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In the Forum: Horn-Loaded Speakers
In the Thread: Midbass Horns and Real Estate.
Post Subject: Midbass options to consider.Posted by Romy the Cat on: 7/27/2009
Yes, it is certain in what I proposed there is majored disadvantage of having a suspended floor. A suspended is like a bad turntable – no matter what you do you would never be able to get proper lower octave. The idea to have horn firing from roof is fine but in most of jurisdictions I think it will be prohibitive to build such a thing above roof. I need to check about it. To hide he horn in the living space is impossible of courses but in case of basement it does not take any useful space, which is not the case of ceiling firing horn.
A good idea might be using a “J” horn from both side wall, were the long horn tail runs parallel to the wall. The bitch in all of it I see that there is absolutely no way to predict what you are getting into until the things is build. Even if the things is built then you might recognize that that peaks of the response upon which you would like to capitalize might be located not in the location of your targeted listening spot and all you desires with proper time-alignment might go to a toilet. So, it is opposable to make the thing “movable”? I do not think so. I think the most sensible to have the horns build as is and then very accurately to play with equalization to get the sound that you feel it right.
Profile is another bitch. Obviously with 40-50Hz horn no one would go for a fast profile (who can afford it?) and the exponential or hyperbolic are the profiles to use. You have more extension with hyperbolic that everyone feel is “better bass”. I do not know about it. Hyperbolic is slightly longer and has much slower opening at the beginning of the horn. That slower expansion creates more horn gain and better bass. However, I have a theory, pure invention of my mind and proved by nothing, that more gain and better bass hyperbolic has because it has too much near parallel walls in the beginning of the horn and therefore the horn pick some standing waves, that eventually got amplified by horn. The theorist would say that I am fool and show to me the perfect acoustic impedance curves of hyperbolic profile but I am not convinced. A good hyperbolic extend response beyond the mouth rate – isn’t it the even that something is “wrong” from a position of purist-jerk position? I do not have anybody who would be able to elaborate of sonic consequences of that theory of mine…
Returning back to real estate – it might be made coupled or decoupled. In coupled application the hose are permanently installed in a building, via roof, floor, or wall-loaded. In decoupled configuration the hoe are like Jessie horn are independent and might be moved. With all positive intentions there are a LOT of advantages to have decoupled horns. Frankly I sometimes think about wall loaded horns or even about folder horns with my midbass horn might not go over 150-180Hz. If I knew that my midbass will need to stop at let say 100hz then I might try something like Edgar’s Refrigerator horns with my driver and with some optimizations for proper operation. In fact I was told that there is guy in NY who has a pair of Edgar’s Refrigerators and I might try to audition them. The problem with Edgar’s Refrigerators and similar attempts is that people who use them treat them and the open-bottom channel and to get from the Refrigerators as much bass as possible, pretty much fucking up everything. The Refrigerators are 45Hz horns with mouth of probably 55Hz – so it shall not be pushed lower. In fact the driver probably need high passed do not even except lower signal. I wonder if to optimize the Edgar’s Refrigerators for better drivers, much smaller throat and do not push it below let say 45hz then would it possible to get out of them VERY good sound? Do not forget that in my satiation my midbass horn is not the lowest channel in my playback. The advantages are huge – portability and small space but there are also problems. The biggest problem is that I have no idea how much HF I would need from my midbass. If my upperbass horn will be able to pressurize the room then it is OK but most likely I would need help from midbass. The key in here it to have midbass and upperbass to work together in 100-300hz region where upperbass set the reference of “direction” where bass come from but the midbass set the reference of “softness”. With a straight horn and a proper driver (and I have very cool one) there is no problem to run the midbass to 300Hz or even to 500Hz. With folded horn with each Hz above the hoer sound worse and worse … Unfortunately you would never know what you need until you install the thing and try it…
At this point all my thinking is very non-specific. I think if I get a new pace it will take for me a year unit I get the sound that I am getting now and will finalize what kind midbass solution I would like to implement. I would like the real estate to be accommodateable but I also realized that there are so many variables that it hard to predict anything. With MF horn or even with upperbass horns is simple, with midbass horns it is truly “terra incognita” in terms of forecast how it will sound.
Brits did it right and radical. In south-east London, in there is an artillery museum and Brits made it interesting. I think the left channel tratrix horn is coming from underground… :-)
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