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In describing Allison speakers I have heard the term uniform power response. See the picture below. Unfortunately as Letitroll98 indicated getting a pair in pristine shape is impossible given what the state of the art was in materials for loudspeakers back in the 80s.Someone should resurrect his design principles and make a few models.http://img11.hostingpics.net/pics/599524allison1.gif
While at Axpona try looking up Duke LeJeune's Audio Kinesis (not sure he or his speakers are there this year). One of the concepts he pushes is controlled directivity.Back in the 70's I learned to unlike B&O speakers for their dry, constipated, un-involving sound.
While at Axpona try looking up Duke LeJeune's Audio Kinesis (not sure he or his speakers are there this year). One of the concepts he pushes is controlled directivity (like the mighty JBL M2 mastering speakers). The idea is to minimize sonic energy that hits walls/ceiling/floor and reduce the associated smearing. Sort of the opposite of poly/omni directionals. Duke also believes in reducing thermal effects in drivers, so leans towards high efficiency professional drivers.
Only to try clarifying what Duke said (wouldn't dream of stepping on his toes) ...His speakers (front radiators) are designed to be turned 45 degrees into a rectangular room to minimize first reflections off front/side walls. Secondary speakers/drivers are designed to provide delayed ambience reinforcement (from Jim Romeyn's "Late Ceiling Splash" concept). The idea is to make the room seem bigger by generating a second source per channel that has at least a 10 millisecond delay (as the brain will separate that amount of delay from the original sound wave). These secondary speakers/drivers cover midrange/treble frequencies and are placed directly behind the main speakers/drivers to provide the extra distance (11 feet needed based on the speed of sound being 1100 feet per second) to create the 10 millisecond delay. Proper in-room bass is addressed using his "Swarm" of 4 subwoofers placed near the corners of the room.With Duke's help I've installed a super cheap version of "Late Ceiling Splash" using a $20 Parts Express tweeter with a protective capacitor in series that lay on the floor pointing up directly behind my floor standing single driver (8 inch, whizzerless) speakers. The tweeter is wired in parallel with the the single driver speakers. It works! It adds treble response/dispersion and a larger soundstage (allowing the speakers to be pulled farther apart without losing the center of the soundstage).
I owned Shahinian Diapasons for years and really enjoyed them. They were in my living room which had a vaulted ceiling and gave me a very spacious presentation. I wish I had them now just to see how they would do with my current amp and dac (McCormack DNA 1.0 and Antelope Gold) I enjoy my current front firing speakers (SP Tech Timepieces). Among other attributes, I like the detail that the SP Tech provides.
… ClairAudient 1+1 V2+ in my sound room. For those who are not familiar, these are dipoles. The two active three inch drivers face opposite baffles. A front and rear baffle. The two active drivers operate in phase. They also share a single loading chamber.
This design change added a tank circuit to eliminate a null at 540 hz.
I now know I will never return to any kind of poly or omni directionaliy.
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