Gentlemen,
Mongo, Paul ( the CEO );
Chris Chris (the wunderkind) , your opinion will be very interesting to me, тhank you for your efforts!
Joro
Joro,
My opinion of your project is that it took a lot of time, effort, and skull sweat, but they are beautiful, and you should be very proud of them. You are a very creative person, and you are a welcome addition to the forum.
Honest Injun,
Mongo
2 Likes
So, I continue the topic.
I am approaching to the measurement of the internal volume. From waste material I made this gadget, that takes part in the measurements and when assembling the cabinet;
The two shells of the cabinet, I covered them with aluminum foil;
The new one project;
After preprocessing of the internal ribbing I can now start collecting the cabinets;
Now I can make the exact measurement of the volume.
And that’s 31.5l, just as much as I need!
3 Likes
More;
Ribbing processing should not be underestimated!
Housing assembly;
Oh, i forgot to show you what I make for the filter compartment!
6 Likes
And;
Polyurethane primer before veneering;
After the measurements, this is are Technical data:
2½- way surround loudspeakers,
Frequence Range; 33-25000 Hz
Long term Max Power; 200 W
Crossover Frequency; 2800 Hz
Impedance; 4 Ohms
Sensitivity; 90 db SPL
Cabinet Volume; 31l
Gross weight / without stand /; 27kg.
This is the project of the rear speakers, will finish it with “Bird’s eye view”.
A very underestimated moment - work with multilayer MDF material! Always been a problem with the MDF, especially when we have a multilayer construction. I will open an interesting /for me/ topic, the seasonal movement of the MDF material.
You assemble all of details in construction, everything is fine, but after two or three seasons, you can see all details, similar to this item: I show you a German site, that offers such “DIY loudspeakers -cabinet construction” and please, for your attention, they want money for such a product;
9 Likes
I’ll show you what is my solution to this problem, for more than 10 years, everything looks like it was at the beginning. Position start phase of project for the stands,on to the rear speakers ;
After assembling, I make a whale, with MDF waste material and a polyurethane primer to coat the workpiece;
Next part - painting with acrylic spray, I need to get an idea of the lines of detail (they are many) and how they will look, with the finish acrylic auto varnish;
This is the “explosive” device with a time delay if no preventive measures are taken … The layout of multilayer MDF is very well visible, with the lacquering problem only going away in the near future.
…
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Amazing workmanship!
Thank you, Baldy!
Those organic shapes are as much art on the outside as they are science on the inside.
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Impressive craftsmanship, and absolutely gorgeous.
These are not my current speakers, nor did I build them. I commissioned Rick Craig from Selah Audio to build this custom design for me. The Seas drivers are some of the finest, imo.
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^ " Impressive craftsmanship, and absolutely gorgeous."
Thanks!
‘‘The Seas drivers are some of the finest…’’
I’m agree.
1 Like
The measurements were done in a lab, the result was very good, but I decided to change the project - 2 1/2, to a three-band body by releasing one speaker W18EX001 and replacing it with W12CYoo1, the project already looks like this:
The dimensions at the base of the stands reminded me that there I can place / after additional processing / the bass filters and the middle speakers, for now - an idea.
to be continued…
5 Likes
Shouldn’t be! A pyramidal shape is really one of the easiest ways to reduce standing waves / back waves especially if it’s a tetrahedral shape - the pressure inside the cabinet hitting a corner primarily is very good for nulling back waves. (Found a patent on this even, a pretty old one, so this has been figured out a long time ago yet we see mostly “boxy” cabinets today, hmm.)
Taken further if we had a regular tetrahedron this would be best achieved, but your design surely addresses the internal pressure very well. Gorgeous curvature!
I wish I had even the most basic tools for making cabinetry, I have a design almost ready (tetrahedron based), drivers selected… Would be such fun to build my own design myself buuut, gotta outsource it.
(Anyway it’s 2k€ for the parts and materials for a pair, so → eventually)
Thank you very much for evaluating my project, really! You are in the DIY things inside, thank you!
In fact, my construction is very far from the pyramidal one and you were the first / except in the BG- DIY Audio Forums / to comment on it in the most correct way, thank you!
P.S.
I’ve always tried to create an egg shape in my projects because I can’t make a sphere.
I could help you if you lived on the next street, I’m sorry!
Greetings, Joro!
Well actually, seeing that photo, I was reminded… I do have most of similar tools somewhere tucked away in the house, just haven’t noticed their existence in years so simply forgot… damn.
In the summer I’ll clean out a room in the yard shed where there was a wood workshop a long time ago. Will have to get to work with the cabinets then or I’ll be disappointed in myself. Pretty sure I can’t afford the drivers even then (that’s three full-range woofers and two bass woofers per speaker, not cheap…), but having the cabinets ready would be something.
My design (if it works) would be one that gives a very good and even power factor (net distribution of frequency range in the room) due to the tetrahedral geometry with the omnidirectional approach applied, and basically coupled to a relatively compact isobaric bass chamber. AND the nulling of standing/back-waves due to geometry is a great bonus that’s actually a requirement in this case because there’d be three full-range drivers (response from 70Hz up) all loading one tetrahedral chamber. This would not be easy to manage without this geometry.
Thought to write this out because you might be interested, though I’m not sharing it in detail here until it’s ready and works.
(Though if you are interested I can send you more details via PM)