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In the Forum: Horn-Loaded Speakers
In the Thread: Midbass impedance bumps -- why and what to do?
Post Subject: Some aspects are formingPosted by noviygera on: 8/30/2011
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Hello Romy, thanks for your guide.

I've been thinking and I feel that some basic upper bass channel ideas are forming; they a result of, as you say ,"organic" derivation from the rest of my acoustic system. I am pretty excited about this idea i have. The rest of my system is a midrange (10" driver)and high midrange (4" driver) horns and they are of the same design, just of a different scale. They start as round at the throat and morph to rectangular towards the mouth, with very interesting phase plugs that forms a compression chamber,  and a diffraction slot at same time:
FunktionOne resolution.JPG

Resolution 1.5.jpg

So my idea is to mimic the design of these in the upper bass channel but without the phase plug. So it will be a tractrix horn that starts round and ends rectangular at the mouth. I see two main advantages of this approach:
1. larger horn mouth area without blocking the midrange sound projection, in comparison to a circular mouth of the same area
2. similar design approach to rest of system -- organic extension of other channels
3. the resulting smaller mouth height will give me more freedom of choosing the depth of the horn and in turn I can select between different diameter drivers.

So this is the theory.

Other thoughts that are suspending this development are related to the driver selection. Precision Devices are the drivers (paper cone) used in the mid and high horns and so my natural attraction to try Precision Devices driver for upper bass. 12" or 15" maybe.  Is it reasonable to assume that a 15" can be crossed at 400Hz (2nd order crossover) and sound clean?
I am not sure about this so my 2nd choice is a 12" maybe even a 10" driver.
And one last thing for now I'd like to ask you. Would you know of a builder in the USA that can design the horn based on my requirements so that I do not attempt to be a horn designer?
I can get the design built locally.

Thank you,
Herman


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