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I'm building an SO Imperial (Read 15239 times)
Young_SC
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I'm building an SO Imperial
10/01/07 at 10:06:53
 
Hello Gents,

Having been kindly provided with the desired dimension for Brace A, I've started building the cabinet.

I've cut the outer shell except for the top piece (would have done them all but I followed the wrong script and measured once, cut twice Sad)

I've made one Brace A which can now be used as a template for the others.

Following some more of Zygi's advice on another thread for making Brace A, I've decided to take some photos to provide others with a visual cue who may want to tackle the project.  I'll also take other photos along the way as I get around to doing more work and as I remember to get the camera out for those, like myself who enjoyed Randy's escapades.

I drew the Brace A shape onto a piece of MDF, cut around it with a jigsaw and then nailed a straight piece of wood along each line to allow a flush router bit to do the work of cutting the straight line.






Note: Zygi's instructions were to use a pin nail arrangement to hold the straight piece.

1) I didn't have any small nails handy
2) I was going into MDF not ply

I'm not worried because the piece will be out of sight.

Simon

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paulc
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Re: I'm building an SO Imperial
Reply #1 - 10/01/07 at 11:32:40
 
After listening to Randy's SO's, I'm here to tell you that your efforts will be rewarded.

dennis
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Young_SC
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Re: I'm building an SO Imperial
Reply #2 - 10/06/07 at 06:42:12
 
Brace A's cut.  Need to buy some screws etc before assembling the main box.

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Young_SC
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Re: I'm building an SO Imperial
Reply #3 - 10/14/07 at 08:34:54
 
Brace A's all cut.



Outer box partly assembled


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Marantz CD 63KI (modded)
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Young_SC
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Re: I'm building an SO Imperial
Reply #4 - 10/14/07 at 08:39:57
 
Question for those more experienced.  I've bought a 12" woofer instead of the usual 15".  

The picture below shows the 15 incher against the 12 incher.  Should I position it so the bottom of each speaker are in the same place (Diagram A) or should I position it so both centers would be in the same place (Diagram B)?

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Bart_West-VL.
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Re: I'm building an SO Imperial
Reply #5 - 10/14/07 at 09:27:59
 
I vote to put it in the center (B)
The sound will be in the same placement as if it was a 15"

With the little man in there, it really shows the size!! Shocked

B.
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Young_SC
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Re: I'm building an SO Imperial
Reply #6 - 10/15/07 at 01:01:36
 
Hi Bart,

That's my thinking as well, the only consideration that prevents me from going down that path is the 'making sound by blowing across a bottle top' effect which loads the horn.  If the speaker is too far away from the start of the horn, I'm worried that I won't get much bass coming from the horn mouth.

Simon
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Bart_West-VL.
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Re: I'm building an SO Imperial
Reply #7 - 10/16/07 at 16:25:28
 
I think you might have to scale the Karlson slot down to fit the 12" driver.
I'm pretty sure about it, but please mail Steve to be sure.

B.
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ZYGI
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Re: I'm building an SO Imperial
Reply #8 - 10/24/07 at 03:57:41
 
Simon,

  I can't give you a definitive answer here, but one would think the slot would have to be scalled back, at least the start point which matches up to the inside dimension of the 15" driver.

I would suggest, if I was trying it, build the front plate with an adapter which would accept the 12 driver in the 15 inch hole, that way if it doesn't work a whole new cabinet wouldn't have to be built, You could also make the 12" hole offset, much like your "A" drawing up above. This would enable you to rotate the adapter around until the correct placement was found. Or if all else failed, you could install the 15"er like the plans call for.

BobZ
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« Last Edit: 10/24/07 at 04:00:17 by ZYGI »  

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Gexter
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Re: I'm building an SO Imperial
Reply #9 - 10/24/07 at 04:15:20
 
Now we know one more reason Bob builds Decware speakers.
:)
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Young_SC
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Re: I'm building an SO Imperial
Reply #10 - 10/24/07 at 10:28:48
 
Thanks Bob,

You're a Champion!!

I'll use option A and reduce the size of the K-Slot to be the same size as the 12 inch driver.

I might just screw in the panel that holds the driver in case it doesn't work, it's probably easier with my skills.

Simon
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Young_SC
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Re: I'm building an SO Imperial
Reply #11 - 10/24/07 at 10:31:22
 
And thanks Bart, your advice on the K-slot has been confirmed.
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Marantz CD 63KI (modded)
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Randy in Caintuck
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Re: I'm building an SO Imperial
Reply #12 - 10/24/07 at 14:07:48
 
paulc wrote on 10/01/07 at 11:32:40:
After listening to Randy's SO's, I'm here to tell you that your efforts will be rewarded.

dennis


Howdy Simon,

As paulc observes, I'm thinking that you will be pleased with your project .....  8-)

I'm running my SOs a little differently than at first.  Instead of running them in parallel with the Parker Audio Behemoths from the Decware Select, I have a pair of small plate amps that are driven from the speaker taps of the Select.  Since purchasing the CSP2, the main speakers go a LOT lower and fill in the upper bass frequencies that the SOs were previously handling.  With the SOs crossed over at 40-50 hz in a stereo configuration, the blend is very fine indeed ..... and things like the lower strings of acoustic or electric bass, lower keys of piano and kick and kettle drums have a wonderful fullness and presence .....  :)

Please keep us posted on your progress.

Best wishes,

Randy
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Young_SC
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Re: I'm building an SO Imperial
Reply #13 - 11/18/07 at 07:27:04
 
Haven't been devoting an enormous amount of time to the project, but have made some small progress.

Main box with Brace A's cut, but not fixed.  The strips resting across the top are for the two braces running top to bottom along the back of the cabinet.




Picture of the inside cabinet (not my finest effort).  Need to go at it with a belt sander especially the panel extending out the top.




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Marantz CD 63KI (modded)
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Valiant
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Re: I'm building an SO Imperial
Reply #14 - 11/18/07 at 14:27:30
 
Howdy Simon, I can hear it already from here. Great work.
Have you ever heard the Imperials? There are two in Perth,
but I don't know if Jake is actually using them, I will be catching up
with him soon and find out wazzup.

What finish do you have planned for the MDF?

Cheers,
Gaz
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