I searched through a lot of thread here and did not find anyone building an Onken cabinet with two drivers.
Has anyone done sims or built one?
I am thinking of 2 12's, does this effectively double the size of the cabinet?
Has anyone done sims or built one?
I am thinking of 2 12's, does this effectively double the size of the cabinet?
Yes.
An Onken is just a reflex box with vents down the side. Originally tuned to have a low bass shelf alignemnst, more recent ones often maxFlat. My miniOnkens use their own alignment.
You can use tnese numbers dfor the sim.
Fs is the same. Qst the same, Vas doubles.
dave
An Onken is just a reflex box with vents down the side. Originally tuned to have a low bass shelf alignemnst, more recent ones often maxFlat. My miniOnkens use their own alignment.
You can use tnese numbers dfor the sim.
Fs is the same. Qst the same, Vas doubles.
dave
Thanks Dave.
To shed light on my quest, I currently have cabinets built very closely to the Haraga 360l with Altec 15". 3/4 Baltic birch instead of 1" with volume compensated for thinner ply.
I also have the Jensen Ultraflex info from which the Onken was derived.
I'm into older light paper cone woofers like early Jensen, Magnavox etc and do not have the specs to put into a box calculator.
That said, doubling the volume would make a pretty large box, so I need to ponder, as it may put the horns on top too high above the listener.
To shed light on my quest, I currently have cabinets built very closely to the Haraga 360l with Altec 15". 3/4 Baltic birch instead of 1" with volume compensated for thinner ply.
I also have the Jensen Ultraflex info from which the Onken was derived.
I'm into older light paper cone woofers like early Jensen, Magnavox etc and do not have the specs to put into a box calculator.
That said, doubling the volume would make a pretty large box, so I need to ponder, as it may put the horns on top too high above the listener.
The only 2x15” Onken I know of is the Onken W, which isn’t an Ultraflex at all.
However it is a very, very good bass box
However it is a very, very good bass box
Even a poor T/S measuring device will get you closer to where you need to be with a box.
A tiny bit of cash/effort to get an idea of where your drivers are coud save you hundreds of dollars of quality plywood/time/effort.
There is no universal box. Some are more flexible than others but a reflex is usually the least tolerant. But an Onken is easy to push a bit or heavily towards aperiodic which often helps.
Even just changing amplifiers can make a difference. For instance if you use an amplifier with a high outout impedance (Rout) amplifer the enclosure should be larger than if you use a low Rout amplifier.
You start with the woofers. Then you go from there. What woofers do you have?
dave
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I have the 12" Jensen P12 RJ , Magnavox with the big magnet that looks like the Jensen PLL, Rola field coil and Jensen field coil, and Altec 414.
Those Jensen 12" drivers appear pretty similar to Philips AD4200M 12" Alnico "full-range" drivers I recently picked up.
Anybody know what Philips AD4200M QTs is? Cannot find that spec anywhere (rumored to be near ~0.5?) and no sensitivity, only "Efficiency 7%"
The Philips is supposed to work well on open baffle but came in a box that was sealed, with back panel removed by me to use.
Anybody know what Philips AD4200M QTs is? Cannot find that spec anywhere (rumored to be near ~0.5?) and no sensitivity, only "Efficiency 7%"
The Philips is supposed to work well on open baffle but came in a box that was sealed, with back panel removed by me to use.
Altec 414 is dark green
Jensen is blue
Magnavox is light green
Rola is red
Smoothing is 1/6 octave
Nothing super scientific here I threw the box together from srap from another project. It's open backed and the port is covered.
Just a quick comparison.
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I'm not dumb enough put them all in one box.
I would use pairs of the same driver like most semi normal folk would do.. 🙂
I would use pairs of the same driver like most semi normal folk would do.. 🙂
@mr ed lol - there's really nothing normal about us speaker nuts. Normal people don't obsess about or do all the crazy stuff we do.
@drjlo 7% efficiency is about 100 dB/W. I don't remember the actual Qts of the AD4200s but I vaguely recall it said to be in the upper 0.5 range. They have really nice warm bass but still decent low end control for the way they're designed. I really like alot of the older Philips drivers.
I would not be surprised if those Philips driver have the same qualities as the Magnavox and the early Jensen. The era of light cones and high efficiency used with low power tube amps of that period.
The Philips drivers of this period are very well designed. These specific drivers provided a good balance of warm, yet clean bass. Large wide range drivers are very satisfying to listen to. They have this sense of realism in the lower mids which only larger cone drivers can deliver
The Philips is indeed very satisfying and seems to have this power to decrease my need to keep analyzing SQ.
I may be addicted to these vintage 12" Alnico drivers, and a pair of Altec 12" 419-8B popped up locally which I'm considering picking up. I know they are not nearly as popular as Altec 414, but i suspect the lower frequencies to midrange should be fairly similar(?). I do have various tweeters/CD's I could throw up top if needed 😀
I may be addicted to these vintage 12" Alnico drivers, and a pair of Altec 12" 419-8B popped up locally which I'm considering picking up. I know they are not nearly as popular as Altec 414, but i suspect the lower frequencies to midrange should be fairly similar(?). I do have various tweeters/CD's I could throw up top if needed 😀
Jeez, as soon as I left this website, somebody posted a pair of Coral Holey Basket drivers for sale, which I just bought.
Coral Holey on open baffle on top of Philips or Altec 12" on open baffle, something like that seems reasonable.
Then again, maybe I can find some Telefunken OB cabinets locally..
Man, this is a disease 😱
Coral Holey on open baffle on top of Philips or Altec 12" on open baffle, something like that seems reasonable.
Then again, maybe I can find some Telefunken OB cabinets locally..
Man, this is a disease 😱