As I notished, my visitors are quite international / global, I will try to write this article in English. So please forgive me for my poor English writing skills.

A pair of "Milestones" in a nice Birds-Eye-Maple coat was something I had in mind for a long time. Now I found the time and spirit for it, so let's started. This time it will be published including the X-over schematics which is developed by  "Marc Heijligers" (Holland) , and fine tuned over the last year's. Marc has put an enormous  amount of spare time and energy into this X-over, and I can garanty it is a firts class loudspeaker in combination with this X-over. If you want to go deeper into the technical specs and/or history of Marc's journey, please visit his site;

  "HifiVoice"

There is also more information on the Dutch HTforum;    (in Dutch)

This speaker needs a decent amplifier, so isn't suited for low power tube amplifiers. A good steady amplifier will bring this speakers to live, and wil deliver you a very high-quality of sound! I have heard this speaker in the past, when I visited Marc Heijligers at his home, and I must say it is astonishing how fast and powerfull these drivers are. It will produce a wide stereo immage, and very good 3-D accoustics, suitable for all kinds of music with no exceptions...

Pay attention;

This is not a beginners project, the cabinets are not that easy to make, and drivers / X-over parts won't be that cheap too.... So if you're planning to build a nice D.I.Y. speaker, and you're skills / budget aren't sky high, please start building a nice (monitor) stand mount speaker.

For a full size metric cabinet drawing, click here.

As I published this loudspeaker before on this site, I won't go to deep into describing this cabinets. Use first class 30mm high pressured (680 KG/M3 ore more) MDF plates. All panels are pre-cut, including the 4 triangle facettes on the baffle. Remind, there are only a few 90 degrees angle's in this design, as the cabinets are tilt 9 degrees backwards.

The picture left, shows some front view dimensions including driver placement. All drivers are flush-mounted, and fixed with metal inserts/screws.

 

Including the 30mm high foot, this speaker measures almost 105cm high (some 41 inches), 26cm width (appr.10 inches), and 40cm depth (appr.15.75 inches)

 

Left side panel drawing, notice all 4 facettes will have different dimensions/cutting angles! Only miter sawed panels wil guarantee a plane surface. This is a must, when veneer wil be aplied later on.

Recommended (by Marc) X-over components;

Coils, use Jantzen wax coils found here, http://www.jantzen-audio.com/html/coils.html

Resistors, use Dueland carbon resistors, http://www.duelundaudio.com/Resistors.asp

Compared to other types, these components deliver a more coherent and harmonic fluent sound.

Capacitors, use Audyn Cap Plus, except for the tweeter cap this one should be Audyn Cap Plus Gold/Silver.

Where most other caps start to sound shrill or on the contrary dull, these caps sound very live-like without an edge to the sound. These are no general recommendations for components, they work well in combination with the Thiel Ceramic units and the Milestones filter.

 

Electrical stage;

For a higher resolution picture, please "click" on the drawing below.

Please don't ask me about the technical details about this X-over, as I haven't designed it myself. My knowledge about this is not sufficient enough to answer you're questions. More technical X-over info and details about damping (-materials) can be found on Marc's site;   www.hifivoice.com

However for mechanical questions, I will try to help you.

The drivers used in this design, are from the German company of  "Thiel & Partner" a.k.a. "Accuton".

Tweeter; C25-6-12

Mid;       C90-6-79

Woofer;  C220-6

I never trust on the i-net parameters regarding drivers. I have some bad experiences in the past on this. To be sure you cut-out the right driver hole, first check on the exact dimensions! Particularly Accuton turned my hear into grey about this. The 2 woofers (C-220) I received appear to have different screw holes. One had M4 holes, the other one M5. So I had to drill one up to fit M5 screws!

Drivers will be fixed ,using these metal inserts. These have metric thread inside, being M4 for the tweeter and mid driver, and M5 for the woofer drivers. I mount them using fast seconds glue, which hardens the MDF around the inserts.

Cabinet's are venered using real 0.6mm Birds-Eye-Maple book-matched veneer. This veneer has no paper back, meaning it is very vulnerable, and will easy split/burts.. I alway's use white wood glue D3 quality (= water resistant), to attache the veneer to the MDF panels. Abundant glue has to be removed quickly with clean water ,to avoid spots.