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Stereo Imperial (picture) (Read 17851 times)
buzz
Ex Member



Stereo Imperial (picture)
12/09/06 at 00:54:55
 
Stereo Imperial


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« Last Edit: 12/09/06 at 02:35:18 by buzz »  
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buzz
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Re: Stereo Imperial (picture)
Reply #1 - 12/09/06 at 02:49:10
 
Drivers are Audio Nirvana Super 10" fs36hz SPL96db XMax1mm Qts0.286

This sounds so fantastic I haven't been able to turn it off long enough to finish the 'wings'... something really special. I can't imagine any speaker being more emotionally engaging. Although its not true to the mono Imperial design I understand how this speaker fueled Steves' first interest in audio. If any one would like to know more just ask. And a special "Thank You" to Steve!
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« Last Edit: 12/13/06 at 21:07:01 by buzz »  
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gexter
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Re: Stereo Imperial (picture)
Reply #2 - 12/09/06 at 04:50:15
 
thats a pretty nice looking IMP.
who would have thought of using drivers on the side and reflecting the sound.

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buzz
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Re: Stereo Imperial (picture)
Reply #3 - 12/09/06 at 08:03:32
 
Steve gave me the idea one day when he mentioned that he had played around with using a cd to horizontally disperse the sound of an up-firing driver. I then tried all sorts of speaker arrangements using various 'reflectors' in the coming months. In my tests I was blown away to hear the 'hyper-stereo' imaging in this arrangement. If you want to hear the effect yourself, turn your drivers 90 degrees away from your listening spot and use LP covers as reflectors. The real magic happened when I bowed or curved the cardboard covers. The transformation was absolutely stunning...  from a beamy driver, with my head locked in a vise to get imaging, into speakers with a HUGE sweet-spot! Dispersion like the Gallo Reference 3.1 tweeter but FULL RANGE. And if you get that effect using a piece of cardboard, imagine how great a properly designed arrangement can sound.

Even my wife loves the speaker!


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« Last Edit: 12/09/06 at 08:25:04 by buzz »  
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paulc
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Re: Stereo Imperial (picture)
Reply #4 - 12/09/06 at 11:17:02
 
WOW!  It looks like an antique.  Good work!
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buzz
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Re: Stereo Imperial (picture)
Reply #5 - 12/09/06 at 14:16:15
 
Thank you! I was really only trying to make this beast look good enough to be in the house instead of in the garage. Here are a couple more detail shots... Maybe they can help someone increase the WAF of their own Imperial. (Everything was purchased at Lowes. Total cost was around $500 including drivers. Assembly and finishing took two days.)



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« Last Edit: 12/09/06 at 14:17:34 by buzz »  
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Chris K
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Re: Stereo Imperial (picture)
Reply #6 - 12/10/06 at 15:56:50
 
Hey Buzz,
That is a cool Idea you came up with there!!!! Grin
Is that Imperial scaled up or is your wife a very petite gal?
The original Imperial is 62" or 63" tall.
What did you do (if any) to modify the driver chamber size?
Did you extend the throat any? This can be done by running a board down the front behind the (what would normally be) the front baffle thus narrowing the throat a bit for better or more optimal loading at low bass frequencies. This information I read in the tech papers by Jensen engineers at the time of the design (1956?) Interested to hear what you did with these points of detail.
If it is as simple as doing a standard Imperial and putting the drivers and wings on you may well have revived the standalone console stereo!!!
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buzz
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Re: Stereo Imperial (picture)
Reply #7 - 12/10/06 at 18:41:51
 
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. P.S. My favorite quote from the Imperial build was when my petite wife said "These things are huge!" My response ?... "No honey they're not big, you just think that because of their dimensions."
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« Last Edit: 12/10/06 at 19:19:58 by buzz »  
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buzz
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Re: Stereo Imperial (picture)
Reply #8 - 12/10/06 at 18:53:49
 
I forgot to add that the 'wings' are on hinges. The reflected sound can be focused from a tight window with tons of detail (critical listening), to a room full of stereo sound with less detail (party time!).

