Fullrange Speaker Project

ejfud

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Joined
Jan 22, 2007
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Been an audio guy all my life and into wood the last 15 years or so. Building speakers is a way for me to blend my two hobbies together.

This speaker cabinet is designed for the Jordan JX92S. It is a fullrange speaker requiring no passive components to muddy the sound and has a frequency response which covers most of what the human ear can hear and very good bass. That's all I'll say about the hifi mumbo jumbo and get to the build.

Here is the cabinet with braces installed to keep the cabinet from resonating. The cabinet is made with Dominos and all panels cut with my TS75.
Jordans1.jpg


Next we have a picture from the back of the cabinet showing the front baffle installed. All seems covered with a silicon adhesive to keep the cabinet air tight. If you look close you can see where I put the Domino's on the wrong side of the panel...oopps.
Back.jpg


Here is a picture of the baffle before being glued to the cabinet. The black port in the bottom is removable in the case that we need to modify it's length in the future. The baffle is 3 pieces of 1/2" ply laminated together with the smaller piece fitting tightly into the cabinet opening and the outer a touch bigger than the outside of the cabinet. It was then routed to fit the cabinet.
Baffles.jpg


Cabinet glued up just before veneering.
Front.jpg


Backs with terminals in place. It is removable and held in place by screws into pleats inside the cabinet.
FordanBindingPosts.jpg


The baffle is veneered first in a figured maple and then a 1/8" piece of plywood is veneered in walnut and glued to the front. The extra 1/8" piece makes the driver flush with the front of the baffle.
JordanwithWalnutBaffle.jpg


Here they are getting their first test listen.
2580987020_f650dd040e_b.jpg


Here they are finished. Sanded with my ETS125 to 400 grit (man I love sanding without dust) and smooth as glass. Gloss tung oil finish.
Jordansfinished3.jpg

Jordansfinished.jpg

Jordansfinished5.jpg


The feet are made from solid walnut and a maple dowel. They have spikes screwed into the bottom to help stabilize them on carpet. They are screwed to the bottom for easy removal if necessary.

Veneering is done with the iron on method. I found some big sheets (4' x 8') of the maple on eBay. It has no backing so a little trickier to use with this method, but the results are good. Glue both the veneer and panel, let dry and get out your trusty iron. Don't use the wifes though you may get some glue on the business end of the iron, yes I have done it before and ruined her iron. Trim to size and sand. If you've never veneered give it a shot, I really enjoy it!

 
Nice Work, Gary

How do they sound?  Meet or exceed you expectations

Thanks,
Victor 
 
I would say they exceeded my expectations. Really do all types of music well. Image like crazy and have a very wide and deep soundstage.

They need more power than I thought they would, but after trying a few amplifiers, I think I've found the sweet spot for them.
 
Hi, Gary.  I don't know jack about audio, but have always been curious about building some loudspeakers.  I thought MDF was the material of choice.  No?  And you said the the Jordan JX92S didn't require "passive components."  What's a passive component?  (Obviously something other than the port, eh?)

Sorry for the newb questions, but "inquiring minds want to know."

Regards,

John
 
No passive components means no crossover. No capacitors or inductors for the music to pass through, the sound goes directly from the amplifier to the speaker. Crossovers are needed when there is more than one speaker driver in a speaker. This is a single driver speaker that produces the full audio range.

The choice of material for speaker building has been debated for ever. I've used both MDF and void free BB ply. MDF is a really dead material which some believe is what a speaker cabinet should be, some don't. I like BB ply because I believe that the cabinet should resonate some just like some musical instruments do. You just need to control them somewhat with bracing. Plus working with MDF is a real mess as I'm sure you know. Like I said, I've used both materials and have had good results with either.
 
Did you use software to figure out the best size and shape cabinet for the drivers? I always like this site:

Speaker designs made by home users

I think the  Kuze 3201's on the page link above are cool and of course yours are very nice!
 
Sure did for the size of the cabinet. WinISD is a great program for this. Here's how it modeled out.
jx92s-1ft-br-40hz.png


Shape is a little more subjective design. I needed to get the driver to ear level for best listening, so height was set. Just needed to play with the other two dimensions to get to a "good" shape.

PE is a great source for all things speaker related.
 
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