NXS NX10 Service manual

DUAL VOICE COIL SUBWOOFERS
Installation Instructions / Owner's Manual
NX10 NX12

1
WARNING!
Exposure to high sound pressure levels can cause hearing loss
or damage. Listening to your system at loud levels while driving,
will impair your ability to hear traffic sounds and emergency
vehicles. Use common sense when listening to your system.
When installing your subwoofer enclosure in the vehicle,
securely fasten it to the frame or floorpan. If the enclosure is
not secured properly, there is danger of it becoming a
projectile in a collision.
Due to continuing product improvement, specifications and design are subject to change without notice.
INTRODUCTION
Congratulations on your purchase of a NXS subwoofer. Your selection of a NXS
Mobile Audio product indicates a true appreciation of fine musical reproduction.
Whether adding to an existing system or including a NXS subwoofer in a new
system, you are certain to notice immediate performance benefits.
RECOMMENDATION
A speaker's performance is only as good as it's enclosure. Proper installation,
enclosure size and crossover frequency will maximize the overall performance of
the subwoofer. To properly design and build an enclosure, knowledge of
woodworking as well as the proper tools are required. We highly recommend that
you have your enclosure built by an authorized NXS retailer. However, if you decide
to install it yourself, we have included the parameters of each driver and
recommended enclosure sizes. For up to date product and technical information,
please visit our website at www.nxsmobileaudio.com.

2
CALCULATING ENCLOSURES
It is difficult to give exact box dimensions that are universal for all cars and trucks. It
is for this reason that you must be able to calculate the space in which you have
available in order to achieve the proper air volume required.
It is recommended to build your enclosure from 3/4" thick MDF (medium density
fiberboard). Make sure the enclosure is sealed airtight.
Calculating External Volume
1.) To calculate box volume, measure the outside Width x Height x Depth of the
enclosure. Example 12" x 14" x 9" = 1512".
2.) Next you must convert cubic inches into cubic feet. To do this, you must
divide the cubic inch total by 1728". Example 1512 ÷ 1728 = .875 Cubic feet
Calculating Internal Volume
1.) To calculate the internal (net) volume of the above box you must first multiply
the thickness of the wood you are using by Two (2). Example 3/4" x 2 = 1.5".
2.) Next subtract 1.5 from each of the outside measurements of the box.
Width Height Depth
12-1.5=10.5 14 -1.5 = 12.5 9 -1.5 = 7.5
3.) Multiply the new totals (H x W x D) Example: 10.5 x 12.5 x 7.5 = 984.375
4.) Next you must convert cubic inches into cubic feet. To do this, you must
divide the cubic inch total by 1728" Example 984.375 ÷ 1728 = .5696
cubic feet.
PRODUCT SPECIFICATIONS (Voice Coils in Series)
NX10 NX12
Free Air Resonance. (FS) 30 27
Total Q of driver @ FS including all resistances. (Qts) .51 .55
Q of driver @ FS including non electrical resistance. (Qms) 3.66 3.97
Q of driver @ FS including electrical resistance. (Qes) .59 .64
The driver's compliance expressed as an equivalent
volume of air (Liters). (Vas) 51 79.84
The driver's linear displacement (millimeters). (Xmax) 10 10
The DC resistance of the driver's voice coil (ohms). (Re) 6.5 6.7
Thermal power rating of driver (R.M.S./Peak). (Pe) 250/500 250/500
The driver's voice coil inductance (millihenries). (Le) 3.1 3.1
The drivers sensitivity (dB). (Sens) 87 89

3
RECOMMENDED ENCLOSURES (NX10)
Please Note: Our suggested box volumes are given as internal air requirements
Ported Enclosure
Box Volume *1.4 Cu Ft. (39.63 Liters)
Port Frequency (Fb) 35 Hz (35 Hz)
Port Diameter 3 Inches (76.2 mm)
Port Length 10.25 Inches (260.2 mm)
* Box is given as internal air volume including port and driver displacement.
FrequencyFrequency
NX10 Amplitude Response (dB/Hz)NX10 Amplitude Response (dB/Hz) Sealed EnclosureSealed Enclosure
5 Hz5 Hz 1010 5050 100100 500500 10001000
00
dBdB
66
1212
-6-6
-12-12
-18-18
-24-24
F3 = 49F3 = 49
Sealed Enclosure
Box Volume * .62 Cu Ft. (17.76 Liters)
* Box is given as internal air volume including driver
displacement.
NX10 Amplitude Response (dB/Hz)NX10 Amplitude Response (dB/Hz) Ported EnclosurePorted Enclosure
5050 100100 500500 100010005 Hz5 Hz 1010
00
dBdB
66
1212
-6-6
-12-12
-18-18
-24-24
F3 = 33F3 = 33

4
RECOMMENDED ENCLOSURES (NX12)
Please Note: Our suggested box volumes are given as internal air requirements
Ported Enclosure
Box Volume *2.0 Cu Ft. (55.93 Liters)
Port Frequency (Fb) 35 Hz (35 Hz)
Port Diameter 4 Inches (101.6 mm)
Port Length 12.8 Inches (325.15 mm)
* Box is given as internal air volume including port and driver displacement.
FrequencyFrequency
NX12 Amplitude Response (dB/Hz)NX12 Amplitude Response (dB/Hz) Sealed EnclosureSealed Enclosure
5 Hz5 Hz 1010 5050 100100 500500 10001000
00
dBdB
66
1212
-6-6
-12-12
-18-18
-24-24
F3 = 44F3 = 44
Sealed Enclosure
Box Volume * 1.0 Cu Ft. (28.35 Liters)
* Box is given as internal air volume including driver
displacement.
NX12 Amplitude Response (dB/Hz)NX12 Amplitude Response (dB/Hz) Ported EnclosurePorted Enclosure
5050 100100 500500 100010005 Hz5 Hz 1010
00
dBdB
66
1212
-6-6
-12-12
-18-18
-24-24
F3 = 33F3 = 33

5
NX10 & NX12 WIRING CONFIGURATIONS
Parallel Connections
Dual 4 Ohm Voice Coil Subwoofers
1 Ohm Load
To Amplifier
4 Ohm V.C. 4 Ohm V.C.
4 Ohm V.C. 4 Ohm V.C.
Parallel Connections
Dual 4 Ohm Voice Coil Subwoofer
2 Ohm Load
To Amplifier
4 Ohm V.C.
4 Ohm V.C.
Series Connections
Dual 4 Ohm Voice Coil Subwoofer
8 Ohm Load
To Amplifier
4 Ohm V.C.
4 Ohm V.C.
Combination Series/Parallel Connections
Dual 4 Ohm Voice Coil Subwoofers
4 Ohm Load
To Amplifier
4 Ohm V.C. 4 Ohm V.C.
4 Ohm V.C.4 Ohm V.C.

6
NX10 DIMENSIONS
NX12 DIMENSIONS
125,5125,5
276276
139139
123,5123,5
230.2230.2
113113

www.nxsmobileaudio.com
NX10/12 Subwoofer Manual
Rev. 7.16.07
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