Next PXL118 User manual

USER MANUAL
PXL118
PX System Professional Subwoofer

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V052013
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Content
INTRODUCTION - 2 -
SAFETY FIRST - 2 -
UNPACKING - 3 -
PXL118 OVERVIEW - 3 -
CABLE SELECTING - 4 -
CONNECTION AND ELECTRIC DIAGRAM - 4 -
AMPLIFICATION - 5 -
TROUBLESHOOTING - 6 -
TECHNICAL SPECIFICATIONS - 7 -
WARRANTY - 8 -
SPARE PARTS - 8 -
CONTACTS - 9 -

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INTRODUCTION
Thank you for purchasing a NEXT PXL118 subwoofer. This manual will provide you
with important information about your NEXT PXL118 Sub 1 and NEXT PXL118 Sub 2. Please
devote some time reading this manual, and keep it close for future reference. NEXT-Proaudio
is concerned with your safety and well-being, so please follow all instructions and heed all
warnings. Also, a better understanding of some specific features of the PXL118 Subwoofer
will help you to operate your system to its full potential.
SAFETYFIRST
It’s important that loudspeaker systems are used in a safe manner. Please take some
time to review the following points concerning safe use of the NEXT PXL118 Subwoofer.
DANGER – HEARING DAMAGE
NEXT PXL118 subwoofers are capable of producing extremely high sound pressure
levels and should be used with care. Hearing loss is cumulative and can result from levels
above 90dB if people are exposed for a long period. Never stand close to loudspeakers
driven at high levels.
Stacking
Always ensure that the floor or structure where the stack will take place is even and
can withstand the weight of the complete stack. Do not stack speakers too high, especially
outdoors where winds could topple the stack. Be aware that speakers working at very high
power levels generate vibrations that can creep the systems. Take additional measures to
prevent this if needed. Place cables in a way that they do not present a trip hazard. Don’t
place any objects on top of the stack, they can fall accidentally and cause injuries. Do not
attempt to move the enclosures while connected. Try not to operate the PXL118 under heavy
rain or moisture, it is weather-resistant but not completely “weather-proof”. Also do not
expose the systems to extreme heat or cold conditions to prevent component damage.

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Rigging and suspension
WARNING: DO NOT SUSPEND PXL118 Sub1. In the NEXT PX system only the
PXL118 Sub 2, PXH64 and PXA8000 are designed to be suspended, PXL118 Sub 1 was not
designed having suspended use in mind.
Before rigging or suspending any NEXT PX system component, inspect all components
and all hardware for any signs of damage or missing parts. If you find any damaged,
corroded or deformed parts, do not use them, replace them immediately. Do not use
hardware that isn’t load rated or that its rating is not enough to handle the system’s weight
with a good safety factor. Don’t forget that the hardware won’t just hold the systems weight.
It has to be sturdy enough to handle dynamic forces like winds without any part
deformation.
NEXT PX system installation should only be carried out by qualified personnel. Always
use adequate protective clothing and equipment to prevent possible injuries. Isolate the
surrounding area during installation and operation, to prevent general public presence near
the systems. Also, be sure you understand all local and national regulations regarding
equipment installation. Failure to comply with these instructions may result on injury or
death.
UNPACKING
Each NEXT PX system component is built in Europe (Portugal) by NEXT-Proaudio, to
the highest standard and thoroughly inspected before it leaves the factory. When unpacking
the NEXT PXL118, examine it carefully for any signs of possible transit damage and inform
your dealer immediately if any such damage is found.
It is suggested that you retain the original packaging so that the system can be
repacked in the future if necessary. Please note that NEXT-Proaudio and its authorized
distributors cannot accept any responsibility for damage to any returned product through the
use of non-approved packaging.
PXL118OVERVIEW
The NEXT PXL118 subwoofer element is part of the PX system1. There are two
different enclosures named PXL118 Sub 1 and PXL118 Sub 2. This is because of their
configuration within the system. PXL118 Sub 1 is placed directly on the floor, and Sub 2 is
placed on top of Sub 1.
The PXL118 makes use of a hybrid design to achieve a high maximum sound pressure
while producing a deep low bass well below 50 Hz. Even under maximum load the impulse
response accuracy is striking. It has a rich and punchy sound and was specifically designed
to match the PXH64 mid/hi element extending its’ frequency response down to 50Hz. It’s
1Refer to PXH64 user manual for a full description of PX System.

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cabinet shape, size and rigging arrangements are totally compatible with the PXH64. To
achieve the highest possible sound pressure levels, the PXL118 was conceived with a hybrid
bass horn driven by a very powerful long excursion 18” driver with a 100mm voice coil, for
precise and powerful bass without any dynamic loss even under high SPL output.
CABLESELECTING
Selecting a cable consists of calculating the correct cable section (size) in relation to
the load impedance and the required cable length. A small cable section will increase its
serial resistance, which will induce power-loss and response variations (damping factor).
The following table indicates, for 3 common sizes, a cable length with a maximum
serial resistance equal to 4% of the load impedance (damping factor = 25):
Cable section Maximum Length related to load impedance
8 Ω4Ω
1.5 mm² 12 m [40 ft] 6 m [20 ft]
2.5 mm² 20 m [64 ft] 10 m [32 ft]
4 mm² 32 m [104 ft] 16 m [52 ft]
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CONNECTIONANDELECTRICDIAGRAM
The PXL118 is connected through Neutrik® Speakon® NL8FC plugs (not supplied). A
wiring description is printed on the connections panels located on back of the cabinet.

