Amate Audio S18WP User manual

User’s manual
April 2023

NITID S18WP Apr 2023
2 Amate Audio
Safety Instructions
1. All safety instructions must be read before using this device.
2. Keep and follow these instructions
3. Heed all warnings
4. The exclamation mark in the triangle indicates internal components which if
replaced can affect safety.
5. The lightning symbol within the triangle indicates the presence of dangerous
uninsulated voltages.
6. Only clean the device with a dry cloth.
7. Do not block any ventilation openings. Install in accordance with the
manufacturer’s instructions.
8. Do not install the device near heat sources such as radiators, heaters or other
heat-emitting elements.
9. Protect the power cord from being walked on or pinched, particularly at plugs,
convenience receptacles, and the point where they exit from the apparatus
10. The equipment must be repaired by qualified technical service personnel when:
A. The mains supply cable is damaged, or
B. Any object or liquid has damaged the device; or
C. The equipment does not function normally or correctly; or
D. The equipment has been exposed to the rain; or
E. The chassis is damaged
11. Disconnect the device in the case of electric storms or during long periods of
disuse.
12. WARNING – To reduce the risk of fire or electric shock, do not expose this
device to rain or moisture
13. The equipment shall not be exposed to dripping or splashing and no objects filled
with liquids, such as vases, shall be placed on the device.
14. For hanging and installation, use manufacturer recommended accessories only.

NITID S18WP Apr 2023
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1. INTRODUCTION
1.1. General
Amate Audio would like to thank you for your confidence in our NÍTID Series. We
suggest you to carefully read the following instructions in order to obtain the best
results in performance.
1.2. Features and presentation
S18WP
•Passive subwoofer
•NL4MP Speakon input & parallel output
•2400 W program power
•Sensitivity 1 W / 1 m: 98 dB
•18” woofer with 4” voice coil
•Nominal impedance 8Ω
2. CONNECTIONS
2.1. Connection description
A) SPEAKON: The S18WP uses two NL4MP Speakon terminals and is duly
prepared for a perfect connection in a parallel system. Terminal Pins +1/-1 must be
always used, disregarding the +2/-2 which are not internally connected. Respect
always the polarity +/-.
Fig. 1. S18WP connectors
It is strongly recommended to use a two-conductor high quality wire, non-
shielded and two-coloured. We recommend using a minimum section of 4
mm
2
for each conductor. Avoid long wire distances as they induce to
important power and quality losses.
A
A

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2.2. Recommended set-up for S18WP passive subwoofers
One unit of HD4000 (in bridge mode) can feed up to two units of S18WP.
Fig. 2. S18WP configuration
2.3. Recommended presets for S18WP
The S18WP can be used with an external LMS206 /LMS608 (digital signal
processor).
ATTENTION: When the S18WP is used in conjunction with the Full-range NÍTID S
systems in XOVER HPF90 preset, the S18WP must operate in positive polarity.
When the S18WP is used in conjunction with the Full-range NÍTID S systems in
FLAT, SPEECH, MONITOR presets, the S18WP must operate in negative polarity.
Model
LMS206/608
Model
S18WP
Impedance
8Ω
Model
HD4000
Mode
Bridge Bridge
Impedance
4Ω8Ω
Program power
4200W 2400W
Model
S18WP
Impedance
8Ω

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LPF80
80 Hz low pass filter
LPF90
90 Hz low pass filter
LPF100
100 Hz low pass filter
CARD80/90/100
Cardioid polar pattern, with processing, delay and inverse
polarity
Fig. 3. Recommended PRESETS for S18WP
3. MOUNTING AND PLACEMENT
For a proper installation of the acoustic cabinet systems, it is strongly recommended
to carefully read the following advices.

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3.1. S18WP with full-range systems
The S18WP incorporates a M20 base-plate on its upper
side for the attachment of a standard 35mm diameter
bar.
Fig. 4. S18WP socket
3.2. S18WP flying
Flying a NÍTID system is easy, fast and secure. To perform any operations related to
flying the systems, read the present document, and act on the warnings and advice
given.
Only experienced installers with adequate knowledge of the system and local safety
regulations should fly speaker cabinets.
It is the user's responsibility to ensure that the systems to be flown and the flying
accessories (such as chains, eyebolts, lock pins...) comply with state and local
regulations. They should be regularly inspected and replaced if in doubt.
When flying enclosures from ceiling support
structures, extreme care should be taken to
assure the load bearing capabilities of the
structures. Do not fly systems from unsafe
structures.
All flying accessories that are not supplied by
Amate Audio are the user's responsibility. Use
at your own risk.
Use the KRW118 accessory and the BRWX
bumper to fly the system. Refer to “KRW118
instructions manual” for more information.
Fig. 5. S18WP with KRW118 flying

