Project 10 loudspeaker (Kakamuka  *)

Project 10 is my own project, started circa july 2002.
It has nothing new in it. I liked all my projects, but every one of them excelled in one area and was weak in another.
I felt that I was running in circles around the sound I want.
Finally, I decided to make that final ultimate loudspeaker. I took the best from all my projects and put this one together.
I used readily available box from Project 6 with added scrap pieces of MDF.
From Project 2 I took the side woofer idea. I like it for many reasons.
From Project 6 I took the ATC mid-dome  and Raven 2 tweeter. From Project 7 I took the idea of using the midrange driver on open baffle. Here enters the so far never used driver - ATC 75/234 sc bass. In a four-way configuration, the dome and 234 form a perfect midrange.
They complement each other in a magical way. The 234 on open baffle is so damn fast that it re-defines the term fast driver.
It may seem odd, but the speaker has quite strange radiation pattern - bass is side firing and sealed, mid-bass is open baffle, midrange is sealed dome, and tweeter is a sealed ribbon. But I tried the mid-bass as sealed, and it does not sound nearly as good as the open one. Even if it is the only dipole in the pack - the whole presentation is dominated by its open and free character.

Project 10 is the number  ten projec of DIY loudspeakers.  It was then so superior to anything that I ve ever built before, that I thought this is worth publishing in detail. I believe, that many people around the world dream about  fantastic sound. They may be at the same time dreaming about the Stereophile class A speakers, which they will never be able to afford. The ticket to great sounding speakers costs in my estimate minimum 20 000 dollars. And many of speakers costing even more, lets face it folks, suck big time.
So coming back to P-10, these speakers cost approx. 1/10 of what they really should, are easy to make at home without too many tools and skills. Sonically they are better than anything commercially available that I was able to hear.  (They cost a little under 4000 USD a pair plus your labour.)
I hope that you will have fun reading this, and maybe you will decide to pick up the drill machine and make your own version. The chances you will be disdappointed are very very small.   ;-)


Project 10

I had to break all my own rules more than once - I used resistors, I made a four-way, and nothing  was simple about this design.
I spent 4 days with signal generators and measured this speaker inside-out. My fantastic new creation - the INSTANT CROSSOVER helped me significantly to make the XO right.


Because it is a four-way, I had a lot of freedom in setting the slopes and XO points. I tried to use only the best "part" of each driver. For example, the failure of Project 6 was a result of the dome being unable to make any good music in the 300-800 Hz range. In P-10 the dome enters around 800 Hz. From that point up it has no equal.
The first listening came as total shock. The sound was so good. Too good. The first XO has been here without any mod for 2 weeks and every day I listen for an hour or so and I still cant believe how well it sounds. Sometimes I bypass the R 4,7 Ohm in the mid-dome and the presentation is more open, more detailed, wider. I prefere it like that.
Compared to all my previous projects put together, P-10 excels in every aspect I can name.
1. The in-the-air suspended image - so free of speaker placement and so real, that I cant describe it.
2. Bass quality - absolutely fantastic. The bass has so much meat, power, weight, and none of the boooom boooom of lesser speakers. A good transient from a bass guitar can blow you off the chair.
3. Reality of acoustic sounds - applause, percussion, breathing - all comes so frighteningly real that I often laugh at my feeling that someone actually is in this room.
4. Overall energy - the sound is very very energetic. It rocks and swings and kicks ass just as I remember from live jazz club performances.
5. Low distortions - this loudspeakers is very audibly free of distortions and compression. It sounds just fundamentally right. Sound is clear, clean, crisp. If you are into audio, you would describe it as a million dollar sound. That is the first impression I have.
The ultra-microscopic approach to revealing the recordings does not make the music sound bad at all. On the contrary, this works like a microscope with rosy lenses - every recording  sounds better than I remember.


* Kakamuka is a buddhist word for something like a good spirit in the house which  is probably very feminine in nature. Or so I was told.


Tweeter - change for Raven 1 or S-s 9700
ATC: use normal dome, not super
Total savings: maybe 540 USD
Total bill for normalized version: 2990 for a pair.