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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:
Hi HollandThese are slightly different drivers
The 9458 were made in the late 40's (47-48 from memory) the 9584 from the early 50's to the 70's.The 9458 usually has a pepper pot type phase plug - just a dome with holes . The early 9584's (marked "A") started with the same phase plug but changed to a concentric slit phase plug pretty early in production.
If the phase plugs are the same they will sound pretty much identical and you can use them as a pair. The concentric slit phase plug has more extended highs and slightly smoother midrange - I have not tried it but I suspect different phase plugs will change the pairing - all you can do is try :0) .
Lovely drivers either way but the 9548 with the slit phase plug are a little bit better.
Email me offline if you want any more info.I am pretty sure Jonathan Weiss or Steve Schell will weigh into the discussion with much more knowledge than I as soon as they spot the thread.
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Follow Ups
- Re: RCA Compression Drivers - SLM 15:11:12 01/30/07 (5)
- Re: RCA Compression Drivers - jweiss 18:00:00 01/30/07 (4)
- Re: RCA Compression Drivers - holland 06:51:45 01/31/07 (3)
- Re: RCA Compression Drivers - SLM 17:35:38 01/31/07 (2)
- Re: RCA Compression Drivers - djk 18:39:50 01/31/07 (1)
- Re: RCA Compression Drivers - holland 12:16:23 02/01/07 (0)
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