Axiom SW218XP User Manual

KEY FEATURES

• Very High Output
• Compact size for a very good output-to-weight ratio
• 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
System type
Transducer
Frequency response (±3 dB)
Frequency response (±10 dB)
Sensitivity (1.41V @ 1m, 2Pi)
Ma�imum Peak SPL @ 1m
Electrical
Nominal Impedance
Minimum Impedance
Power Handling Continuous*
Power Handling Program
Power Handling Peak
Power Compression
* AES Pink Noise Power
revision 2017-03-29
USER MANUAL
SW218XP
passive subwoofer
Manifolded Transmission Line
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
30 Hz – 92 Hz (Processed)
27 Hz – 300 Hz (Unprocessed)
101 dB (averaged from 40 to 100 Hz)
143 dB
8 Ω + 8 Ω
5.7 Ω + 5.7 Ω @ 36 Hz
1800 W + 1800 W
3600 W + 3600 W
7000 W + 7000 W
@ -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
• Manifolded Transmission Line configuration for very fast transient response
• 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
Connectors
Connector Type
Input Wiring
Mechanical
Width
Height
Depth
Depth with Wheels / Dolly
Construction
Paint
Transport
Net Weight
Wheels or Transport Dolly
Neutrik® Speakon® NL4 � 2
LF1 = Pin 1+/1-; LF2 = Pin 2+/2-
1215 mm (47.87")
590 mm (23.24")
950 mm (37.43")
1078 mm (42.44") / 1110 mm (43.70")
15 mm, reinforced Phenolic Birch
High resistance, water based paint
10 handles
114 Kg (251.3 lbs.)
4 heavy-load 100 mm ø (otional)