GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Horn-Loaded Speakers
In the Thread: 45Hz Bass Horn

Post Subject: Re: "something else"…..Posted by jessie.dazzle on: 9/23/2006

Thanks for the recommendations on crossover points and the image of the rear chamber on your Upper Bass horn...

I've been back into some virtual modeling of this large horn (having made one quite nice MF horn, I've proven to myself that I have not forgotten how to work with the materials involved, and am now permitting myself to go back into the virtual world a bit)... Today I built a reasonably accurate CAD model of the AK151, and then around it, I constructed a rear chamber having a volume tuned to 80Hz. And... Interesting coinsidence... It turns out that the smallest cylindrical volume which will contain an AK151 works out such that the chamber is tuned for 45Hz, which matches the Fs of the driver. Raising the tuned frequency as you suggested, can be achieved by introducing a solid to this volume... Probably in a ring-shape in the area around the magnet.

I should not have to push the 45Hz horn too low, as I will cover the really low notes via a pair of subs based on the McCauley 6174 (which I will add once everything else is dialed in).

As for clearly visualizing the result... I have no trouble at all seeing it.... Hearing it ahead of time, well now... not so sure what I imagine is what I will get, but as a matter of fact, I do have an imagined and internally audible result. Also, this may sound silly, but I could already hear something I really liked in the driver without the horn... some sort of texture to the sound that I can only associate with the tone of my parent's C. 1960 tube driven console-type stereo... the big cabinets everyone used to have back in the day.

Regarding leading musical interests and understanding... I am evolving this all the time... which is somewhat facilitated by living here.

Next step is to finalize the way this horn will be assembled (has to be done it parts, which have to fit in the elevator).

Thanks again,

jd*

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