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-   -   3"or 4" driver with very good dispersion and high xmax? (http://www.diyaudio.com/forums/full-range/220084-3-4-driver-very-good-dispersion-high-xmax.html)

markus76 20th September 2012 07:54 PM

3"or 4" driver with very good dispersion and high xmax?
 
Hi guys,

I'm not familiar with the marketplace for 3"/4" fullrange drivers. Looking for a driver with very good dispersion and high xmax. Are the Tang Band W3-1878 and W4-1879 worth their money? Any other recommendations?

Scottmoose 20th September 2012 09:35 PM

I don't know. It depends what your idea of value is. The Mark Audio range have good (by wideband driver standards) off axis performance in part due to having a relatively flat cone profile. I can't think of any other 3in - 4in widebanders offhand with a long Xmax that fit that criteria.

Of course, this does tend to bring us back to a fundamental point: what is Xmax? There is no industry standard definition. Some use 10% THD. Others use 0.5 x absolute value of the height of the magnetic gap - height of VC winding. Others simply take it as a physical measurement of the VC gap and winding height. All will give different values for the same driver. And none of the manufacturers generally states which method they use. 99.99% of the time, it will either be whatever was easiest for them to do, or whatever looks best on a data sheet, assuming they care. So what does it mean? Not much. Take the first example. A driver could be at 9.9999999% distortion and still nominally be within Xmax. Cracking. That's going to sound a heck of a lot better than 10.0000001% distortion isn't it? Or take the other two examples. No actual distortion value is attached to either -it could be almost anything. So much for the notion of linear operation. It's at best a very general guide, and frankly, not a very good one at the present time.

Hmm. My first rant of the day, and it's 2235 local time. I'm slipping. Remind me to see my doctor.

chrisb 20th September 2012 10:22 PM

Quote:

Originally Posted by Scottmoose (Post 3172634)
. Remind me to see my doctor.



Who?

Bill poster 20th September 2012 10:33 PM

The small Aurasounds are the kings of xmax, but sound wise perhaps the good value Omnes 3.01 (3") might fit the bill, its a great sounding small driver that seems to handle a bit of punishment.

cotdt 20th September 2012 10:48 PM

The new Tangbangs are the way to go!

chrisb 21st September 2012 06:12 AM

Quote:

Originally Posted by cotdt (Post 3172710)
The new Tangbangs are the way to go!

which ones exactly?

Scottmoose 21st September 2012 02:53 PM

Quote:

Originally Posted by chrisb (Post 3172683)
Who?

If he's got the new girl with him (just been given her first airing, although not officially as the Doctor's companion just yet -that's apparently in the Christmas Special), then very definitely 'yes.' ;)

Scottmoose 21st September 2012 02:55 PM

Quote:

Originally Posted by cotdt (Post 3172710)
The new Tangbangs are the way to go!

I don't doubt they're good units, but which ones, why do you like them, and any off-axis measures? Some extra detail would be useful.

cotdt 21st September 2012 03:04 PM

The Tangbang 4" with the flat sandwich aluminum cone. It's got 15x more xmax than a Fostex.

markus76 21st September 2012 03:05 PM

Quote:

Originally Posted by cotdt (Post 3173493)
The Tangbang 4" with the flat sandwich aluminum cone. It's got 15x more xmax than a Fostex.

Doesn't seem to be available anymore? Do you have the type number?


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