Fostex 206EN Small Sealed Enclosure

[AVBeginner]

First post so go easy on me!

I have a pair of Fostex FE206en full range drivers, which I previously installed into a pair of self-made double bass reflex type floorstanding enclosures. They were fine for a time but have been sat for a couple of years unused gathering dust.

I’m looking to re-use the drivers by sealing them up in small stand mount boxes, using a couple of separate powered woofers to fill in the bass.

Can anyone recommend a suitably small enclosure size?

 

[planet10]

About 5 litres damped… with that small a box you may have issues fitting the driver in the box. XO 2nd order to the woofers at about 165Hz.

I have a miniOnken for these that gets a bit more on the bottom (almost 100 Hz). email me if interested.

FExx6x/xx8e∑ do not do well in a BR as far as extension on the bottom goes.

Bottlehead has/had an article on using FE166 and doing sealed to subs.

dave

 

[freddi]

if the amp driving the 206en has low output impedance, than a 250uF low loss capacitor could kick up the 100Hz output using a 5 liter closed box;

206 are very punchy in Karlson K12/

it the amp has any significant output impedance, the trick will not work.

 

[MPM]

Bottlehead has/had an article on using FE166 and doing sealed to subs.

dave

I remember that article from 10 plus years ago. Interesting and simple to try. They liked the results considering the relative low cost to implement. Got me thinking about this again.

 

[AVBeginner]

Wow that’s small! 5 litres internal volume? So roughly a 20cm cube made with 15mm mdf.
I was thinking a little bigger - maybe around 15litres?
Is there anything in that range that would work?

 

[GM]

So use 15 L and sub 4-5 ohms in lieu of Freddy's 0.2 ohms to flatten/extend it a bit lower. 😉

GM

 

[freddi]

if vented, a 14 liter chamber reflex box might be like so:

 

[planet10]

Wow that’s small! 5 litres internal volume? So roughly a 20cm cube made with 15mm mdf.

5 litres requiring careful consideration of the volume of the actual driver. As volume goes up the box Q drops (unless you do as GM suggests), eventually very slowly. A slower rolloff means a less easy to deal with natural rolloff if you want ot use it as part of the filter.

I would not use MDF, and a box this small is probably better in a “dagger” shape.

dave

 

[planet10]

Here are the 9 Litre vented dFonken Centre channel box for the FE206En.

http://www.planet10-hifi.com/downloads/dFonken206-centre-190118.pdf

Intended for those who have FE206En in big horns for L+R. But will give an idea of a vented box that works. Meant for a typical amplifier. F10 about 90 Hz.

dave

 

[AVBeginner]

Appreciate the advice, thanks. I’ll give it a go. Marine Ply ok?

 

[GM]

If it's rated 'no void'; it use to be a given, but some years ago I learned the hard way it's not. 🙁

GM

 

[Vix]

Maybe the cheapest way to try it would be a foam core sealed box; just to hear if it's worth it. But, 206's magnet is quite heavy, hope the foam core is strong enough to hold the driver...