FOSTER/FOSTEX FE133

Commentary

13 cm cone type full range unit of FE series.

Roll edge method is adopted.

In consideration of mounting in a small-capacity cabinet, a ferrite magnet is used so that the total height of the speaker is low.

There was a model change around 1976 and it was described as FE133New (FE133N) in the catalog.
Also, in the picture at that time, the magnetic circuit was changed, and there were 2 kinds of variations of 4 Ω and 8 Ω.

Model Rating

Method	Cone type full range speaker
Aperture	13cm
Impedance	4 Ω (around 1976) 8 Ω
Lowest resonance frequency	75 Hz ± 15% 70 Hz (around 1976)
Playback frequency band	Fo ~ 16 kHz
Output sound pressure level	99dB/W/50cm 91dB/W/m (around 1976)
Max Input	13W 18W (Music, circa 1976)
Mo	3g 3.5g (around 1976)
Qo	0.45 0.4 (circa 1976)
Effective vibration radius (a)	5.0cm
Magnet weight	386g 280g (around 1976)
Magnetic flux density	13,000gauss
Total flux	37,000maxwell
Standard enclosure volume	12 liters
Gross weight	1kg 0.95 kg (around 1976)