BK 108 FF by Art of Sound, Günter Damde     as in Hobby HiFi 1/2006

BK 108 FF aus Hobby Hifi 1/2006
Technical data:
- impedance: 8 Ohm
- rated SPL (2.83V/1m): 95 dB
- size (HxWxD): 90 x 20 x 44.5 cm
- frequency range (-3dB): 50 - 23000 Hz
- crossover frequency: 6300 Hz
- speaker type: exponential horn
Using a Fostex kit, originally equipped with a FE 108, Günter Damde of Art of Sound tried out the Fostex FF125 instead. Since the high frequencies were not adequate he added a Fostex FT 17 H turning it into a horn with an excellent price / performance ratio.

The cabinet is ideal for DIY - it consists only of right angle boards, available in most hardware stores.

An excerpt of a review by Hobby HiFi in comparison to the TB-Horn:

  ... "This small horn shows a remarkable enthusiasm. This is, certainly, partly caused by an astonishingly high efficiency. But then, the Fostex horn also displays a totally different approach in sound distribution. While the TB Horn's sound was voluminous and bass heavy with a rather subdued midrange, the BK 108 FF concentrates on the mid frequencies. Bass was tight, clear and remarkably low, but they still fall behind compared with the TB Horn. Positioned closed to the rear wall the difference became negligible. Free standing they tend to be more modest "The O-Zone Percussion Group" showed what the Fostex Horn likes most: Drums in all variations. These small speaker almost seem to explode. It's absolutely amazing, how these speakers come out of their shell. They also manage, however, more sophisticated material: Vivaldi's "Four Seasons" played on original instruments or acapella (Livingston Taylor with "Grandma's Hands") were performed to the full satisfaction of the listeners. They sometimes don't stick to the truth, but that can be forgiven, since the slips are rather subtle. They only become more evident when they are played against reference speakers."

Our standard kit consists of:

- Fostex FT 17 H tweeter
- Fostex FF 125 K full range driver
- 1/2 nap foam N30
- 1/2 mat Bondum 800
- 8 Allen screws 4x16 mm
- 3 metre cable 2x2.5 mm2
- 2 gold plated brass binding posts
- building instruction
- the crossover components to be mounted on wood:
- 2.0 mH air core coil 2.0 mm
- 0.47 mH air core coil 1.0 mm
- 0.15 mH air core coil 0.7 mm
- 5.6 uF MKP capacitor
- 1.5 uF Mundorf MKP/400 V
- 6.8 uF MKP capacitor
- 10 Ohm MOX10 resistor (brown-black-black)

Kit BK 108 FF Standard without cabinet
Price per unit - not available

BK 108 FF High-End

If you prefer to use top quality components throughout we recommend the following parts (changes are indicated in italic)
- Fostex FT 17 H tweeter
- Fostex FF 125 K full range driver
- 1/2 nap foam N30
- 1/2 mat Bondum 800
- 8 Allen screws 4x16 mm
- 3 metre cable Inakustik Premium LS Silver (silver plated) 2x2.5 mm2
- 2 gold plated brass binding posts
- building instruction
- the crossover components to be mounted on wood:
- 0.56 mH air core coil 2.0 mm, vacuum impregnated
- 0.47 mH baked varnish coil/1.0 mm
- 0.15 mH baked varnish coil/0.7 mm
- 5.6 uF MKP capacitor
- 1.5 uF Mundorf Supreme MKP/800 V
- 6.8 uF MKP capacitor
- 10 Ohm MOX10 resistor (brown-black-black)

Kit BK 108 FF High-end without cabinet
Price per unit - not available


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