat dissipation area for and increased power handling.
Additional key advantages of the Tetracoil technology are also minimized distortion and a very symmetric and flat inductance curve.
Cones are made of very high-stiffness fiberglass reinforced paper, featuring also invisible water repellent treatment.
TECHNICAL SPECIFICATION
Acoustical
Connectors
System type
Manifolded Transmission Line
Connector Type
Neutrik® Speakon® NL4 � 2
Transducer
Two 18” (460 mm), 4” (100 mm) VC,
Water repellent cone and epo�y coated
plates, 100mm (4in) Tetracoil dual voice coil,
equivalent to a single coil diameter
larger than 152mm (>6in) suspension, ultra
linear suspension behavior
Input Wiring
LF1 = Pin 1+/1-; LF2 = Pin 2+/2-
Mechanical
Width
1215 mm (47.87”)
Height
590 mm (23.24”)
Depth
950 mm (37.43”)
Frequency response (±3 dB)
30 Hz – 92 Hz (Processed)
Depth with Wheels / Dolly
1078 mm (42.44”) / 1110 mm (43.70”)
Frequency response (±10 dB)
27 Hz – 300 Hz (Unprocessed)
Construction
15 mm, reinforced Phenolic Birch
Sensitivity (1.41V @ 1m, 2Pi)
101 dB (averaged from 40 to 100 Hz)
Paint
High resistance, water based paint
Ma�imum Peak SPL @ 1m
143 dB
Transport
10 handles
Electrical
Net Weight
114 Kg (251.3 lbs.)
Nominal Impedance
8 Ω + 8 Ω
Wheels or Transport Dolly
4 heavy-load 100 mm ø (otional)
Minimum Impedance
5.7 Ω + 5.7 Ω @ 36 Hz
Power Handling Continuous*
1800 W + 1800 W
Power Handling Program
3600 W + 3600 W
Power Handling Peak
7000 W + 7000 W
Power Compression
@ -10 dB Power (180 W + 180 W) = 0.6 dB
@ -3 dB Power (900 W + 900 W) = 2.0 dB
@ 0 dB Power (1800 W + 1800 W) = 3.4 dB
* AES Pink Noise Power
revision 2017-03-29
