Quantum Audio Car Speaker QP124D User Guide

QP124D - 12” Subwoofer  
Installation Instructions / Owner's Manual  
QUANTUM AUDIO  
Tel: 956-428-4263 Fax: 956-421-4513  
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PRODUCT SPECIFICATIONS  
Free Air Resonance.  
(FS)  
33  
.54  
Total Q of driver @ FS including all resistances.  
(Qts)  
(Qms)  
(Qes)  
Q of driver @ FS including non electrical resistance only.  
Q of driver @ FS including electrical resistance only.  
7.98  
.49  
The driver's compliance expressed as an equivalent volume  
of air (Cubic Ft.).  
(Vas)  
(Xmax)  
(Re)  
2.9  
.31  
6.4  
The driver's linear displacement (inches).  
The DC resistance of the driver's voice coil (Ohms).  
Thermal power rating of driver (R.M.S./Peak).  
The driver's voice coil inductance (millihenries).  
The driver’s sensitivity (dB).  
(Pe) 400 / 800  
(Le)  
4.03  
89  
(Sens)  
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. Example12"x14"x9"=1512".  
2.) Nextyoumustconvertcubicinchesintocubicfeet. Todothis, youmust  
dividethecubicinchtotalby1728". Example1512÷1728=.875Cubicfeet  
CalculatingInternalVolume  
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.) Nextsubtract1.5fromeachoftheoutsidemeasurementsofthebox.  
Width  
12-1.5=10.5  
Height  
14-1.5= 12.5  
Depth  
9-1.5= 7.5  
3.) Multiplythenewtotals(HxWxD)Example:10.5x12.5x7.5=984.375  
4.) Nextyoumustconvertcubicinchesintocubicfeet. Todothis, youmust  
dividethecubicinchtotalby1728"Example984.375÷1728=.5696  
cubicfeet.  
QP124D  
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RECOMMENDED ENCLOSURES  
PleaseNote:Oursuggestedboxvolumesaregivenasinternalairrequirements  
Sealed Enclosure  
Box Volume  
*1.0 Cu Ft.  
* Box is given as internal air volume including driver  
displacement.  
QP124D AAmplitudee Responssee (dB/Hz)  
Sealed Ennclosure  
12  
6
F3 = 57  
0
dB  
-6  
-12  
-18  
-24  
5 Hz  
10  
50  
100  
500  
1000  
Frequuency  
Ported Enclosure  
Box Volume  
*2.0 Cu Ft.  
40 Hz  
4 Inches  
8 Inches  
Port Frequency (Fb)  
Port Diameter  
Port Length  
QP124D AAmplitudee Responssee (dB/Hz)  
Ported Ennclosure  
12  
6
0
F3 = 38  
dB  
-6  
-12  
-18  
-24  
5 Hz  
10  
50  
100  
500  
1000  
Frequuency  
QP124D REV 7.28.05  
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