The cone is made from entwined long fibres of glass. It is not fibre glass, fibre glass is strength in one direction, this makes it soft in one direction. The base material weighs 0.4 g for the cone, this is then treated with a spec. coating. The end weight is 2.4 g for the cone.
I will get back with some measurements. The unit is special designed for open baffle, therefore the Q is high, it’s around 0.7 to 0.8
I will get back with some measurements. The unit is special designed for open baffle, therefore the Q is high, it’s around 0.7 to 0.8
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I just made two more units and did some measurements Here is the result, note the tolerance is very small.
Unit one: unit two
Fs: 69.98Hz- 71.33Hz
Qms 9.05- 8.88
Qes 0.881- 0.881
Qts 0.803- 0.801
Vas 37.7L -39.3L
Mms 8.51g- 8.47g
Re 5.88 ohm- 5.89 ohm
Cms 0.61mm/N- 0.58mm/N
Le 0.148mH (10KHz)- 0.146 (10KHz)
SPL 95.08 dB 2.83V- 95.13 dB 2.83V
BL 4.99- 5.05
Unit one: unit two
Fs: 69.98Hz- 71.33Hz
Qms 9.05- 8.88
Qes 0.881- 0.881
Qts 0.803- 0.801
Vas 37.7L -39.3L
Mms 8.51g- 8.47g
Re 5.88 ohm- 5.89 ohm
Cms 0.61mm/N- 0.58mm/N
Le 0.148mH (10KHz)- 0.146 (10KHz)
SPL 95.08 dB 2.83V- 95.13 dB 2.83V
BL 4.99- 5.05
Last edited:
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