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Stereo Imperial (picture) (Read 17810 times)
buzz
Ex Member



Re: Stereo Imperial (picture)
Reply #15 - 12/23/06 at 16:32:48
 
The time/date stamp of my camera was wrong, I decided to block if off to not confuse everyone... I guess I was unsuccessful.  :'(
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BIG_GEOFF
Ex Member



Re: Stereo Imperial (picture)
Reply #16 - 12/23/06 at 21:42:17
 
I think hes hiding something ???...
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Terry
Ex Member



Re: Stereo Imperial (picture)
Reply #17 - 12/24/06 at 07:49:31
 

Yes he is hiding his bottle of beer, but what brand.

TG Smiley
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buzz
Ex Member



Re: Stereo Imperial (picture)
Reply #18 - 12/24/06 at 11:57:46
 
You caught me, Only the BEST in my home...

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Jet-Lee
Ex Member



Re: Stereo Imperial (picture)
Reply #19 - 12/25/06 at 16:00:58
 
ewww

:spit: :spit: :spit:

The right stuff...


Back On Topic..

How much did those speakers set you back, if I can ask? Worth it, or can better be had for the money?
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serenechaos
Seasoned Member
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Posts: 199
Re: Stereo Imperial (picture)
Reply #20 - 02/05/07 at 02:25:27
 
[quote author=buzz  link=1165629295/0#7 date=1165776111]The only modification to Steves Imperial plans was to port the middle support of the chamber. In this way left and right channel cross talk is eliminated, however bass frequencies are summed. This also is a fantastic solution to in room bass node cancelation that all stereo two woofer systems have to deal with. The effect of  summing L&R channel low frequencies is a perceived increase in bass response, even-though actual response is flat everywhere in the room. This was a groundbreaking realization to me.   [/quote]
I'm not sure I understand what you did here.  
By "port  the middle support of the chamber"
do you just mean divide the chamber in two halves, sealing the drivers from each other?  

I think I want to try building one of these, about like you did, but starting with the corner version, instead of the rectangular version.  

Robert  :)  

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Dual turntable, modified Toshiba cd player
CSP pre, SE84CS-EX SET, Urei and 6C45 Spud amps
ML TLs, HDTs, OBs, Nagaoka Swans,Corner horns, subs
Dedicated room undergoing treatment
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buzz
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Posts: 393
Re: Stereo Imperial (picture)
Reply #21 - 02/05/07 at 07:16:21
 
The idea is to keep the compression chamber volume the same as called for in the original Imperial design. It is tuned for low frequencies because of its large volume. If you divide that chamber into two halves you will change tuning (bad for the design of this bass horn). However we need to separate the higher Left and Right channel stereo frequencies. How can we do that while still maintaining the full compression chamber volume? It can be accomplished buy cutting holes in that center 'divider', the important part is to cut holes that only allow the frequencies you need the chamber to resonate at to pass through. Here is a hint... just like any ported box or even any guitar, two smaller diameter ports can resonate at a lower frequency than one larger diameter port of the same length.
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« Last Edit: 02/05/07 at 07:32:43 by buzz »  
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serenechaos
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Posts: 199
Re: Stereo Imperial (picture)
Reply #22 - 02/06/07 at 01:01:44
 
???
So it's a secret, & you're not telling?
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Dual turntable, modified Toshiba cd player
CSP pre, SE84CS-EX SET, Urei and 6C45 Spud amps
ML TLs, HDTs, OBs, Nagaoka Swans,Corner horns, subs
Dedicated room undergoing treatment
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buzz
Seasoned Member
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Posts: 393
Re: Stereo Imperial (picture)
Reply #23 - 02/06/07 at 08:13:47
 
:-[
Try two 3" diameter 'ports'. It may or may not work depending upon the drivers you choose.
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serenechaos
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Posts: 199
Re: Stereo Imperial (picture)
Reply #24 - 02/06/07 at 17:52:15
 
[quote author=buzz  link=1165629295/15#23 date=1170749627]:-[
It may or may not work depending upon the drivers you choose.   [/quote]
I had in mind trying those Audio Nirvana Super 10" you said worked so well.  

If i couldn't get them to work, trying a JBL D130 in the center as a woofer, and "something else???" in the sides.  

