Technical/Restorations
Talk about restoring older speakers and other technical/electronic information here.
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Recent Posts
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By Dave MacKay · Posted
I've been reading an old (1972) book (How To Build Speaker Enclosures by Badmaieff and Davis). A topic that I found to be of interest was how the area of the mouth of an exponential horn determines the lowest frequency that the horn can reproduce. I tried applying the logic to my vintage La Scalas, but the answers I get don't seem to be very satisfactory. I measured the area of the mouths of: a) the lens used with the K-77M tweeter (4" x 1.5") b) the K-400 horn used by the squawker (16.75" x 5.75") c) the La Scala bass bin (22.25" x 22") I then used those areas to figure out what the circumference of a circle with the same area would be (i.e., Radius=sqrt(Area/pi) and Circumference = 2pi*Radius). The thinking is that the lowest wavelength the horn can support should match the circumference, I came up with these figures for the lowest frequencies supported by the different horns: a) lens used with the K-77 tweeter ---> 1555 Hz b) the K-400 horn used by the squawker ---> 388 Hz c) the La Scala bass bin ---> 172 Hz I thought the the K-400 got its name because it was intended for use down to 400 Hz, so the figure for it (i.e., 388 Hz) seems reasonable. However, from what I've read on this forum, I thought that the La Scala bass bin was supposed to be good to about 104 Hz, which is well below the 172 Hz that I calculated. I'd be grateful if anyone would care to help me understand this better. -
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I’m looking for a grille for my RB5 II, only need o e but if you have two and don’t want to separate I will buy both. Thank you Brian Fogelman -
By KlipschLover368 · Posted
Thank you JRH, not sure why the pics didin't send but I will try again to attach. They re heavily compressed because 2MB isn't much... Third attempt maybe a zip file -
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By the real Duke Spinner · Posted
I made a Closet into a Sub Box. 🙂 -
Was going to ask if you want to post one's you heard here. I for one would enjoy hearing. Thanks! -
By Audioguy99 · Posted
It pains me to get rid of this subwoofer as I absolutely love it, but I live in an apartment now and it rarely gets used. This sub has major kick, and if used I would probably be evicted lol. I am now moving to a smaller apartment and cannot justify the space or the sound, so unfortunately will be letting this beast go. -
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