What are the differences (sound and technical) between a 077 ring-radiator type tweeter and a more conventional horn-loaded tweeter? (Which, I take, many of you prefer)?
What are the differences (sound and technical) between a 077 ring-radiator type tweeter and a more conventional horn-loaded tweeter? (Which, I take, many of you prefer)?
The 077 (or 2405) is considered an ultra-high-frequency driver. They are used to extend the range of the system which may also contain a horn/compression-driver/lens combination high-frequency driver. The UHF driver is crossed around 10kHz in 4-way systems, or around 6.5kHz in systems without horns like the L65 Jubal. The older ring-radiator 075 was frequently found crossed down to 2.5kHz range when used to augment the older full-range drivers such as the D130, but that wasn't really their comfort zone. For comparison, a "normal" JBL titanium dome tweeter is usually crossed around 4kHz in a three-way monitor or as low as 2.5kHz in a two-way.
The difference is the extra "sizzle".
". . . as you have no doubt noticed, no one told the 4345 that it can't work correctly so it does anyway."—Greg Timbers
The 077 has great horizontal dispersion which contributes to it's great state of the art sound. In my opion it's just the best horn tweeter, no matter what kind of a horn, other tweeters use.- RUDY
077 is a Ultra High Frequency driver. Often used from 8Khz and up.
What you describe as "conventional horn-loaded tweeter" is most likely a midrange driver (2440, 2241, 2245, 2246 etc) that requires a horn to properly load down to 500/800Hz, but those hardly go beyond 10KHz. As you can see, they are for a different frequency range.
It appears we don't actually know what you are asking... all above are true, or seem to be reasonable opinions. There are small traditional diaphragmed tweeters such as the TAD ET-703 and the newer JBL 045 Be/Ti tweeters. The TAD has a a 1.5" diameter diaphragm with an integrated horn. The JBLs have a 1" diaphragm and are basically miniature compression drivers that get bolted onto tiny horns.
The reason for the ring radiator design is that by "removing the center of the dome" it is free from a lot of the phase cancelation issues that typical compression drivers have and eliminates the need for a complex phase plug.
Widget
My Widget, your right.
I was not thinking, (doh) and mistaking the mids for a tweet. As soon as I saw your comment, I remembered seeing many pics of jbl's with a horn mid, and a tweeter also, like the 077.
did you buy them from that famous ebay seller?
Can't wait to read your measurement and comments compared to the et703!
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