Welcome, Guest. Please Login or Register
Decware Audio Forums
08/22/14 at 14:55:03


Pages: 1 2 3 
Send Topic Print
Mr Valiant's Half Imperial (Read 14944 times)
Valiant
Senior Member
***




Posts: 89
Mr Valiant's Half Imperial
11/09/07 at 14:34:07
 
Greetings guy's, I'm going to keep this message brief, as I
tried to send a message earlier that seems have got lost in cyberspace Sad.

With the sheets of board left over from mine and Jake's metric Imperial, I've
started building a 'half Imperial' for my son, who is currently studying music
and plays guitar and bass guitar.

So, I'll call it quits for now. Disappointed that my original post appears to have gone
nowhere, but I'll post more details and pics if all is well.

Hi to you all, Smiley

Gazza (Valiant).
Back to top
 
 
  IP Logged
Valiant
Senior Member
***




Posts: 89
Re: Mr Valiant's Half Imperial
Reply #1 - 11/18/07 at 14:13:10
 
Here's a pic of the speaker box... I've set it up so as I can change the front
panel to try a variety of drivers. Initial set up will be 4, 8" woofers I've
had lying around for  a little while now.
Gaz
Back to top
 

DCP_0001_3.JPG
  IP Logged
Valiant
Senior Member
***




Posts: 89
Re: Mr Valiant's Half Imperial
Reply #2 - 11/20/07 at 22:40:06
 
Dad popped over on Monday and with a couple of hours work,
here's the result... Smiley
Back to top
 

HalfImpSpeakers.JPG
  IP Logged
Valiant
Senior Member
***




Posts: 89
Re: Mr Valiant's Half Imperial
Reply #3 - 11/20/07 at 23:04:15
 
I haven't yet painted the outside of the cabinet and finished all the trimmings,
but there are only a few more hours work left to do. Fired her up of course and had
a quick listen, not too loud Wink. The Half Imperial still goes deep, plenty of
twenty hertz stuff vibrating various items on the patio, even more at thirty hertz.
Musically, she has a good spread across the audio range. It would be interesting
to do a few tests in that department. Vocals are clear, and even cymbals are
quite audible, though I feel the SPL is dropping off around 8000Htz or so.

But enough of the tech talk for now. My only dissapointment is that I didn't build
a stereo pair. Sizewise alone, they are a more civilised version of the 'Full Imperial',
and still deliver (though at a more reduced SPL). As they are, they will be
suitable for my son's guitar, or for that matter any stage application. I'm looking forward
to trying different drivers. The current 8's are garden variety cheapies, better
ones are on the cards. At a pinch, I may be able to squeeze in 4 x 10"s, possibly
2 x 12"s. We shall see Grin.

Until then, here's another pic, with a certain item to give it some scale.

Cheers,

Gaz
Back to top
 

For_Scale.JPG
  IP Logged
Young_SC
Seasoned Member
****


I love Decware 1G -
SP1!

Posts: 111
Re: Mr Valiant's Half Imperial
Reply #4 - 11/20/07 at 23:54:45
 
Hi Gaz,

That's a good looking speaker.  

You've got more guts than me, I haven't got the experience to build stuff from theory.  I rely on tried and tested plans to copy.

When it comes to finishing the rest of the cabinet, consider keeping it a light colour.  There is a nice contrast with the black front and horn mouth against the lighter colour of the outer cabinet.

Simon
Back to top
 
 

Marantz CD 63KI (modded)
Monica 2 DAC with I/V output stage
ZBox
Decware SE84CEX
Homebuilt HDT's with doughnuts
Enamelled copper wire IC's with Eichmann plugs
Enamelled copper wire speaker cables
Young_SC   IP Logged
Chris K
Seasoned Member
****


My owner only hears
to 16K WELL I can
hear to 60K!

Posts: 257
Re: Mr Valiant's Half Imperial
Reply #5 - 11/21/07 at 18:18:26
 
VERY COOL!
Explain please how it is half?
All heights different in the pic with the beer bottle. And it seems much narrower. Mouth is not square but what are the mouth dimensions? Or is it indeed all the same just cut in half down the front view?
Back to top
 
« Last Edit: 11/21/07 at 18:22:34 by Chris K »  

Hi-Fi Gear: More than I need! Not as much as I want!
  IP Logged
60_and_up
Seasoned Member
****


kids should live.

Posts: 933
Re: Mr Valiant's Half Imperial
Reply #6 - 11/22/07 at 01:55:06
 
Back to top
 
 

Peace hath higher tests of manhood than battle ever knew. ...
  IP Logged
Valiant
Senior Member
***




Posts: 89
Re: Mr Valiant's Half Imperial
Reply #7 - 11/22/07 at 03:20:28
 
Hey 60, I checked out your totally cool clip a while back and I'm still laughing  ;D Grin Grin
I've just shown it to the family and they reckon it's totally cool too! From the looks it's about 1:4 or 1:5 scale? I'm tempted to do the same, maybe a 1:10 scale and fit a AM/FM radio in there, just for fun. Maybe we can have a competition to see who can build the smallest, functional,to scale Imperial Wink

Hey Chris, allowing for the fact that I was using 18mm chip instead of the preferred 3/4" ply, I cut the speaker chamber braces to size, and used a ratio of 18.5/19 x 'Decware Plan' to give the appropiate horn dimensions.

