Event Opal

[Ktacos]

Available in Europe, in Poland, used, in very good condition, for approx. USD 2,000

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I am no longer in a position to afford them lol.

 

[Sacha]

I owned them a long while back. Definitely impressive low end / dynamics / SLAM, especially for the size. I always found something weird / fatiguing / annoying about the top end though. Maybe the distortion? I don't miss them at all but I know some people loved them.

 

[RobS]

I owned them a long while back. Definitely impressive low end / dynamics / SLAM, especially for the size. I always found something weird / fatiguing / annoying about the top end though. Maybe the distortion? I don't miss them at all but I know some people loved them.

Which tweeter did your Opals have? Mine were the beryllium-copper ones and they definitely had some brightness. It's possible you find metal dome tweeters fatiguing.

Agreed on the slam, you wouldn't think so considering their size but they can hit like a truck if called for it.

 

[Doodski]

It's possible you find metal dome tweeters fatiguing.

A urban rumor. Metal tweeters mostly don't sound any more bright than a silk or whatever tweeter. If they do it's because they have been tuned that way and not because they are metal.

 

[RobS]

A urban rumor. Metal tweeters mostly don't sound any more bright than a silk or whatever tweeter. If they do it's because they have been tuned that way and not because they are metal.

Metal tweeters are prone to ringing and they can have IMD in the audible band due to severe breakup modes (which also have peaks in the FR). The most common criticism you find with metal tweeters is fatigue. I don't like them myself and prefer silk soft domes.

 

[Doodski]

Metal tweeters are prone to ringing and they can have IMD in the audible band due to severe breakup modes (which also have peaks in the FR). The most common criticism you find with metal tweeters is fatigue. I don't like them myself and prefer silk soft domes.

Strange because ENERGY/Audio Products International a older leading developer of the famous Reference 22 tweeter used silk in a double cone bullet configuration to eliminate what you describe as being problematic with metal dome tweeters.

 

[Ktacos]

Metal tweeters are prone to ringing and they can have IMD in the audible band due to severe breakup modes (which also have peaks in the FR). The most common criticism you find with metal tweeters is fatigue. I don't like them myself and prefer silk soft domes.

Most metal domes have break up outside of the audible range, so it's not a problem. Soft dome tweeters can exhibit break up well, and they tend to have it within the audible range.

It's only a common criticism because just have no idea what they're talking about and jump to what they think makes sense. Doodski is correct in that a tweeters brightness largely comes down to the filtering of the driver, not it's diaphragm material.

 

[RobS]

Most metal domes have break up outside of the audible range, so it's not a problem.

Yes however that IMD from beyond the audible band can fold in the audible band which can be measured.

Soft dome tweeters can exhibit break up well, and they tend to have it within the audible range.

Sure but the breakups are much better damped and controlled with the use of doping

It's only a common criticism because just have no idea what they're talking about and jump to what they think makes sense. Doodski is correct in that a tweeters brightness largely comes down to the filtering of the driver, not it's diaphragm material.

The IMD, resonances and ringing are all things I find intolerable about metal domes over longterm use.

 

[Ktacos]

Yes however that IMD from beyond the audible band can fold in the audible band which can be measured.

Gonna need some proof. Looking at some speakers Erin reviewed with tweeters I know have breakup outside of audible range, I'm not seeing any IMD issues associated with the break up.

 

[crappypanther]

I only know one thing: these are good studio monitors

 

[MarsianC#]

Metal tweeters are prone to ringing and they can have IMD in the audible band due to severe breakup modes (which also have peaks in the FR). The most common criticism you find with metal tweeters is fatigue. I don't like them myself and prefer silk soft domes.

https://www.thomann.de/at/prod_pdfreview_22948-mm46245_sr201011050.pdf

See for yourself. Directivity is opening up somewhat in the upper frequencies which could cause some problems with reflections.

I still love mine. Got the later Al/Mg tweeter.

I disassembled my Event Opal

Already posted in other forums, but after the post on the 8351B I thought you might enjoy my pics too. The Opals a quite similar, aluminum housing, heavy and good sounding. Measurments by S&R are very good too. I really like them ;) Absorbend material is usually around the tweeter, a big sack...

www.audiosciencereview.com

 

[Jim Taylor]

Yes however that IMD from beyond the audible band can fold in the audible band which can be measured.

Are you referring to subharmonics? If so, there is interesting information on them:

https://www.sciencedirect.com/science/article/abs/pii/S100757041500249X

Extract from the Yang/Sanjuan/Liu paper: "As far as we know, it has not been reported that this kind of resonance can be enhanced by another high-frequency excitation."