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7 Amate Audio
4. CARDIOID SUBWOOFERS The S18WP enables the combination of three or
multiple of three subwoofer cabinets in an array to
provide exceptional directivity at low frequencies.
To get the correct set-up parameters, please
contact [email protected]. High directivity
at low frequencies has two main effects on the
sound field: firstly, the low frequency level behind
the subwoofer cabinets is greatly reduced;
secondly, in closed venues the diffuse sound field
at low frequencies is reduced so the low frequency
reproduction is much more precise.
Fig. 6. Traditional polar pattern of a subwoofer at 40Hz
The typical operating range of a traditional subwoofer tends to be like a monopole,
i.e. tends to radiate with the same energy in all directions. This behaviour implies
that the control of radiation at low frequencies is very difficult because the
wavelengths are very large compared to the size of the source (8.5 m at 40Hz).
To increase the directivity at low frequencies we must transform the omnidirectional
performance into a cardioid performance. This can only be achieved by various
sources, arranged in a certain position, to which we apply a
specific phase, filtering and delay. That is, we need to
reproduce two signals with the same frequency and similar
amplitude, which will have a difference in phase of
approximately 180º at a certain point of the sound field. If the
phases and delays are well calculated, the result is a system,
in which we cancel the energy of the back and not the one of
the front.
Fig. 7. Cardioid pattern
4.1. The CARDIOID presets
The S18WP can generate an
uncompromised cardioid behaviour when
used in conjunction with an external Amate
Audio processor and their correct set-up
parameters. In its minimum and standard
configuration a cardioid setup consists of a
stack of three subwoofer cabinets or an
horizontal line of three subwoofer cabinets.
Only one subwoofer is needed to
compensate for the energy of the other two
radiating to the front. Then, the cabinet
facing to the back (to the stage) should be
located in the centre of the column or line.
Fig. 8. Cardioid configuration for S18WP
(stack)

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Fig. 9. Cardioid configuration for S18WP (horizontal line)
The cardioid preset must only be applied to the rear facing
subwoofers (BACK STAGE). The front facing subwoofers (FRONT
AUDIENCE) must use the corresponding front-facing preset, as
shown in the table below:
S18
WP Preset
(BACK
STAGE)
S18
WP Preset
(FRONT
AUDIENCE)
Box model
CARD80
STANDARD LPF80 STANDARD Generic, HPF 80 Hz
CARD90
STANDARD LPF90 STANDARD Generic, HPF 90 Hz
CARD100
STANDARD LPF100 STANDARD Generic, HPF 100 Hz
Fig. 10. Correspondence of rear and front presets for cardioid applications
When placing the subwoofers in a cardioid configuration keep a distance to walls of at
least 60 cm in order not to affect the radiation of the central reversed cabinet.
Fig. 11. Back energy rejection at 40 Hz / 50 Hz / 63 Hz

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5. TECHNICAL FEATURES
S18
WP
Impedance
Nominal 8 Ω
Power
R.m.s 1200 W
Program 2400 W
Connectors 2 x Speakon NL4MP input & link
Audio Performance
Frequency response
(-10 dB usable bandwidth)
with external DSP
33 Hz – 140 Hz [LPF100]
SPL (1W / 1m) 98 dB
Nominal directivity (-6dB) Omnidirectional
Components
LF 1 x 18” woofer (4” voice coil)
Cabinet
Type Bass-reflex
Height 555 mm
Width 740 mm
Depth 748 mm
Weight (net) 58 Kg
Material Multilayer birch plywood
Finish Hi-resistance black matt Polyurea coating.
2 mm steel front grilles with black acoustic mesh.
Note: Specifications subjected to change without prior notice.

The NÍTID loudspeaker systems have been designed,
engineered and manufactured in Barcelona – SPAIN
by
Amate Audio S.L.
Perpinyà, 25 · Polígon Industrial Nord · 08226 Terrassa
T. [phone] – F. [phone] –
[email protected]
R&D and FACTORY:
Violinista Vellsolà, 18 · 08222 Terrassa
T. [phone] – F. [phone]
Barcelona – SPAIN
www.amateaudio.com
© Copyright 2023 by Amate Audio S.L.