Fostex D262 TS?

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#2
ShaneF said:
Would anyone happen to know the TS parameters of the Fostex D262 compression driver? I can't find them anywhere.
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For most tweeters and compression drivers there are no TS parameters available and it's easy to understand why: The parameters describes the behaviour around the fs. They are not used at the fs and do not benefit from any ported enclosure. There are beneficial modifications you can do to the back chamber but the parameters won't help you there.

What do you want to do with the parameters? If you really need them, you can always measure it yourself.
 
#3
I was hoping to find Re and Le, for example. Of course the resonant Fr and Xmax would help too. All that I've found is "800hz lowest recommended crossover point". 800hz seems pretty low for a 1 inch compression driver.


I ohm metered them and they measure at 5.6
 
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#4
ShaneF said:
I was hoping to find Re and Le, for example. Of course the resonant Fr and Xmax would help too. All that I've found is "800hz lowest recommended crossover point". 800hz seems pretty low for a 1 inch compression driver.
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It's not the driver exit that's important for that, it's the voice coil or the diaphragm size. There are more 1" compression drivers which got a 44 or 50mm VC which are able to handle the 800Hz. I got a 1" mid compression driver which can be crossed over at 500Hz (also 50mm VC).

The Xmax won't help you. You can't change it and the compression drivers and tweeters are practically all underhung constructions with excursions below 0,5mm.

ShaneF said:
I ohm metered them and they measure at 5.6
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Fostex often gave incorrect parameters, they said they'd have exactly 8 Ohm Re. Did you see these?

http://www.acr.ch/uploads/media/ACR_LAUTSPRECHERKATALOG_90ER_JAHRE.pdf
http://www.acr.ch/uploads/media/ACR_LAUTSPRECHERKATALOG_90ER_JAHRE.pdf

Not much more informations though, unfortunately.
 
#7
ShaneF said:
So, I figure 2nd order BW (12db per 8ve) would be suitable @ 800haz for this driver, then? I don't think 1st order (6db per 8ve) would be a good idea.
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6 dB is a no-go, don't even think about compression drivers and 1st order. Start with 12 or 18dB but the slope will look a lot different acoustically and the crossover can't be based on the Re or calculated either because the actual impedance is strongly dependent on the horn and will likely have several peaks. You have to measure for EQing passive or in the dsp anyway.
 
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