Turbine Speaker
Description
This is my desing of an speaker housing for an Tang Band W4-655 speaker (propably other speaker also fit in, you can tell me and I will add them). This speaker is a very cheap ( ~40€ each speaker - i use 2 for stereo; other compareable speaker cost around 100€/speaker) HiFi speaker with very low clink and 40W power (80W music) with a bandwith from 70Hz-14000Hz The housing is specal designed for the Tang Band W4-655 speaker with a bass reflex channel to have a quiet small housing to use them as PC speaker at your desk. So the volume and the bass refelx channel is tuned for the speaker. Properties of the speaker are: Resonant frequency fS 70 Hz Electrical Q QES 0.31 Mechanical Q QMS 5.57 Total Q factor QTS 0.29 Suspension equivalent air volume VAS 6.01 litres DC resistance RE 6 Ω Voice coil inductance LE 0.124 mH Force factor B·l 5.84 T·m Mechanical resistance RMS 0.3 N·s/m Suspension mechanical compliance CMS 1303 µm/N Moving mass MMD 3.7 g Moving mass (including airload) MMS 3.99 g Surface of the diaphragm SD 57 cm² Effective diaphragm diameter Ø 8.5 cm Maximum linear excursion Xmax ± 3.3 mm Displacement volume at Xmax VD 18.8 cm³ Efficiency η₀ 0.65 % Efficiency bandwidth product EBP 225 I found some conventional housing builds with 2.7 lite volume and with the manufacturer parameters i also calculated this value. Same as the bass reflex opening (50mm diameter and 30mm lengh). To fix the speaker in the housing i use 4x DIN 7983 4,2x19mm screws. I also solderd 2,5mm² wire and using a 2x100W Class D amplifier --- UPDATE 2020.03.24 --- Added frequency response measurement. Looks quiet good except the bump arount 700Hz. This should be compensable with an EQ. Also addes pictures of the base.
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