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Old 15th April 2013, 11:41 PM   #1
tilroh is offline tilroh  Australia
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Question Suggestions for Enclosures for 103EN

Thanks to this addictive forum I've built pair of BIBs, Needles and another that I've forgotten the name of.

Anyway, a friend of mine has also become infected and in order to enable him I've volunteered to build boxes for his new Fostex 103ENs.

Can anyone recommend a simple build? They will be powered by a 8w SET.

Thank you so much,
Mack
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Old 16th April 2013, 12:13 AM   #2
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I have not heard one but the Woden Design Sperrin looks exactly what you are looking for.
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Old 16th April 2013, 01:31 AM   #3
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The simplest is the 6-liter factory bass-reflex cabinet, tuned to ~80Hz. If you mount the boxes on a shelf (i.e., near the wall), you won't need BSC. They are an excellent match for SET and 8 watts is plenty (I'm driving them with just 2 watts and it's totally workable for me.)

P.S. If you calculate the port so that it consists of several 1" or .75" holes, on the back, you can actually get away with zero stuffing. I used Unibox but almost any program will work. (The small size of the holes plus the rear location serves to low-pass the ports to a surprising degree.)

Last edited by rjbond3rd; 16th April 2013 at 01:34 AM.
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Old 16th April 2013, 01:40 AM   #4
tilroh is offline tilroh  Australia
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Quote:
Originally Posted by rjbond3rd View Post
The simplest is the 6-liter factory bass-reflex cabinet, tuned to ~80Hz. If you mount the boxes on a shelf (i.e., near the wall), you won't need BSC. They are an excellent match for SET and 8 watts is plenty (I'm driving them with just 2 watts and it's totally workable for me.)

P.S. If you calculate the port so that it consists of several 1" or .75" holes, on the back, you can actually get away with zero stuffing. I used Unibox but almost any program will work. (The small size of the holes plus the rear location serves to low-pass the ports to a surprising degree.)
Thanks rjbond3rd, That sounds easily done. I'll search the Fostex site.
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Old 16th April 2013, 02:24 AM   #5
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Cool, there's a diagram which comes on a sheet of paper in the driver box.

I should have mentioned I'm using a sub. The speakers roll off at 80Hz, then there's a room mode at ~70hz, and the sub comes in around 60Hz (a not very effective way of dealing with modes, because the bass response still varies quite a bit as you move around the room).

The FE103En are amazing for the money, but also (cost aside) still amazing because they are basically a tweeter with pretty wide dispersion that can play down to ~80Hz. Tone is great, sound is pure and clear, exactly what most SET people are looking for (all the usual caveats apply of course).
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Old 16th April 2013, 03:59 AM   #6
tilroh is offline tilroh  Australia
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Has anyone heard the-

mFonken
or
ZigmaHornet ML-TL
or
GM designed ML-Voigt

on Dave's frugal-phile site?

Thanks, Mack
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Old 16th April 2013, 05:10 AM   #7
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Quote:
Originally Posted by tilroh View Post
Has anyone heard the - mFonken103
Yes, I had a prototype pair on my desktop some time ago. They are quite nice.

jeff
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Old 16th April 2013, 09:06 AM   #8
DrBoar is offline DrBoar  Sweden
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and MJ Kings compact basshorn, there is a detailed thread here about that horn/pipe using a 4" Tangband driver
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Old 16th April 2013, 09:41 AM   #9
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If you want simple, then a BR is likely to be about the easiest option, although I have rather strong reservations about the design Fb of the Fostex box -not the best alignment I've ever seen. Nor am I entirely certain what is being referred to above about multiple smaller holes 'low passing' the port, which sounds like a new type of physics to me. If you have high aspect ratio vents, the friction will make them increasingly resistive and eventually shift the box toward something akin to a leaky sealed alignment (what's usually called aperiodic, though the definition isn't strictly true). This will not in my experience obviate the need for some internal damping -for example, its effect on possible unwanted internal reflections coming back out through the cone is roughly equivalent to the square root of jack.

FWIW, if you dropped the FE103En into the 6 litre box Fostex publish, given that you say it'll be on the end of a SET amp, I'd be more inclined toward tuning it to ~75Hz. The output impedance of most SET amps varies between about 2.5ohms & 4ohms; with the stock tuning you get a considerable peak at Fb. This sounds impressive initially, but quickly becomes tiresome, especially if room gain lifts it still further (likely in many cases, especially if placed near boundaries). Going for a 75Hz Fb should provide slightly better damping on the bottom end, and also prevent the box unloading quite as much since as a simple reflex enclosure, there's little to control excursion below the tuning frequency. Won't sound quite as impressive initially, but likely easier to listen to over the long run.

The Zigmahornet has a decent midband given that there's just about no baffle, but is poor on the bottom end -step-loss is something chronic unless rammed right up against a wall, and it's tuned way too low IMO. Frankly, I wish it did work since they're rather attractive boxes in their own way, but there are better boxes out there.

GM's ML-Voigt if memory serves was for the defunct RS 1197, the 103 might go in, but I don't have time to check right now to see what the behaviour will be like.

The mFonken is a different box type altogether, being closer to the type of leaky sealed box I mentioned above. It won't put out much LF gain, but it's not designed to; it'll be fairly damped on the bottom end, but a good match to a couple of subs.

Hope some of that helps.
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Old 16th April 2013, 10:45 AM   #10
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Hi Scott,

Thank you, I'll try improving the tuning on the next iteration, although it seems pretty on already. For this very humble build, I didn't use the exact Fostex dimensions. I used a 6.6 liter ~golden ratio box tuned to 80Hz as confirmed by an impedance sweep. Just for fun, I used The Edge to offset the drivers (mirrored pair). I didn't see a peak at Fb but if so, I will re-size / re-tune (these boxes were intended as junky prototypes but they sounded much better than expected).

I know nothing of physics but the four .75" rear-mounted holes offers less comb-filtering of midrange leaking out of the port, or so goes Dr. Miyagawa's rationale. The holes are drilled into a solid block of wood inside the box (the so-called Miyagawa vent). (I will post measurements when I can get back the laptop which has the Windows software).

Surely these boxes can surely be improved further. I'm looking to put a huge roundover on the edges if only for fun, can't hurt. If they aren't yet optimal, at least they are incredibly good, much better than anything I've had to date but I don't listen to rock at all.
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