GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Horn-Loaded Speakers
In the Thread: Adding one more spherical to Macondo.

Post Subject: Revisiting the fundamentalsPosted by jessie.dazzle on: 9/28/2010

Romy wrote:

"...Since in my new house I will have no room height limitation I am consenting to replace my 250Hz tractrix horns with 200Hz exponential horns..."

"...I would like my Fundamental Channel to employ 170-180 Hz slow-opening horn and to use a driver with 350-400Hz crossover point. Sine I do not have too much height between tweeter and Injection channel I think to go for a wide horn, since it will not go higher then 1000Hz then I presume it will not impact imaging..."

When you get those cat paws on a 170-180Hz horn, you'll likely try listening to it while letting it cover more than just 600Hz of bandwidth (letting it run up higher than 1000Hz)... There is a possibility that one day you'll decide this is in fact the way you want to use it, in which case you might wish you had gone with a round horn.

You do have the space for it, but it would require that you move the Injection Channel up; since it is running at -12dB, this should not upset the perceived height of the image.

The new, larger round horn could be mounted not under, but on top of the arm currently supporting the 250Hz horn. Running a physically high-mounted 170-180Hz channel up into lower mid-range, one would logically be concerned about upsetting the perceived height of the image; In my experience (I use this configuration), the image does not so much move up, but rather increases in scale and opens up. This, to me is more like what I hear in a concert hall or theater; such a configuration does require a minimum 12-foot listening distance, which appears possible in your case. You could get some idea of the effect by running your high-mounted Injection Channel at -0dB.

To avoid vignetting caused by the new 170-180Hz horn, the Injection Channel enclosure could be inverted so that the driver is at the top.

You'd likely also have to increase the footprint of the chassis to insure stability (extend the base plates by bolting on square section metal tubes).

jd*

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