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V052013
The 8 pins of the 2 NL8 Speakon sockets are wired in parallel within the enclosure.
Either connector can be used to connect to the amplifier or another Sub.
See the table and the diagram below:
NL8 PIN Description
1+ Sub 1 POS
1- Sub 1 GND
2+ Sub 2 POS
2- Sub 2 GND
3+ PXH64 Reserved
3- PXH64 Reserved
4+ PXH64 Reserved
4- PXH64 Reserved
Electric Diagram
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AMPLIFICATION
The PXL118 sub-woofers are designed to be used with professional power amplifiers
capable of producing 1000W to 1400W into 8 ohms. When used in the PX system standard
configuration, all processing and powering needs are taken care of by the PXA80002element.
2Refer to PXA8000 manual for more information.

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Care should be taken to avoid amplifier clipping. It is important to understand
that a low power amplifier driven into clipping is more likely to damage a loudspeaker than a
higher power amplifier used within its ratings.This is because music signals have a high
peak-to-average "crest" factor. When an amplifier is severely overdriven, its output
waveform is “clipped” (its peaks are squared off) – reducing the crest factor. In extreme
cases, the waveform can approach that of a square wave. An amplifier is normally capable of
producing far more power under these conditions than its undistorted rated power output.
The use of very high power amplifiers with outputs much greater than those recommended is
discouraged.
Care should also be taken to avoid switch-on surges, which can result in momentary
power peaks in excess of specified ratings. The PXA8000 element has a protection circuit to
avoid this between the integrated processor and amplifier. Nevertheless, this circuit only
works within the PXA8000 components, if you switch off your mixer or any other exterior
component the power surge will occur. When powering up a sound system it is important to
switch on the amplifiers last, after the mixer and control electronics have stabilised. When
powering down the system, reverse the sequence and switch off the amplifiers first.
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TROUBLESHOOTING
Simple troubleshooting does not require sophisticated measurement equipment and
can be easily undertaken by users. The technique should be to segment the system in order
to identify the faulty system component: signal source, controller, amplifier, loudspeaker or
cables. Most installations are multi-channel. It is often the case that one channel works and
others do not. Trying different combinations of system elements can usually help to isolate
and locate the fault.
Some cabinet faults can be quite easily identified and corrected by the user. A simple
sweep with a sine wave generator can be very helpful though it MUST be made at a fairly
low level to prevent damage to the components. A sine wave sweep can help find:
Vibrations due to loose screws.
Air-leak noises: check that no screws are missing, particularly where the accessories
attach to the cabinet.
Vibrations due to a front grille badly positioned on the quick release fixings.
Foreign object that has fallen into the cabinet after repair or through the ports.
Internal connection wires or absorbing material touching the loudspeaker diaphragm:
check by removing the bass loudspeaker.
Loudspeaker not connected or phase reversed following a previous inspection, test or
repair.
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TECHNICALSPECIFICATIONS
PXL118 TECHNICAL SPECIFICATIONS
Design Hybrid Horn
Nominal Impedance 8Ω
Continuous Power Handling 1400W
Sensitivity (1W/1m Half-Space) 104dB
Maximum SPL (calculated) 135dB
Frequency Response (-10dB) 32Hz - 180Hz
Crossover Frequency (active) LP 150Hz (24dB/Oct. L/R)
Components 1 x 18” Subwoofer
Connectors 2 x Parallel Neutrik® NL8
Enclosure Material 15mm Birch Plywood
Finish Black Textured Water-based paint
Grille Metal grille with black acoustically-invisible foam
Castors 4 (Optional)
Rigging Tracks 4 (Optional - only Sub 2)
Dimensions 600 x 750 x 641
Weight 47 Kg
Dimensions

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WARRANTY
NEXT products are warranted, by NEXT-Proaudio, against manufacturing defects in
materials or craftsmanship over a period of 2 years from the date of original purchase.
During the warranty period Next-proaudio will, at its discretion, either repair or replace
products which prove to be defective provided that the product is returned in its original
packaging, shipping prepaid, to an authorized NEXT-Proaudio service agent or distributor.
NEXT-Proaudio cannot be held responsible for defects caused by unauthorized modifications,
improper use, negligence, exposure to inclement weather conditions, act of God or accident,
or any use of this product that is not in accordance with the instructions provided by NEXT-
Proaudio. NEXT-Proaudio is not liable for consequential damages.
This warranty is exclusive and no other warranty is expressed or implied. This warranty does
not affect your statutory rights.
SPAREPA RT S 
Reference Description
Sub 1 Sub 2
BB05077 BB05077 Next 18” Sub-Woofer Speaker BB05077
NC01811 NC01813 Next PXL118 Grille
NCS05811 NCS05813 Next PXL Connections Back Panel
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ACCESSORIES
Reference Description
Wheel Kit
Rigging accessories for Sub 2 are described on the system manual that accompanies
PXH64 element.

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CONTACTS
In case of any doubts or any information just:
Write us:
NEXT-PROAUDIO
Rua da Venda Nova, 295
4435-469 Rio-Tinto
Portugal
Contact us:
Tel. [phone]
Fax. [phone]
Send an e-mail:
[email protected]
Search our website:
www.next-proaudio.com