Quantum Audio QC154 User Manual

2

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.

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

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.

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.

Free Air Resonance.

(FS)

25

Total Q of driver @ FS including all resistances.

(Qts)

.44

Q of driver @ FS including non electrical resistance only.

(Qms)

7.11

Q of driver @ FS including electrical resistance only.

(Qes)

.47

The driver's compliance expressed as an equivalent volume
of air (Cubic Ft.).

(Vas)

5.46

The driver's linear displacement (inches).

(Xmax)

.79

The DC resistance of the driver's voice coil (ohms).

(Re)

3.6

Thermal power rating of driver (R.M.S./Peak).

(Pe)1000/2000

The driver's voice coil inductance (millihenries).

(Le)

3.6

The drivers sensitivity (dB).

(Sens)

88