Onken with Emminence 15"

[tinitus]

Hi all,

I am in constant search fore the very special and cheap driver, and there never seems to be any luck

But now I have got a suspicion that this Emminence Gamma-15 might work very well in Onken and seem to go quite low

About 180 liter and sensitivity 95db up to 500hz - should work fine in a standard 3way, or maybe even with a fullrange

Cost 73 EUR

Any comments on that

[GM]

Greets!

Only that the vents are still too long at the lowest Sd'/Sd factor = 0.75.

GM

[tinitus]

OK, I should have known that 180 liter is too small with a 15" in Onken

It should be used in a standard BR, maybe with slot port and I reckon that will be very nice anyway


GM, thank you fore evaluation

[GM]

Greets!

You're welcome!

Hmm, not necessarily, I assume you'll either need an inductor, which has some series resistance or you can add some to 'fill' a larger cab. That, or build an EBS alignment, which normally blends better with the room. Adding 1 ohm and n = 7 drops the vent length enough and tuning to the mid 30s, otherwise if space is the issue and ~42 Hz is low enough, then a MLTL is probably best overall.

GM

[tinitus]

Hi,
GM, what do you mean by "EBS" alignment, and "n=7", if its not too complicated to explain

I guess with relative low Xmax=3mm, it should not be tuned too low

I would like to build the thing, not that I need it really

its not "for free", but from time to time I can see there is some demand for such a speaker, so at some time I might just do it, and hopefully find worldwide obtainable parts
Midrange could be AltecLansing inwall CF404-8A, and maybe a BohlenderGreabender tweeter

The 92-95db might come in handy when I build my small tubeamp

[GM]

Greets!

EBS = extended bass shelf. It's a larger than normal cab tuned low, typically as low as 0.7*Fs to get a ~sealed low Q alignment except with more gain above Fb for best transient response and take advantage of some room gain to make it perform ~flat in-room to a lower effective F3.

Onken alignments are defined by their 'n' factor, with 6.34 being the default and what the 180 L one is. Increasing it progressively increases Vb and decreases F3, Fb.

GM

[tinitus]

Forgot, sorry...I might have calculated with lowering Fs from 33hz to 30hz preferably with coating (complicated) or some epoxy around dustcap (could be measured)

I would really like a new dustcap glued at the point where membrane and voicecoilformer meets, and maybe some stiffening in this area
I really dont like when they glue the dustcap in the "middle" of membrane - is it to get the look of a bigger voicecoil, or have I missed something
But then its not a beginners job, and hard to controll the effect with xo - midrange might need coating too, and it easily gets out of hand

UPS.... suddenly not easy anymore will have to keep it simple and straight forward

[GM]

Greets!

Not AFAIK, the DC is used to shape/control its HF BW.

GM

[tinitus]

Ok, I have two options at the moment - build a speaker with modified drivers solely fore my own use, OR make it purely standard fore anyone to copy (which would make it more fun)

If get any further with this I will be back with details

Thanks

[tinitus]

Project stopped permanently - I am told that theese drivers will have very high distorsion




My NEW "love" is B&C 18PS100 if only it didnt have that peak.... and dual spider