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In the Forum: Horn-Loaded Speakers
In the Thread: Chinese upperbass horn.
Post Subject: better shot showing the rear chamber...Posted by Jeffrey Jackson on: 8/17/2005

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Hey Romy...

you could be right about the ALE's.. I certainly did like them, but when I went back to that familiar recording it was definitely shelved down low.. it would be easy to assume that I thought that they were "lightweight" because I had never heard bass devoid of heavy second harmionics before, but I have built several basshorns over the years and even have a LABsub style horn in another room.. so I am familiar with "clean".. who knows.. we'll find out when Rich sends me a big compression driver and we start building horns.. I wonder where the happy medium is? the magic spot where mouth size, flare rate, and path length converge... 

anyway.. here's a rear shot.. 

ok..just cruised my harddrive.. no shots of rear.. hmm... I'll take one and post it.. I definitely had to seal the rear.. huge difference.. in this case, nearly 100% positive..  I know that this is not always the case, however.. I have heard open back compression drivers on midhorns that sounded much better than sealed...  I think that open back drivers require more horn loading to keep the lower range as "full" sounding.. just my experience so far... 

and Romy, if you ever have to come to Memphis, stop by.. but I wouldn't suggest August.. steambath around here.. 

oh, and you asked why I propped them up on legs - well, because a horn of this length is quite directional.. I chose lower midrange/upper bass purity over a few hertz.. it was no contest.. I never measured before and after.. it would have been interesting to know.. I have been saying for some time that I am going to seal them not only to the floor, but to each other.. but I haven't done so yet... I did finally add all-thread rod for extensive and very stiff cross bracing.. highly recommended..

but you still have to listen and position.. just like the old days of cones and domes.. 

Best,
Jeffrey 

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