Mami Variable Q and strong magnet. Let me ask you other questions regarding the ffees-r units. A friend of mine ordered a pair of Fostex E for himself and for me. We love music as much as you do.
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The data sheet indicates that the FEEn model uses a new diaphragm material which aids in improving the mid to high frequency reproduction. The driver is mm 7. Like the similar FE driver the "ES cone" is made from banana plant fibre. The light weight paper cone is attached with a reverse roll surround made from treated cloth.
The ferrite magnet is huge, mm 5. The overall weight of he driver is grams 7 lbs. The FEEn has a low Qts which makes this driver most useful in horn type enclosures. A speaker box plan of a back loaded horn type enclosure was included with the data sheet. Fostex FEEn Fullrange Speaker Driver The frame is stamped steel and relatively light so there are benefits to adding mass dampen to reduce the potential of having the chassis "ring". Common methods are to use electrical duct seal or adhesive bitumen damping material.
It is also a good idea to cover The surface of the large magnet could act like a reflective surface in the enclosure so it is a good idea to cover the magnet with a sound absorbent material like upholstery felt.
Fostex FE206En Fullrange Speaker Driver (Transducer)
FOSTEX FE206ES-R PDF