# Onken Bass Relex 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.

## Onken Loudspeaker Calculator

Based on research of M.Eijiro Koizumi, J.Mahul & J.Hira

## Driver Parameters

all fields are required!
Fs [Hz] Free air resonant frequency of the driver
Re [ohms] dc resistance of the driver
Qms mechanical Q of the driver
Qes electrical Q of the driver
Mms [g] total cone assambly mass of the driver
Sd [cm2] effective radiation area of the driver

Rg [ohms] total components resistance (xover-coiol, terminal, wires, etc.)
Port width [cm] indicate the width of one port
Port height [cm] indicate the height of one port
Quantity number of ports used (Onken speakers have 6 or 8 identical ports)
n Alignment (best alignment = 5.7, Onken alignmet = 6.34)    *

* Note: you can change the aligement factor ( n ) to maintain the corrected Portlenght under 61 cm

If the corrected Portlength is above 61 cm, your speaker is not suitable for the Onken speaker application!

## Onken Loudspeaker Calculations

 Qts = total Q of driver at fs Cms = m/N driver suspension compliance Vas = air volume driver compliance (liters)

 F-3 = box cutoff frequency at -3dB (Hz) Fb = box cutoff frequency (Hz) Cab = acoustical box compliance Map = acoustical mass box no = driver reference efficiency (%) Qtc = total Q of the speaker in an enclosure including all system resistances

## Port Calculations

 Sport = (cm2)   total port area (Sport should be equalor max. 15% less then Sd) Port volume = total volume occipied by all ports in the box (liters) Port length = effective port length (cm) Port length corrected = corrected effective port length (cm) Note: If the corrected effective port length is over 45 cm, your driver is not suitable for the Onken Loudspeaker!

## Onken Loudspeaker Properties

Vb = total internal volume of box (liters)
Vb total = total internal volume of box plus the required volume for the vent (liters)
F-3 = box cutoff frequency at -3dB (Hz)
SPL = total efficiency of the system including Rg (dB 1W/1mtr)

## Frequency Response

<<< Back

script type="text/javascript" src="//fc.webmasterpro.de/counter.php?name=mh-audio">