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
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
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.
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.
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