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Hi-Fi Audio Drivers (Speakers and Tweeters)

Hi-Fi Audio Drivers (Speakers and Tweeters)

These are some of the drivers that we have had the opportunity to try out over the years. The pages contain information about the drivers (transducers) including photographs, history and background information, driver specifications and links to DIY speaker enclosure designs. The Thiele/Small Parameters have been measured for many of the drivers using the Dayton Audio Woofer Tester 3. Questions and discussion about loudspeaker drivers and building is welcome in the DIY Loudspeaker and Subwoofer forum.

Last update: 29 April 2013

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Fullrange Speaker Drivers (Transducers)

Fostex FX120 Fullrange Speaker Driver Cost: $125US (May 2013)
Diameter: 125 mm (5")
Re: 7.3 ohms
Fs: 70 Hz
Qts: 0.45
SPL: 89 dB/W/m
Fostex FX120 Fullrange Speaker Driver
This is my favorite of the small Fostex fullrange drivers. The FX120 driver has a fairly smooth and extended frequency response. Constructed on a cast frame with a large magnet. The cone is KENAF paper and the dust cap metallic. Excursion is small (2 mm) so SPL and low-end extension will be fairly limited. Works well in a wide variety of enclosures. Very good overall performance.

Fostex FE206En Fullrange Speaker Driver Cost: $102US (May 2013)
Diameter: 200 mm (7.9")
Re: 6.8 ohms
Fs: 45 Hz
Qts: 0.19
SPL: 96 dB/W/m
Fostex FE206En Fullrange Speaker Driver
The FE206En is the largest of the economical line of Fostex fullrange drivers. The FE206En has a very large magnet and is constructed on a stamped frame. The thin speaker cone and whizzer paper is made from banana plant fiber. This is a high efficiency driver and the frequency response is very good and detailed through the midrange but peaky and rough on the higher frequencies. A very small excursion (Xmax=0.8 mm) and a very strong motor make this driver a good choice for horn loading. There are also many speaker driver modifications and tweaks for the Fostex FE206En to try.

Fostex FE126En Fullrange Speaker Driver Cost: $50US (May 2013)
Diameter: 120 mm (4.7)
Re: 7.2 ohms
Fs: 83 Hz
Qts: 0.3
SPL: 93 dB/W/m
Fostex FE126En Fullrange Speaker Driver
Another good fullrange driver with high price to performance ratio. The frequency response is ok, but forward. Best used off axis. Huge motor on stamped steel frame. Light paper cone and dust cap made from banana plant fiber. Tiny excursion (0.35 mm) so max SPL and bass will be limited. Best used in horn type enclosure.

Fostex FE103En Fullrange Speaker Driver Cost: $44US (May 2013)
Diameter: 100 mm (3.9")
Re: 7.5 ohms
Fs: 83 Hz
Qts: 0.33
SPL: 89 dB/W/m
Fostex FE103En Fullrange Speaker Driver
Economical fullrange driver with high price to performance ratio. The frequency response is ok, but some may find this driver too forward. Best used slightly off axis. Large motor and stamped steel frame. Light paper cone and dust cap made from banana plant fiber. Tiny excursion (0.6 mm) so max SPL and bass will be limited. As far as low cost fullrange drivers go, the Fostex FE103 series has had a cult like following for decades. There are also many Fostex FE103En speaker driver modifications and tweaks to experiment with.

Horn Super Tweeters

Fostex T90A Horn Super Tweeter Cost: $187US (May 2013)
Re: 8 ohms
Freq: 5 - 35 kHz
SPL: 106 dB/W/m
Cross-over: > 7 kHz
Magnet: Alnico, 100 g
Fostex T90A Horn Super Tweeter
The T90A is a high quality external top-mount horn super tweeter. The super tweeter uses a large alnico magnet and the frequency response extends out to 35 kHz. The horn tweeter has a very high sensitivity rating of 106dB / 1W / 1m. The nominal impedance is 8 ohms and the tweeters are very easy to drive with a small amplifier. The Fostex T90A tweeters are Made in Japan.

Fostex FT96H Horn Super Tweeter Cost: $131US (May 2013)
Re: 8 ohms
Freq: 4 - 33 kHz
SPL: 100 dB/W/m
Cross-over: > 8 kHz
Magnet: Alnico, 34 g
Fostex FT96H Horn Super Tweeter
The FT96H is a very good quality horn super tweeter. The horn super tweeter uses an Alnico magnet and the frequency response extends out to 33 kHz. The FT96H horn tweeters have a high sensitivity rating of 100dB / 1W / 1m. The nominal impedance is 8 ohms and the tweeters are very easy to drive with a small amplifier. The Fostex FT96H tweeters are Made in China.

Fostex FT17H Horn Super Tweeter Cost: $42US (May 2013)
Re: 8 ohms
Freq: 5 - 50 kHz
SPL: 98.5 dB/W/m
Cross-over: > 5 kHz
Magnet: Shielded, 113 g
Fostex FT17H Horn Super Tweeter
The FT17H is a high cost performance horn super tweeter. The horn super tweeter uses a shielded magnet system and the frequency response extends out to 50 kHz. The FT17H horn tweeters have a high sensitivity rating of 98.5 dB / 1W / 1m. The nominal impedance is 8 ohms and the tweeters are very easy to drive with small amplifiers. The Fostex FT17H tweeters are Made in China.

Discontinued Full Range Speaker Drivers (Transducers)

Fostex Drivers

Other Drivers


Discontinued Tweeters and Super Tweeters