Any info on AKAI orthodynamic tweeter

[oshifis]

I just bought a pair of AKAI orthydynamic tweeters out of curiousity. The type number is 4IT-SM3G, and 8 ohms is maked on them. Diameter 40 mm, height 11 mm. It seems they have a ferrite disc magnet at the back (no holes) and another at the front (with 8 holes). The spiral on the aluminium (or plastic with aluminium layer) diaphragm is visible throgh the holes. There is a fine wire mesh at the front. I suppose they should be better than dome tweeters. Has anybody got any information on this speaker? Which AKAI loudspeaker box are they used?

[OzMikeH]

sounds like a planar-magnetic design, Also called regular phase by foster. Relatively common in headphones as well.

Sorry I can't help you with Akai specific stuff.

[oshifis]

Yes, I have two (and a half ) planar orthodynamic headphones. One of them, the Peerless has a very similar driver, except both the front and rear magnets are perforated.

[Damosan]

These sound like the ribbon tweeters sold by Apex Jr and others. Originally from Technics (or so I believe)

http://www.t-linespeakers.org/drivers/ribbon.html

Apparently very good.

[planet10]

Yes, these Akai are the same as the ApexJr ribbon (i assume from the description they are the same as the ones in a small set of Akais that i have -- quite a neat speaker, 4" midwoofer + a PR on the back)

dave

[oshifis]

They are the same as I hold in my hands, indeed! Thanks guys, good catch.