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Volkman of RCA

This is the famous Volkman theater horn developed by RCA to be found in Olson's "Acoustical Engineering" p 235.

It was used with an acoustic lens when made by Westrex.
It is also a maximum sensitivity horn study- another RCA project to be found on page 231 . It is almost 80% efficient.

By using a large throat, with a large radiating area, and a large rear chamber, it is possible to achieve a very high efficiency from 50Hz to 600Hz.
The shortish front horn was used as a pattern control device from 100Hz and up. It also increased the load on the front of the four woofers, yielding higher output than a big bass reflex. ( for example, an Altec A7 is around 105dB at 60Hz, due to the short horn and big rear chamber)
There are no horizontal time delay issues with this horn.
Later RCA employed a better version, a radial basshorn, wich with two woofers instead of four, would disperse to a higher cutoff.

I am sure Steve Schell, Master of all things RCA can correct me, and fill in the blanks!

Best Bill


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