Fostex FF85K in the Buschhorn Mk I? - Page 10 - diyAudio
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Old 10th July 2013, 09:33 PM   #91
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Are theese still up and running?
Are you satisfied with the sound or do you have further suggestions for improvements?
I have a pair of FF85K and think theese cabinets looks nice
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Old 11th July 2013, 03:19 PM   #92
DrBoar is offline DrBoar  Sweden
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You could look into the CT164 horn as well for such a small driver
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Old 11th July 2013, 03:40 PM   #93
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You'd need to do some (major) modifications to it for the smaller driver. As-is, it's tuned too low.

Last edited by Scottmoose; 11th July 2013 at 04:07 PM.
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Old 12th July 2013, 07:00 AM   #94
DrBoar is offline DrBoar  Sweden
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Apart from Surface area the CT164 driver and the FF85 are not that dissimilar, se below

A problem common to all small drivers in backloaded horn is that above the working range of the backloaded horn say 150-300 Hz they are small drivers in a closed box struggling in the range were music is the loudest. Icing on the cake is that the baffle loading is low in a narrow baffle with a driver placed in one extreme end of the baffle so both the Buschhorn and the CT164 share this aggrevating feature.

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hifisound eShop * -* FOSTEX FF 85 WK - BREITBAND * A
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Old 12th July 2013, 09:03 AM   #95
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Yes, I'm rather familiar with both units. The CT164 is tuned way too low for the FF85k IMO, or to put it another way, given the physics of horn loading, it isn't big enough. It needs the driver to do far more work than the little 85 is capable of without chronic distortion.

Can't say I entirely agree that the midrange is the area they most struggle in; the LF is the problem region from my POV, given that's where most of the acoustical power-demands lie. They're never going to be the units of choice for high sustained SPLs or dynamic range of course, so if that's the priority, they're the wrong units, period.
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