Andrew Jones’s new speaker brand - Jones and Cerreta

[mhardy6647]

The hazard of beryllium is mostly with the workers working on beryllium parts. The primary hazard from beryllium is exposure through breathing in dust (e.g. from metal working, such as grinding, polishing, etc.), fumes (e.g. welding), mist (agitating solutions containing dissolved beryllium), and skin contact with soluble salts containing beryllium.

The beryllium in your beryllium dome tweeter is not dangerous. Just don't take a sand paper to it and try polishing it, or stab yourself (or others) with it.

https://www.osha.gov/beryllium/rulemaking/faq

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I am always amused, and somewhat bemused, by people who freak out about, e.g., a little piece of beryllium or some oxidized cadmium on an old loudspeaker basket -- but don't think twice about, e.g., the lead-sulfuric acid batteries, sodium hydroxide oven cleaner, ammonia glass cleaner, or phosphoric acid "lime and scale removers" they have in their houses.

Risk vs. benefit remains poorly understood.

My canonical advice: don't lick it or chew on it.

 

[NTK]

I am always amused, and somewhat bemused, by people who freak out about, e.g., a little piece of beryllium or some oxidized cadmium on an old loudspeaker basket -- but don't think twice about, e.g., the lead-sulfuric acid batteries, sodium hydroxide oven cleaner, ammonia glass cleaner, or phosphoric acid "lime and scale removers" they have in their houses.

Risk vs. benefit remains poorly understood.

My canonical advice: don't lick it or chew on it.

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Or those occasional persons that mix chlorine bleach with Drano

 

[mhardy6647]

Or those occasional persons that mix chlorine bleach with Drano

Yeah, well...that's natural selection.
Slightly different topic.

PS Forgot about NaOH drain cleaners!

 

[PGansz]

I am always amused, and somewhat bemused, by people who freak out about, e.g., a little piece of beryllium or some oxidized cadmium on an old loudspeaker basket -- but don't think twice about, e.g., the lead-sulfuric acid batteries, sodium hydroxide oven cleaner, ammonia glass cleaner, or phosphoric acid "lime and scale removers" they have in their houses.

Risk vs. benefit remains poorly understood.

My canonical advice: don't lick it or chew on it.

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Weird that Na and K are on there, even though they're in my Wheaties!

 

[MGJ]

Oh my. This has gone from AJ's new speaker/company too can I lick my beryllium tweeter. LOL.

 

[mhardy6647]

Weird that Na and K are on there, even though they're in my Wheaties!

Not the free metals, I hope!
If so, you'll get a nice tang when they hit your saliva. Maybe even a little purplish flame, in the case of potassium.

 

[mhardy6647]

Oh my. This has gone from AJ's new speaker/company too can I lick my beryllium tweeter. LOL.

Yes, but that case is closed. Don't lick the tweeter.
Now, depending on the finish on the cabinet... licking may be ok or ill-advised... someone should start another thread.

 

[Audionaut]

I am always amused, and somewhat bemused, by people who freak out about, e.g., a little piece of beryllium

If you want, you can post this in the humor thread and make fun of it. I’m well aware of the dangers of beryllium and also that, as a rule, there’s no exposure with a dome tweeter. The risk is therefore not automatically high in everyday situations, but it’s not zero either. If, for example, as happened to an acquaintance, your own toddler wants to get up close to the speakers, it doesn’t just end with a dented diaphragm or dome—instead, mom and dad are sweating bullets while their child gets checked out at the hospital.
In any case, that’s why I don’t want to see any beryllium used as a diaphragm in my home.
Of course, you’re welcome to see it differently.

 

[Mart68]

The main purpose for using any exotic tweeter is marketing. Someone on another forum the other day was saying that they'd like to try ribbon tweeters.

Like you would say 'I'd like to try sushi' or 'I'd like to try base jumping.'

No doubt at some point they'll buy speakers that have ribbon tweeters, regardless of the merits of the speaker, and the marketing will have worked.

 

[tineared]

Oh my. This has gone from AJ's new speaker/company too can I lick my beryllium tweeter. LOL.

Half the fun of reading these threads is the tangents that arise...

 

[Pearljam5000]

Here you can hear the difference between beryllium and other materials
It's amazing how different they are

 

[mhardy6647]

Half the fun of reading these threads is the tangents that arise...

I mean... I agree, but there's clearly a bimodal distribution of ASR members/posters/readers in that regard.

 

[thewas]

Here you can hear the difference between beryllium and other materials
It's amazing how different they are

I had written about the sound of different tweeters here, including scientific research with listening tests:

https://www.audiosciencereview.com/...rbeth-30-2-vs-kef-r3.14450/page-2#post-445233

Different sound is only due to different FR (which can be equalised), resonances & distortion (which can be made low enough to be inaudible) and due to differences in radiation pattern, no magic behind.

 

[Timcognito]

2 Giant magnet structures with 10" cones, 15" equivalent, gap management for long excursion, 160 lb unit and you get down to only 34Hz?

 

[kharan]

The shape of the cone and the crossover frequency for the tweeter bode well, in any case I think this is a first for a dome tweeter inside a coaxial driver. Both Genelec and Kef cross higher. And the woofer crossover is also suitably low.

2 Giant magnet structures with 10" cones, 15" equivalent, gap management for long excursion, 160 lb unit and you get down to only 34Hz?

95dB/2.83V/1m

 

[KL....]

Oh my. This has gone from AJ's new speaker/company too can I lick my beryllium tweeter. LOL.

Thank you, @MGJ, hmm, there is no Measure from Jones/Cerreta to discuss, is there, although there is limited limited Marketing, Specs, and no Impressions. So, nothing to discuss other than peripheral characteristics, is there....

 

[levimax]

2 Giant magnet structures with 10" cones, 15" equivalent, gap management for long excursion, 160 lb unit and you get down to only 34Hz?

If you want the very high efficiency they are claiming you need to compromise on extension. For a 5 watt tube amps it is probably a very good compromise, for a 500 watt Purfi amp the compromise would probably be different with lower extension.

 

[levimax]

The main purpose for using any exotic tweeter is marketing.

AJ is banking on field coils being perceived as more exotic than Beryllium.

 

[Pearljam5000]

The main purpose for using any exotic tweeter is marketing. Someone on another forum the other day was saying that they'd like to try ribbon tweeters.

Like you would say 'I'd like to try sushi' or 'I'd like to try base jumping.'

No doubt at some point they'll buy speakers that have ribbon tweeters, regardless of the merits of the speaker, and the marketing will have worked.

Then why is Focal using Beryllium for years?

 

[Sal1950]

but I won’t have beryllium in my home because of its extreme toxicity, and just the sight of beryllium tweeters without grilles or other protection makes me shudder.

Your not supposed to EAT IT. LOL