This gives me a speaker 7/8" shorter and 3/8" shallower than the plan. The width of the box is a whisker less than half the true Imperial.

A single jarrah wood brace secures the rear of the horn, and is a nice touch too. Eventually I would like to use a fine piece of jarrah ply for the 'speaker panel'. This is one item that will get extra reinforcement in the shape of some angle iron braces. The speaker panel is all holes and can only benefit with some extra stiffness.

I agree Simon that a lighter colour on the outside of the box would be a good contrast to the dark interior, but I'll probably finish the outside with the black hammer finish, if only to match my existing speakers and in keeping with a common theme.

Looking forward to seeing your SO. Looking good.

For those who have forgot, here is a pic of my original Imperials...
Back to top
 

DCP_0002.JPG
  IP Logged
Valiant
Senior Member
***




Posts: 89
Re: Mr Valiant's Half Imperial
Reply #8 - 11/24/07 at 09:59:51
 
STOP PRESS: I just want to make it totally clear that my half Imperial is
in no way comparable to the full Imperial. Playing some tunes through
the 1/2 Imp which sound great, in no way compare with the IMPERIAL which
shook every item in my house, and the neighbours too.

The half Imperial as built with the 4, 8 inch woofers offers good extended
midrange and nice bass, but I'm not kidding myself, and don't you either.

Still, an exellent speaker none the less. More pics and details to follow...

Cheers

Gaz
Smiley
Back to top
 
 
  IP Logged
Gexter
Ex Member



Re: Mr Valiant's Half Imperial
Reply #9 - 11/24/07 at 20:09:17
 
Hey buddy!
I wonder if the FS was lower it would play lower. It would be interesting to try a single 12 with a Fs lower than 30.
John in C.R. did some sims with a half IMP as a sub it was looking favorable. A low Fs full range 12 always interested me in a half Imp.


Back to top
 
 
  IP Logged
Valiant
Senior Member
***




Posts: 89
Re: Mr Valiant's Half Imperial
Reply #10 - 11/25/07 at 00:39:52
 
Hiya Guy,
Guess what I have sitting in the shed? An old 12 inch sub that Jake passed
onto me a few years back. With the replaceable front panel, I'm going to
enjoy this Imperial to the max.  8-)

Gaz.
Back to top
 
 
  IP Logged
Valiant
Senior Member
***




Posts: 89
Re: Mr Valiant's Half Imperial
Reply #11 - 12/10/07 at 13:44:35
 
And for now, here is the finished product. Cheesy
Oh, I picked up a sheet of Jarrah veneer that is big enough to cut a
panel for the 4 x 8's and (this is what lights my candle), a front panel
for 1 full sized Imperial., plus a few lengths of 2x3 Jarrah for the back
braces. In other words, the full sized Imperials are a goer, though it maybe
sometime before I start cutting wood.

I'm considering the following, a 15inch woofer, sandwiched by 4, 8 or 10 inch
drivers. Hmmm Wink Like I said in an earlier post, I'll check out various drivers
in the half Imperial and see what delivers.

"Dank's" article 'Interesting twist for an Imperial' gives us some idea
as to what can be achieved (definately worth another read). The Decware Imperial
concept of using mismatched 15" drivers in the cabinet may find its nirvana in the
not only mismatched, but mis-sized driver scenario.

Of course, the immeadiate queary from wife and friends is...'where are you
going to put them?' Ahhh, leave the fine print till later huh. You guys know what I mean.      
Back to top
 

DCP_0002_001.JPG
  IP Logged
Valiant
Senior Member
***




Posts: 89
Re: Mr Valiant's Half Imperial
Reply #12 - 12/10/07 at 13:55:42
 
One more pic, just because I think it is cool. The array speaker on the
left is my own design, 6 x 5" drivers and 4 x 1" Vifa tweeters. The stereo
set up is as you see, with one of my arrays doing the right channel, with the balance
slightly favouring the right. The Half Imperial and array are hooked up via a
2 way active crossover (~3500Htz), the array woofers are not hooked up, the tweeters
supplying the +3500Htz signal. Sounds okay. The little array holds it's own on the
right.

Cheers,

Gaz.
Back to top
 

DCP_0005.JPG
  IP Logged
Valiant
Senior Member
***




Posts: 89
Re: Mr Valiant's Half Imperial
Reply #13 - 12/18/07 at 13:14:36
 
Oh okay, here is one more pic of my woofer.
Actually it is my daughter's woofer which I seem
to have adopted. Not a bad lookin dog for a
chihuahau, at least that is what my daughter
was told when her boyfriend bought him.
Back to top
 

Griffin_the_Woofer.JPG
  IP Logged
60_and_up
Seasoned Member
****


kids should live.

Posts: 933
Re: Mr Valiant's Half Imperial
Reply #14 - 12/19/07 at 02:43:15
 
looks fun Cheesy

Back to top
 
 

Peace hath higher tests of manhood than battle ever knew. ...
  IP Logged
Pages: 1 2 3 
Send Topic Print