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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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In Reply to: RCA Compression Drivers posted by holland on January 30, 2007 at 13:10:27:
I can add a little to the very good answers you have already received. The 9000 series drivers began with the MI-9443 field coil unit in 1940, and was replaced by the 9448 permanent magnet model after the war. The 9458 came next (I've been thinking early to mid 1950s), then the 9548 in several versions extending into the 1970s AFAIK. The 9448 was deeper than the later drivers, which may indicate an earlier grade of alnico magnet requiring greater magnet volume for the same strength. Some of the diaphragms in these drivers had a flat compliance, though most used a half roll compliance. Like the early 1400 series field coil units, these fine drivers have been inexplicably undervalued and ignored by collectors and DIYers until fairly recently.The MI-9594 is a 60 degree radial horn, sister to the 9595 90 degree horn. Both were used extensively in the RCA radial horn systems, sometimes in combination from a common throat driven by the same driver or drivers. Often a 9595 would provide coverage for most of the auditorium while a 9594 on top would cover the balcony. As I think you will find, these drivers and horns sound very good. You will want to add a tweeter as the response falls off in the top octave. RCA only rated the response of the radial systems as extending to 8kHz.
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Follow Ups
- Re: RCA Compression Drivers - Steve Schell 02:07:42 01/31/07 (1)
- Re: RCA Compression Drivers - Dominic 00:04:10 02/03/07 (0)
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