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Old 26th September 2013, 03:00 AM   #1
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Default Roy Allison Model Three...

Hi,

I have an interesting situation where I need to put a speaker into a corner. Selling hifi, building it, and reading about it for years has always said this is the worst place to put a loudspeaker. Some digging revealed that the Allison Model 3 was designed for exactly this type of placement utilizing the boundary reinforcement to extend the bass while simultaneously smoothing the low frequency problems due to room interaction. Does anyone have any modern examples of speakers like this? Duke at Audio Kinesis has some models designed specifically for corner placement and there is of course the Klipsch classic.

Best,

Chris
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Old 26th September 2013, 04:34 AM   #2
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You have a few examples with more available options like better drivers and upgrade crossover components for each of the options:
six Pi corner horn (kit)
Pi Speaker Kits, six Pi kit
six Pi corner horn
Pi Speakers, six Pi speaker
seven Pi corner horn (kit)
Pi Speaker Kits, seven Pi kit
seven Pi corner horn
Pi Speakers, seven Pi speaker

Read here the reviews for six and seven Pi speakers/kits.
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Last edited by Inductor; 26th September 2013 at 04:39 AM. Reason: Pi reviews
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Old 26th September 2013, 05:14 AM   #3
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I've had a pair of Model four
My first speakers
They had the two tweeters placed at the extremes on the (about 45 ) baffles.
The woofer was placed on the top
Now I reckon a certain similarity with the model Three ...
I always placed them on their special stands - plastic modular stools
and not directly to the wall but well away, as the corners, too.
So- if they follow the same conjecture that led to make the mod. Three - reinforcement from the near boundaries, that should be applied also for the tweeter side only. as in the mod. Four, which I never placed near a corner, or, if I did, I was well aware that if only a speaker had to be placed in one corner...well, the situation changes- but this happens everyday with every source.
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Old 26th September 2013, 07:54 PM   #4
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I'm aware of the PI models. I'm looking for something low sensitivity so that it is smaller.
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Old 26th September 2013, 08:11 PM   #5
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Just to contribute a bit of theory, I think Roy Allison published two serious papers on this approach in the JAES if anyone wants to follow it up. Plenty of diagrams and graphs of F/response etc. It is going back over 20 yrs from memory.
Cheers, Jonathan
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Old 26th September 2013, 08:21 PM   #6
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Some of the papers are over 40 years old at this point. I believe the first was from 1970. classicspeakerpages has some reprints.
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Old 26th September 2013, 09:32 PM   #7
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Quote:
Originally Posted by chrismercurio View Post
I'm aware of the PI models. I'm looking for something low sensitivity so that it is smaller.
DIY, I presume to clone, in which case I've yet to see any posted, but simple enough to do.

GM
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Old 26th September 2013, 09:36 PM   #8
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Yes...or a commercial product. While the application is limited, there has to be a small market for something like this.
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