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-   -   Onken mini for Fe108EZ (http://www.diyaudio.com/forums/full-range/67134-onken-mini-fe108ez.html)

hth2412 2nd November 2005 09:32 AM

Onken mini for Fe108EZ
 
Hi,
I am going to make a bookshelf and I chosen FE 108EZ.
Is this Ok if I loaded in mini Onken cabinet ? as I supposed to have more bass.

Do you guy have any better idea or suggestions for the bookshelf enclosure ?

Your advise is highly appreciated.
Best regards
hth

Josephjcole 2nd November 2005 12:19 PM

I'm not sure the 108e sigma is well suited for a ported enclosure due to its small size and lack of any real excursion capabilities. Maybe a larger fostex driver, or a 4" driver with a bit more x-max.
just my 2cents
Joe

usa_satriani 2nd November 2005 03:33 PM

The X08 are made for Horn speakers and do not suit Bass Reflex enclosures.

The X07 can be used in a bass reflex enclosure.

You know a Fostex Backhorn would make nice little speakers with a FE108EZ

Bob Brines 2nd November 2005 09:34 PM

Re: Onken mini for Fe108EZ
 
Quote:

Originally posted by hth2412
Hi,
Is this Ok if I loaded in mini Onken cabinet ? as I supposed to have more bass.

The major feature of the Onken cabinet is that the port area equals the driver Sd. There are also some alignment issues, but you can Google "Onken" and do the reading. The problem with most modern drivers is that the Vas is too small to make the concept work. I have been looking specifically at the FE127E, and the required port length is 12-15" to tume to 70 Hz. This posses some difficulties with a 9.5 liter cabinet!

Bob

GM 2nd November 2005 11:20 PM

Greets!

Indeed! In Thuras's BR patent, which is where the original 'Onken/Ultraflex' is depicted, he states that Sd = Av was used strictly to simplify his electrical equivalent ckt. equations, but somewhere along the line it became 'gospel' as the ideal.

To keep the (13) vents short and tune it to the 12" nominal test driver's 40 Hz Fs, it had a ~15.84 ft^3 Vas, with only a 10 g Mms and a usable 50-10 kHz BW! My kind of wide BW driver. :) Unfortunately, few have survived.

Anyway, folks normally either and/or just keep increasing Vb until the vent length is managable and damp them as required or use an Av = Sd * 0.75 to 0.9.

GM

hth2412 3rd November 2005 01:45 PM

Thank you all, for your advise.
The idea came when I visited planet_10 (http://www.planet10-hifi.com/css.html), when using driver Adire's FS125s for mini onken. I though If possible replaced FS125s by Fostex 108 EZ.

I had already BLH so that why I want a bookshelf .

Roemhild 3rd November 2005 04:47 PM

2 Attachment(s)
Hi Hai,


I've got your mail and can say that the Fe108ES plays in around 6 liters closed or 12-13 liters BR.

here is a simulation with a horn for the the fostex with my method.

length: 0,55m
throat area: 30cm²
mouth area: 60*25 cm
rear chamber: 13 liters
exponetial


in a small room? why not? could be a try worth.


cya Till

coredump 3rd November 2005 06:16 PM

Till,

interesting idea. What was the mouth alignment in your sim? Front/floor terminated?

Best regards,

Oliver

Roemhild 3rd November 2005 06:30 PM

2 Attachment(s)
I am thinking of something like this.


I need more than 24h/day


Till

hth2412 3rd November 2005 11:56 PM

Quote:

Originally posted by Roemhild
Hi Hai,


I've got your mail and can say that the Fe108ES plays in around 6 liters closed or 12-13 liters BR.

here is a simulation with a horn for the the fostex with my method.

length: 0,55m
throat area: 30cm²
mouth area: 60*25 cm
rear chamber: 13 liters
exponetial


in a small room? why not? could be a try worth.


cya Till

Hi Till,
Thanks so much, I will try.


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