I like speaker building and this is one of my projects - very good sounding and looking 2- way bookshelf speakers.
Some measured parameters:
Impedadance: 8 Ohm
Sensistivity: 88 dB / 1W / 1m
Cut out frquency: 2 200 Hz
Frequency range: 32 - 28 000 Hz
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Step 1: Materials and Building
I decided to use 40 mm thick MDF for building. At the first I have thinking about the shape of the speakers. Then I just drawed the shape in CAD software to have the files for CNC machine. Make it by hands is possible, but not very funny.
Making a columns from the tiles. As you can see on the pic I have needed 16 pieces to make two cabinets. It is simply layed and glued together. After adhesive curing I have sanded every sides of the cabinets to smooth surface.
Now we have two cabinets to making loudspeaker boxes.
The most funniest step in this project was veneering for me.
Step 2: Veneering
Just pick some sheet of venneer and glue it to the surface... : )
I decided to make veneer from ONE sheet of piece. Glue the strips of veneer is very simple to me. No, I must make some original! So, I toke the veneer sheets to my friend who is owner of laser shop and we have made some cuts to my sheets. Aplying with contact glue was not very easy but we tricky makers can do it in 4 try. After this procedure you must go to your lovest pub and make a little reset ... But you are king of the world.
Then (in two days) you are ready to make next steps. Front panel is laserable Aluma Mark glued between weneer on the front. It makes very nice contrast and very nice it sits with aluminium basket of Peerles mid-bass speaker.
And we can roting the mounting holes for drivers.
Step 3: Holes and Surface Finishing
Great tool for making the holes you need is my circle jig for router. Instructable to build one. You can make me happy by voting. It is easy way to make really perfect circles for speakers.
Now we can lacquer the surface of the cabinets. I choosed the nitrocellulose lacquers to finishing. The base coat in 3 layers and 2 layers of half shine lacquer was applied. At the end I have polished the surface with Autoglym Paint Pro system.
Step 4: Assembling and Completing
To complete the project we need to make a crossover. Schematics is classical 2 - way crossover with of Linkwitz with cut of frequency 2 200 Hz. Important thing in the crossover is L-pad for the tweeter to reduce his sensitivity about to 10 dB. I have use the foil coils and MKP capacitors with no inductance resistors cause it is High - End project.
For the SP 18 passive radiator I have place a weight 34 g according to Seas documentation.
When the work was done, hearing time is coming. The next week I have big fun by tuning the sound with the right ammount of damping material finding (lamb wool).
Step 5: The Sound
I try to be objective.
The sound is really perfect. Deep and accurate basses, mids are very nice painted and the words can be very good recognized, tweeter sounds silvery clear.
I am very satisfied with this project.
Participated in the
DIY Audio and Music Contest