
Thank you for purchasing the Fostex product. Please
read this manual thoroughly before startusing and use
the product correctly.
HORN TWEETER
FT17H
The model FT17H is an easy to use high performance horn tweeter. With its precisely engineered horn part and
specially made diaphragm, it offers sharp sound and high efficiency. Its magnetic circuit is constructed with low
magnetic leakage, and it can be used as a plus-one tweeter for main speaker system just with plain network. It is
suited to use in combination with Fostex FE-series or FF-series full range speaker drivers.
• Tweeter should be connected to either woofer or mid-range driver
via dividing network. Use as high quality components as possible
for the dividing network. If you used poor quality components for
the network, the sound would be drastically deteriorated and
distorted. We recommend using Fostex network components and
attenuator model R80B.
Main Features
This is an example of the FE206En installed in the back loaded horn box
BK206En adding an FT17H as plus-one tweeter. The network consists of one
piece of film type capacitor connected in series and it offers 6dB/Oct filtering.
We recommend the value of capacitor as 1uF.
Connect the capacitor to FE206En in phase. Locate the FT17H on the top of
BK206En enclosure and about 45 mm retracted position from the BK206En
Practical Application
FE206En+FT17H+BK206En
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OWNER’S MANUAL
FE206En
FT17H
Capacitor
1µF
5,000Hz
7,000Hz
10,000Hz
2.2
1.5
1.0
0.3
0.18
0.14
12dB/Oct.
C (µF) L (mH)
Cross-over Frequency
6dB/Oct. C
Input
2.2µF or less Tweeter
(8Ω)
Attenuator
C
L
12dB/Oct.
Input Tweeter
(8Ω)
Attenuator
baffle board, i.e., measure the distance at the flat surface of FT17H outer horn. This positioning will make
smooth association of main speaker and tweeter. We recommend the use of tweeter base when locating the
FT17H. Please refer to the tweeter base drawing below.
Tweeter Base Assembly Drawing Tweeter Base Board Cutting Plan
(Board Material: MDF T15)
* Caution
The FT17H magnetic circuit is not completely leakage
free and a slight leakage is observed at its right behind
direction. Do NOT place any magnetically susceptive
media within 10cm at right behind the magnetic
circuit.
Outer & Installation Hole Dimensions
R38
4-Ø 4.5
Ø 87
Ø 65
Ø 44
RED DOT
Ø 62.5
38.0
49.5
#110 #110
Polarity: Plus (+)
Specifications
Type
Impedance
Freq. Response
SPL
Input
Cut-off Freqeuncy
Recommended
Cross-over Freq.
Magnet Weight
Total Weight
16 mm horn tweeter
8 Ω
5 kHz ~ 35 kHz
96 dB/W (1 m)
30 W (Music)
2.6 kHz
5.0 kHz or higher
113. 5 g
340 g
Frequency Response
Tweeter and Dividing Network
• If you use 6dB/Oct. network, it is recommended to use a capacitor
whose capacity is 2.2uF or less. Use a high quality film capacitor.
* Caution
It is not good to connect a tweeter directly to an amplifier. Doing
so would cause a break of voice coil wire and buzz sound. Please
connect a tweeter via the dividing network.
• Specifications and appearance are subject to change
without notice for product improvement.
60
70
80
90
100
110
120
(dB)
Ω
64
32
16
8
4
50 100 200 500 1K 2K 5K 10K 20K
Hz 50K
30º
60º
0º
Impedance
FOSTEX COMPANY
1-1-109, Tsutsujigaoka, Akishima City, Tokyo, 196-8550, Japan
(UNIT: mm)
(UNIT: mm)
(UNIT: mm)