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PostPosted: Sun Jan 01, 2017 5:08 pm 
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Joined: Sat Feb 20, 2016 11:39 am
Posts: 1
Location: Port orchard, WA, US
I was curious if anyone could provide any information regarding Yamaha JA4281B, JJA6681B and JA3882 components?
Thanks.
Happy New Year to all!


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PostPosted: Fri Jan 06, 2017 10:01 am 
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Joined: Fri Feb 12, 2016 12:15 pm
Posts: 8
Location: Marietta, GA, US
Very good stuff. They are, respectively, basically the Yamaha versions of the JBL 075 ring-radiator tweeter, the JBL 2420 horn driver, and the JBL 2220 15".

That said, the tweeter is significantly better in response than the JBL, in the top octave- it's flat out to around 18KHz or so. OTOH, it doesn't go as low as the JBL 075/2402- it's only rated down to 6KHz (where it starts to roll of rapidly). It's really, despite the construction, much more functionally similar to the JBL 077/2405 slot tweeter, both in usable frequency range and response. Due to the "bullet" construction of the phase plug, it will have narrower dispersion than the 077/2405- the dispersion will be more like the 075/2402 (narrow "cone" of output).

The mid compression driver has an Alnico magnet- I'd expect it to perform very much like a JBL 2420 or 2421. It's got pretty darn good response for a vintage compression driver.

The woofer should use enclosures similar to a JBL 2220 or LE15 (4 or so cubic feet vented tuned to about 40-45Hz). It also should be very well suited for a bass horn. In a vented box, it's not going to go very low (maybe 50-60Hz or so rolloff), but it will be very efficient.

Regards,
Gordon.


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