The Fountek Five for FR88ex

[chrisb]

Now that's what DIY is all about
Post some more photos and impressions from your session

 

[chuyler1]

Will do!

 

[Bigun]

I can share that my experience with this driver has been positive. The bass performance, given it's size, is very impressive. I built mine back in 2010 using a small desktop design with an unusual port design - easy to build but it has a horn type of shape to it. Sitting on a desk it gets good boundry reinforcement. It has Golden ratio internal dimensions and a pair of them can be cut from one 2' x 4' sheet. I'd say go for it - you won't be unhappy with this driver if used within its capabilities.

http://www.diyaudio.com/forums/full-range/175056-martello-enclosure-fr88ex.html

 

[zman01]

chuyler1,

Nice work, especially the desktop speakers!

 

[kevinr]

Thanks Dave , appreciate your post on this

 

[MadMaestro]

Hey there! I'm interested in building a pair of the unfolded fenceposts. On the plans, is the driver made out in dashed lines below the solid one meant to be an alternate placement of a single driver, or is it meant to be the placement of a second driver, I.e. installing two 4ohm fr89ex in series?

Thanks!
MM

 

[planet10]

Hey there! I'm interested in building a pair of the unfolded fenceposts. On the plans, is the driver made out in dashed lines below the solid one meant to be an alternate placement of a single driver, or is it meant to be the placement of a second driver, I.e. installing two 4ohm fr89ex in series?

It is a one or the other situation, the dotted placement is best for minimizing ripple in the FR, the solid location puts the driver at a more appropriate height for a typical listening position.

dave

 

[MadMaestro]

Dave, thank you for your reply! I wonder what a 2 driver or even a line array of these could be like... =D

 

[planet10]

I'd think of spending the money on a better driver 1st.

dave

 

[MadMaestro]

Haha, fair point!

MM

 

[chuyler1]

+1 These were a fun project as a gift but I have much better sounding speakers that didn't cost all that much more. They aren't bad when mated to a powered subwoofer though.

 

[BeauB]

Would it be possible for someone to describe the alternate port on the BR/ML-TL Hybrid?

Is this simply a 10mm opening running horizontally across the bottom, or am I a bit mixed up?

 

[planet10]

Would it be possible for someone to describe the alternate port on the BR/ML-TL Hybrid?

Is this simply a 10mm opening running horizontally across the bottom, or am I a bit mixed up?

You got it. A rectangular vent that is equivalent to the triangle.

dave

 

[Maupastor]

Sorry for waking this old thread: are the cut corners needed on the 'Ken-Lite?

I am looking for a box to adapt to a tabletop radio project, a kind of modern version of my old Beomaster 900K ( Beomaster 900K ) and that would mess with my design.

 

[chrisb]

If you meant the beveled vertical edges, on many of Dave's designs those are in effort to reduce edge diffraction, but we have no hard measured data to confirm how effective that is, and any subjective evaluation would be exactly that - confirmation bias at work, methinks.

So, short answer would be no.

 

[planet10]

The small bevel makes a potential difference only at the highest frequencies and given that the FRs are beaming at these frequencies, they become mostly cosmetic. They give a cosmetic look that harks to the much larger, much more effective champers on our full-on miniOnken boxes.

dave

 

[grahamgraham]

Can the ports on the folded and non-folded fence posts be adapted to other shapes? As close as possible to the original location? Like, a circle?

 

[planet10]

Position is important, cross-section area is important, shape not so much.

dave

 

[Olivetta]

hi,

I have a question.

I have 4 fountek fe85

and I am looking for this project.

it could be posible to reduce the one side and increase the other?

like is possible to make it more flat?

Thanks for the answer

Andrea

 

[Bigun]

These FR88EX's are great little drivers. I made my own box design (search up Martello) but it's not that different from what you can see in this thread. Highly recommend you try it - not the latest in micro-detail for some people maybe, but I'm hard pressed to find any issues - to my ears it is quite neutral so it doesn't have those little 'excitables' in the presence region that for some fold give a speaker a bit of detail but for me tend to irritate. No experience to offer on the FE85 though.