Hi

I just came across these drivers from Lii Audio and the astonishingly good offer that accompanies it:

www.lii-audio.com/index.php/product/new-top-hifi-audio-speaker-driver-10-full-range-crystal-cone-high-end-crystal-10-in-pair/

This one screams Onken box at me, I plugged the figures into this:


www.mh-audio.nl/Calculators/Onken.html

TS parameters

Fs 31.500 Hz driver frequency resonance

Re 5.760 ohms dc resistance of driver

Qms 7.750 mechanical Q of the driver

Qes 0.480 electrical Q of the driver

Qts 0.452 total Q of driver at Fs calculated by the software

Mms/d 14.830 gr total cone assembly mass

Sd 3.564E-02 m^2 effective radiation area of the driver cone

Rg 1.000 ohms total components resistance (xover coil, terminal, wire, amplifier, etc.)

Cms 1.72E-03 driver suspension compliance calculated by the software

Vas 306.239 litres air volume driver compliance calculated by the software

Vas*Qts2 84.459 calculated by the software

n = 6.340 (best 5.7) Onken alignment (best alignment = 5.7, Onken alignment = 6.34)

                    note: you can play with the n factor to maintain the L' vent under 30 cm but don't  try to use an excessive value because you don' t respect the Onken approach


Box and system response

F-3 23.822 Hz box cutoff frequency at -3dB

Fb 23.393 Hz box cutoff frequency

Cab 38.248 acoustical box compliance

Map 12.102 acoustical mass box

S vent 304.000 cm^2 this value is calculated by the vent dimension section

nO 0.019 Vas*Qts2’

dB 1w/1m 93.448 dB total efficiency of the system including Rg



Vent length

L vent 28.454 cm effective length vent

L’ vent 18.716 cm corrected effective vent length (use this length in your vent calculation)

note : If the L' vent is over 35 cm, your driver is not suitable for the Onken speaker application


Vent dimension (habitually an Onken speaker have a S vent equal or -15 % smaller to the driver Sd)

Width 4.000 cm indicate the width of one vent

Height 9.500 cm indicate the height of one vent

Quantity 8.000 indicate the number of vent you can use (Onken speaker have 6 or 8 identical vent)

S vent 304.000 cm^2 total vent area (try to obtain a S vent equal or maximum 15% less to the Sd)

Vent volume 5.690 litres total volume occupied by all vent in the box


Total Box Volume

Vb 535.468 litres total internal volume of the box

Vb Total 541.158 litres total internal volume of the box plus the required volume for the vent

Amazing, shame I don't have the money to buy a pair.

Looks like a good deal to snap up if you like that sort of driver, and the 10 inchers look interesting. That’s an enormous size for a full range for the extra driver at 15 inches!
Why is the Onken alignment 6.34 when the best is 5.7? Is that to tune in a bit of heft in the bottom end?
Have you had experience with the Onken design?

AMR-iFi R&D

Oops, I forgot to add in I used the best alignment (5.7) and that too was inside the requirements