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In the Forum: Horn-Loaded Speakers
In the Thread: Problems with horns: upper bass
Post Subject: On Challenges and Suicidal TendenciesPosted by Dresden on: 11/13/2008
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I'm also concerned about the range, but I believe that in using an appropriate driver, I may be able to achieve a target range of 40Hz to 400Hz.

One reason for my wanting to achieve this range is precisely for the purpose of not wanting to have a 4-Way, 5-Way, or X-Way system reproducing indiscriminately selected frequencies.  Instead, I want to approach a maximum configuration of a 3-Way system (not counting a subwoofer should I decide to integrate one in the future).  Of course, achieving a range of 90Hz to 400Hz will also allow the same system configuration, albeit with the added cost of making a subwoofer a must.

In terms of a long horn acting as an acoustic low-pass filter, yes, I'm aware of that problem.  I've concluded that one way I may be able to control (or at the least, see the extent of the effect of this phenomenon) may be in creating two prototypes:  one with a 4" throat, the other with a 7" throat.  It's just a theory, but perhaps the throat dimension and resulting scale throughout the entire length of the horn may present a solution (less attenuation of upper bass in one of the two scales of the design).  Of course, it could just be a waste of time, rendering little difference, but it is just one factor I cannot be sure of until I've built and actually measured (and listened) to the working models.


 serenechaos wrote:
There's a big difference in 40 - 400 and 90 - 400 Hz. 

40 - 400 might also be stretching the bandwidth which will be horn loaded? 
(FLHs by nature are narrow band, 40 - 400 is over three octaves...)
And, besides the coloration Romy mentioned, a very long horn will act as an acoustic low-pass filter. 

Integration.  I mean all drivers having the "same type voice." 
I don't know what you plan below 40 or above 400, but they need to have the same general "Sound." 
Or you can end up with something that sounds like so many good drivers playing, instead of one integrated "Sound." 

Just a few of the problems I've been dealing with in building a 65 Hz mid bass horn. 
Which is MUCH smaller than 40 Hz. 
But is easy to integrate with a tapped horn from 25 Hz up to where it comes on.  
Something that would hit 40Hz does sound like an interesting challange... 
Robert  

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