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Path: utzoo!linus!philabs!cmcl2!seismo!harvard!talcott!panda!teddy!rdp
From: rdp@teddy.UUCP
Newsgroups: net.audio
Subject: Re: RAW SPEAKERS
Message-ID: <1035@teddy.UUCP>
Date: Mon, 29-Jul-85 08:44:21 EDT
Article-I.D.: teddy.1035
Posted: Mon Jul 29 08:44:21 1985
Date-Received: Wed, 31-Jul-85 23:21:09 EDT
References: <3177@decwrl.UUCP> <975@teddy.UUCP> <914@druxo.UUCP> <294@ttrdc.UUCP> <512@bonnie.UUCP>
Reply-To: rdp@teddy.UUCP (Richard D. Pierce)
Organization: GenRad, Inc., Concord, Mass.
Lines: 34

In article <512@bonnie.UUCP> saf@bonnie.UUCP (Steve Falco) writes:
>I built a set of "SpeakerLab K's" using the plans available from
>SpeakerLab.  It is not a trivial project (about 50 hours cutting and
>gluing) but it isn't hard if you are careful.  I did most of the crazy
>compound angle cuts using a hand-held circular saw and an aluminum guide
>clamped to the wood (mahogany marine grade plywood).  I find this more
>accurate that a tablesaw or radial arm saw.  I did need a tablesaw to
>make the really small pieces that I couldn't safely set up and also for
>the few pieces with angles greater than 45 degrees.
>
WOW! You either have the best hand-held circular saw ion the universe
or the worst tablesaw or radial-arm saw possible!

>I agree with the previous article that the horns give a superb bass
>response but I'm not too sure I would want a straight horn in the bass.
>The problem is that it gets kind of long and you start getting a time
>delay between the bass and midrange.  The folded horn is shorter and (to
>me) the time skew is not noticeable.
>
>	Steve Falco

Sorry Steve, It doesn't make any difference wether the horn is folded or
straight, the propogation delay through the horn is still proportional
to the overall length. 10 feet is 10 feet, whether or not you are going
around corners. What you might be refering to is the fact that all the
bends cause more anomolies at higher frequencies that might mask what
is an already severe problem.

By the way, is anyone aware that the propogation velocity through the
horn is less than that in free air, making the time delay problem more
severe than you might at first think, and that it is also frequency
dependent?

Dick Pierce