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« Last Edit: 12/10/06 at 18:57:36 by buzz »  
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footstony
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Re: Stereo Imperial (picture)
Reply #9 - 12/13/06 at 02:51:59
 
Buzz that speaker is awsome!

really nice finish, I can't think of what to type I am so totally stunned by your original thinking.

Last night I was looking at the JBL paragon and this design has some similar ideas.
http://www.audioheritage.org/html/profiles/jbl/paragon.htm

Thanks for sharing.

Philip
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« Last Edit: 12/13/06 at 02:53:11 by footstony »  
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buzz
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Re: Stereo Imperial (picture)
Reply #10 - 12/13/06 at 11:13:30
 
Nothing is new under the sun. The JBL is proof. Speakers that use reflected sound probably have been around since the begining of audio. Thank you for the info. Now I may try to build that paragon! I wonder what drivers are availible for this application... Any Ideas? And what in the world is a "Ring Radiator Overtone Reproducer"? ???


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« Last Edit: 12/13/06 at 12:10:43 by buzz »  
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footstony
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Re: Stereo Imperial (picture)
Reply #11 - 12/13/06 at 22:44:58
 
Buzz,

I'm not really a JBL expert but I think it was a bullet tweeter. As used in the bel-aire
http://www.audioheritage.org/html/people/wolf/connection.htm

More info on the Paragon's indusrial design press the "next" button at the bottom of the page

Regards Philip
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dank
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Re: Stereo Imperial (picture)
Reply #12 - 12/22/06 at 13:31:51
 
Buzz

You are an experimenter.  Here is something you might want to try.  If your room responds the same way mine did, you will be shocked, stunned, and amazed.

Turn your Imperial around so the horn fires directly into the corner.  You will have to reverse your deflector "wings".

Also, if you haven't read Steve's paper "how to set up a room with no treatment", available under the "my room" tab on the Decware home page (www.decware.com), you might find that interesting as the second half of the paper basically talks about a setup that you would have if you have a single sub in the corner of a listening room with your mains positioned appropriately on either side of the sub.

If you try this, please let me (us) know what your results were.  My room sees a bass increase of 6db plus a wonderful feeling that the bass is enveloping you rather than just being played at you.

Dan
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buzz
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Re: Stereo Imperial (picture)
Reply #13 - 12/23/06 at 12:16:17
 
Thank you Dan for the tips. Give me some time to put my thoughts into writing on corner firing horns. Yes, a substantial rise in bass output... any trade offs? I haven't decided yet.

I also have a new project in the works. Plus, a Gallo Reference 3.0 vs. Jensen Imperial shootout I want to share my thoughts on...

All the best!
Buzz
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« Last Edit: 12/23/06 at 12:18:10 by buzz »  
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60ndown
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Re: Stereo Imperial (picture)
Reply #14 - 12/23/06 at 14:22:06
 
[quote author=buzz  link=1165629295/0#3 date=1165651412]Steve gave me the idea one day when he mentioned that he had played around with using a cd to horizontally disperse the sound of an up-firing driver. I then tried all sorts of speaker arrangements using various 'reflectors' in the coming months. In my tests I was blown away to hear the 'hyper-stereo' imaging in this arrangement. If you want to hear the effect yourself, turn your drivers 90 degrees away from your listening spot and use LP covers as reflectors. The real magic happened when I bowed or curved the cardboard covers. The transformation was absolutely stunning...  from a beamy driver, with my head locked in a vise to get imaging, into speakers with a HUGE sweet-spot! Dispersion like the Gallo Reference 3.1 tweeter but FULL RANGE. And if you get that effect using a piece of cardboard, imagine how great a properly designed arrangement can sound.

Even my wife loves the speaker!


[/quote]

whats going on in bottom left corner of this pic? there seems to be a piece of wall out in the middle of the room?

???
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« Last Edit: 12/23/06 at 14:23:09 by 60ndown »  
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