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Tweeter materals

post #1 of 11
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Is it just me or do I hear the highs sound more bright when the tweeters are using titanium coated polycarbonate dome tweeters or titanium-laminated dome tweeters vs normal Polycarbonated dome tweeters. I just wonder why did titanium-lamiated dome tweeters sounded more like cymbles crashing compaired to polycarbonate tweeters.



Btw both titanium-laminated dome tweeters and titanium coated polycarbonate dome tweeters are same just worded differently.


When I compair the JBL Control 1 and the JBL Control 1Xtreme lows and mids sound the same but I remember the highs were more bright on the Control 1Xtreme since it used titanium-laminate dome tweeters instead of polycarbonate dome tweeters.



I wonder if there are others who has owned speakers that uses Polycarbonate dome tweeters and has compaired them to Titanium-Laminate dome tweeters. I wanted to know if others think that Titanium-Laminate dome tweeters sound brighter than Polycarbonate dome tweeters. I think Myler dome tweeters sound the same as Polycarbonate dome tweeters since both are plastic type tweeters.
    
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post #2 of 11
I just wondering if anyone here knows the difference on sound compaired two meterals.
post #3 of 11
Could be a variety of issues. Unless we know what the spectral decay plots look like on either tweeter, it's more or less just speculation. Maybe the titanium tweeter is suffering from some breakup modes near the edge of the crossover boundary.
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post #4 of 11
Well all I know is that both tweeters are designed and made the same way but just one uses a thin film of titanium coating on a polycarbonate dome tweeter. But is it normal that titanium-laminated dome tweeters sound brighter than myler or polycarbonated dome tweeters if both were designed the same way?
post #5 of 11
Titanium is more rigid than cloth and has many properties that can make it a more ideal transducer material (if you cross it over properly to avoid the resonances at the lower end of the tweeter response). Metals are harder to work and typically require more expensive crossovers though, due to the significant levels of resonance they exhibit at certain frequencies, which is often a reason people have described them as having a sound bright sound--ringing at the crossover boundary thanks to cheap crossovers, as you need a very steep brick wall filter to deal with these resonances. This is one of the main reasons metal drivers are fairly rare and poly woofers and cloth tweeters are widely available.

Now is this the cause in this particular case? Maybe yes, maybe no. I haven't seen any measurements done on laminates though, only pure metal or cloth.
Edited by astrallite - 6/20/11 at 2:42pm
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post #6 of 11
So does that mean that titanium tweeters are overall better tweeters than others like silk or poly etc?
post #7 of 11
It can be better if you use the proper components around it but if you are asking about commercial loudspeakers in the under $1,000 range I would say it's far easier to get better performing soft-dome than a metal one.

A typical aluminum/titanium tweeter has it's breakup mode around 1.5KHz which is extremely close to the crossover frequency in a typical 2-way. If you want to design a higher crossover frequency this means your woofer is handling much higher frequencies, and this effects the off-axis response of the woofer, causing increased beaming.

I don't think it's easy making a "fault-less" 2-way with a metal tweeter because of the hefty investment you would need to make for a woofer that can cover up the tweeter's breakup mode. Realistically you either need to go 3-way or just give up and use a soft dome.

NHT Classic 3 is a good example of taking advantage of metal drivers properly; hiding the breakup modes of each driver by crossing them all over before their breakup modes. Going 3-way fixes the problem of woofer beaming that usually accompanies high crossover frequencies.

To sum it up, a metal driver CAN be better, but only if you make the proper investment because it's high performance band is pretty narrow compared to a soft dome. Getting mid-fi speakers is not going to cut it. The NHT Classic 3s are one of the few exceptions I can find under $1,000 that do metal properly. You really need to go to $2k or more before you find any real effective designs using metal drivers.
Edited by astrallite - 6/23/11 at 11:40pm
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post #8 of 11
So probley the Control 1Xtreme isn't that great sounding on the highs since it has some titanium over polycarbonate. But Are you talking about pure titanium vs silk dome tweeters? Since the Control 1Xtreme uses not 100% titanium. It's like 75% titanium and 25% polycarbonate I remember reading that on some specs for all titanium-laminate dome tweeters for JBL speakers.

But if it's still the same since titanium-laminate tweeters have some metail then I guess the Control 1 has a better tweeter since it only uses polycarbonate dome tweeters.


Btw thank you for helping me on this I do appreciate it.
post #9 of 11
Without knowing more about the drivers or having some FR plots/decay measurements it's just idle speculation. And these speakers are too cheap to be of consequence to warrant that kind of effort; really just buy the one you prefer.

Edit: Found a review

http://www.hometheater.com/content/j...-labs-measures



Looks like a poor performing speaker in general. I don't think the material was a determining factor in this case other than the fact that it was a cheap tweeter built to meet a very loose performance goal.
Edited by astrallite - 6/25/11 at 1:10am
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post #10 of 11
Well the Control 1Xtreme was suppose to be like the original Control 1 speakers so they should be good as the original Control 1 in sound. But maybe the original Control 1 speakers are better overall in sound.
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