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Building a 15-inch Jensen / Onken Bass Reflex Loudspeaker

In order to achieve an optimal quality (Qtc=0.707), the so-called Thiele Aligement (n) is used - usually n=5.7

The total area of the tunnels is about 90% of the total area of the active diaphragm surface in the best case.

Moved air masses behind the driver and in the tunnels should be identical.

The resistance of the low-pass inductor is to be included absolutely also into the computation of the total quality factor (Qts)!

To the housing volume (Vb) the tunnel volume has to be added.

Necessary data :
Fs	[Hz]	Free air resonant frequency of the chassis
Qts	[ ]	Total quality factor of the chassis
Vas	[l]	Equivalence volume of the chassis in Ltr.
R	[cm]	Diaphragm radius
n	[ ]	Thiele - Alignement

Fs [Hz] :

Qts :

Vas [ltr] :

R [cm] :

Aligement (n) :

Vb	[liters]	Net volume of the box
Fc	[Hz]	-3dB Frequency
Fb	[Hz]	Resonant frequency box
Tm	[cm²]	Port area
L	[cm]	Port length
P_vb	[liters]	Port volume

V_b (liters) :

F_c (Hz, -3 dB) :

F_b (Hz) :

V_b (incl. P_vb) :

liters

T_m (cm²) :

L (cm) :

P_vb (liters) :