Robert  :)
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Dual turntable, modified Toshiba cd player
CSP pre, SE84CS-EX SET, Urei and 6C45 Spud amps
ML TLs, HDTs, OBs, Nagaoka Swans,Corner horns, subs
Dedicated room undergoing treatment
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buzz
Seasoned Member
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Posts: 393
Re: Stereo Imperial (picture)
Reply #25 - 02/06/07 at 21:31:19
 
Oh,

you mean something like this?...



The top driver is the Decware 10" woofer, DHM108B. Four ten inchers, they rattle my brain.
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« Last Edit: 02/06/07 at 21:37:43 by buzz »  
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serenechaos
Seasoned Member
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Posts: 199
Re: Stereo Imperial (picture)
Reply #26 - 02/07/07 at 00:40:36
 
No, I meant the Audio Nirvana Super 10s in the sides, and the JBL 15 in front.  

Seperate compression chambers for each, opening into the throat, which becomes common.  

The 15 would be mono, the 10's stereo.  

Don't know if it would work at all.  ???  


Did the extra 10s help?  
More bass?  

What are you side "wings" made of?  
Wood?  Fabric?  (Reflective or absorbant)?  

Thanx again, Robert Smiley
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Dual turntable, modified Toshiba cd player
CSP pre, SE84CS-EX SET, Urei and 6C45 Spud amps
ML TLs, HDTs, OBs, Nagaoka Swans,Corner horns, subs
Dedicated room undergoing treatment
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buzz
Seasoned Member
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Posts: 393
Re: Stereo Imperial (picture)
Reply #27 - 02/07/07 at 00:48:42
 
If could do it over again I would not put in the second set of drivers. The Audio Nirvana drivers have such tight realistic bass it is amazing. I may end up trying a second set of AN in place of the Decware. I think the key is the small Xmax. For your 15" woofer keep the Xmax a short as possible, the Qts as low as possible. Fast tight bass is what makes the Imperial horn so engaging. But without a second set of drivers I felt that I was wasting SPL that the Imperial is capable of.

The 'reflectors' are 3/4" kerfed (so they bend) oak plywood. I also tried acrylic, lexan, glass, cardboard and foam. Oak was by far the best that I tried... but maple would probably be better.
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« Last Edit: 02/07/07 at 01:00:32 by buzz »  
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serenechaos
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Posts: 199
Re: Stereo Imperial (picture)
Reply #28 - 02/07/07 at 02:52:02
 
The D130s are 0.25 qts, 0.76 X-max, light paper cones.  
Should work well in horns.  

About how big are they; how much bow?
Have you played around with that much yet?  

Did you make the cabinets out of oak ply?  
What did you stain them with?
Sure do look nice!
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Dual turntable, modified Toshiba cd player
CSP pre, SE84CS-EX SET, Urei and 6C45 Spud amps
ML TLs, HDTs, OBs, Nagaoka Swans,Corner horns, subs
Dedicated room undergoing treatment
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buzz
Seasoned Member
****




Posts: 393
Re: Stereo Imperial (picture)
Reply #29 - 02/07/07 at 10:42:10
 
[quote author=serenechaos  link=1165629295/15#28 date=1170816722]The D130s are 0.25 qts, 0.76 X-max, light paper cones.  
Should work well in horns.  

About how big are they; how much bow?
Have you played around with that much yet?  

Did you make the cabinets out of oak ply?  
What did you stain them with?
Sure do look nice!   [/quote]

To me the Xmax of the D130 is still too high at 3/4". Remember total cone travel will be double the xmax (1.5 inches!) (OOPS .76mm! WOW!)

The Audio Nirvana only 2 millimeters. But your right, the D130 is a good driver, and will probably have tons of bass.

The kerfs in the plywood have not been glued yet. The reflectors can be flexed from flat to convex to a concave shape. This is easily done and you should decide for yourself what sounds best. They are sized to the dispersion pattern of your driver.

The cabinets are pine floor sheathing ~ $20 / sheet  (the same as what Steve used on the walls of his shop, and have suprisingly great sound http://www.decware.com/cgi-bin/yabb/YaBB.cgi?board=room;action=display;num=11698... ) But, I would use maple next time.

The finish is Minwax oil based one step gloss stain. 1st, Bombay Cherry and then Natural Cherry. A couple coats of each. Your house will stink for weeks.  ;)
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« Last Edit: 02/07/07 at 17:04:09 by buzz »  
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