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In the Forum: Horn-Loaded Speakers
In the Thread: Vitavox’s S2 Survival Guide.
Post Subject: Re: Midbass ..............( longish )Posted by slowmotion on: 4/15/2005
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The WE 555 is IMHO an interesting driver, made for a very spesific use,
which is driving a "full-range" horn in the theatre.
As we all know, the wide range system with Jensen 18"woofers and Bostwick tweeter came later, at first the 555 and the 15A horn ( the 555 was mated with a number of other horns, too, of course ) was used alone, as a one way system.
Because of this the 555 was designed to cover as wide a frequency range as possible, and a quoted frequency range from 60-100 to 5000Hz in actual use was not bad, I think. I have never seen one , but the several patents and pictures of this driver are an interesting read. The diaphragm and phaseplug
of this driver is very different from the way most later compression drivers evolved, the WE 594 and so on are all very different.
Of course I haven't a clue about how such a driver might sound .......
Comparing the 555 and the RCA drivers on the same horn is probably very interesting, but since the drivers are so different from each other, one of them
is bound to work "better" on any given horn than the other. Since the RCA drivers are of a more modern design than the 555 they probably work better
on "modern" horns than the 555. That is, horns designed to be operated in a narrower frequency range in multiway systems.
Is there any good features in the design of the 555 that we can use today?
Or is it hopelessly old fashioned and out of date?
I am of course thinking about the dreaded upper bass/ lower midrange frequencies. To make a direct copy of the 555 is IMHO of no use to us,
but some of the design features is interesting, and -might- be of use if one were
to design a compression driver to cover from say 60 to 275 Hz in the home.
cheers,
Jan
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