Fostex FF165K enclosure

Ralph · 21st April 2004, 09:21 AM

I'm planning to use a Fostex FF165K as mid/high driver together with a Fostex tweeter and Beyma woofer. Active x-over between de Beyma and the FF165K will be around 200hz I think.

The Fostex has a x-max of a whopping 0.3mm so excursion limitation is key. I'm looking for suggestions of a enclosure for the driver, pref closed. 4.2 liters seems nice but excursion is larger than at 12 liters. Anyone suggestions?

Ralph

sreten · 21st April 2004, 10:47 AM

I've modelled the driver and the cone excursion is much
less for 4.2L than it is for the 12L enclosure below 100Hz.

However these excursions levels are ridiculous and are
only relevant after excursion reduction by the crossover.

I'd use 6L to allow for some series resistance in the crossover.

I'll also point out excursion limited power handling and max
SPL (112dB) indicates a crossover frequency of no lower
than 500Hz, by 250Hz you'd have to derate 70W to ~ 10W.

At 200Hz derate to around 3W, you need a bass/mid for this.

And c/o frequency is right in the middle of probable bafflestep,
just to complicate matters further.

sreten.

Ralph · 21st April 2004, 11:19 AM

Thanks sreten

Doesn't look very promissing

The speakers will be run with a 300BXLS tube amp so 15W is all it ever sees so x-over of 350 hz seems resonable. Will do some measurements tonight.

Ralph

sreten · 21st April 2004, 12:04 PM

I used -3dB at crossover for the power ratings.

And 350Hz is on the button for 15W.

If you use Linkwitz / Riley crossovers which are - 6dB
at crossover you get a slightly larger excursion margin.

sreten.

21st April 2004, 09:21 AM	#1
Ralph diyAudio Member Join Date: Apr 2002 Location: Culemborg, The Netherlands	Fostex FF165K enclosure I'm planning to use a Fostex FF165K as mid/high driver together with a Fostex tweeter and Beyma woofer. Active x-over between de Beyma and the FF165K will be around 200hz I think. The Fostex has a x-max of a whopping 0.3mm so excursion limitation is key. I'm looking for suggestions of a enclosure for the driver, pref closed. 4.2 liters seems nice but excursion is larger than at 12 liters. Anyone suggestions? Ralph

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21st April 2004, 10:47 AM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	I've modelled the driver and the cone excursion is much less for 4.2L than it is for the 12L enclosure below 100Hz. However these excursions levels are ridiculous and are only relevant after excursion reduction by the crossover. I'd use 6L to allow for some series resistance in the crossover. I'll also point out excursion limited power handling and max SPL (112dB) indicates a crossover frequency of no lower than 500Hz, by 250Hz you'd have to derate 70W to ~ 10W. At 200Hz derate to around 3W, you need a bass/mid for this. And c/o frequency is right in the middle of probable bafflestep, just to complicate matters further. sreten.

21st April 2004, 11:19 AM	#3
Ralph diyAudio Member Join Date: Apr 2002 Location: Culemborg, The Netherlands	Thanks sreten Doesn't look very promissing The speakers will be run with a 300BXLS tube amp so 15W is all it ever sees so x-over of 350 hz seems resonable. Will do some measurements tonight. Ralph

21st April 2004, 12:04 PM	#4
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	I used -3dB at crossover for the power ratings. And 350Hz is on the button for 15W. If you use Linkwitz / Riley crossovers which are - 6dB at crossover you get a slightly larger excursion margin. sreten.

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