Im glad someone else said something.
Onken is just basically a reflex cabinet with 2 slot ports.
Faital pro driver seems to behave like many other pro sound 12" drivers.
actual alignments will put that driver in 90 to 113 liters. Basically 3 or 4 cubic feet.
BB4 = 3.1 cubic feet 43hz FB
C4 = 3.9 cubic feet 40hz FB
if you wanted to change the Q of the cutoff , just tune slightly higher
closer to the FS of the driver which is 54hz
Kinda reminds me of the Electro Voice TL606 enclosure.
Which had a single slot port. With " step down" mode
Basically a slot port tuned to 55hz and had a plate you
could install over the port to block some of the opening
which would lower tuning to 40hz
Point is, If you like the aesthetic of a Onken cabinet.
Then build what you want then.
It is perfectly feasible to build a 3 or 4 cubic foot cabinet
with 2 slot ports.
If you use C4 alignment 4 cubic feet is actually pretty close to
the dimensions you want. the driver and 2 slot ports will
remove further volume. So I dont think you need to " reduce"
volume very much or even at all.
Likewise perfectly feasible to have 40hz tuning as per alignment
by blocking some of the port. or having higher tuning at 55hz
if you wanted tuning options.
Onken is just basically a reflex cabinet with 2 slot ports.
Faital pro driver seems to behave like many other pro sound 12" drivers.
actual alignments will put that driver in 90 to 113 liters. Basically 3 or 4 cubic feet.
BB4 = 3.1 cubic feet 43hz FB
C4 = 3.9 cubic feet 40hz FB
if you wanted to change the Q of the cutoff , just tune slightly higher
closer to the FS of the driver which is 54hz
Kinda reminds me of the Electro Voice TL606 enclosure.
Which had a single slot port. With " step down" mode
Basically a slot port tuned to 55hz and had a plate you
could install over the port to block some of the opening
which would lower tuning to 40hz
Point is, If you like the aesthetic of a Onken cabinet.
Then build what you want then.
It is perfectly feasible to build a 3 or 4 cubic foot cabinet
with 2 slot ports.
If you use C4 alignment 4 cubic feet is actually pretty close to
the dimensions you want. the driver and 2 slot ports will
remove further volume. So I dont think you need to " reduce"
volume very much or even at all.
Likewise perfectly feasible to have 40hz tuning as per alignment
by blocking some of the port. or having higher tuning at 55hz
if you wanted tuning options.
Got ya. I guess when using the onken calculator, I got a little caught up on some of the parameters not being "proper". Again, with little to no experience in this specific field, it is a little difficult to anticipate what I can or cannot ignore. This is a good push for sure.
I think I've landed on some final thoughts on my plans. I've attached WinISD window, with final "Onken" inspired ports. I had to lengthen the ports, so I guess I did a transmission sort of thing? Not quite sure if I thought this through correctly...but I'd appreciate some feedback if this looks okay, or is completely going to falter (or somewhere in the middle!).
Attachments
Kinda-sorta, but not the acoustic scenario the Onken designer(s) postulated. Anyway, will need to sim in HR since the response will look/measure more like the Altec's in its mid-bass response since basic reflex math doesn't account for the vent's open cylinder/pipe's harmonics comb filtering with the driver's output, i.e. what makes the Onken alignment's performance worth the extra effort.
Last edited:
Couple of questions for an accurate HR sim:
1. Since it cannot do multiple ports at a time, can I just switch the port cm^2 and length to what it would be if it was only 1 port, via my WinISD calc?
2. with the volume of the box being substantially affected by the port, should I just input the volume of the box without the port sides (just the open section behind the driver) as my Vrc?
Actually, there's a number of new multiple tube alignment designs I've yet to learn, but pretty sure we can do two rows and maybe even four, so being short of time I'm going to see if one of the gurus for these types will try to do it as close as HR allows, though for sure do what you can to learn HR because for 99.9% of the DIYers it's the program to use.
Correct.
edit: Actually, IME much better to design it using the horn Wizard even if just a big vent reflex (BVR).
Correct.
edit: Actually, IME much better to design it using the horn Wizard even if just a big vent reflex (BVR).