Turbine Speaker

thingiverse

This is my design for a speaker housing that perfectly fits the Tang Band W4-655 speaker, and I'm confident that other speakers will also fit in - please let me know which ones so I can add them to the list. This speaker is an extremely affordable option (~40€ each) with remarkably low distortion (clink) and 40W power output (80W music) across a wide frequency range of 70Hz-14000Hz. The housing has been specially designed for the Tang Band W4-655 speaker, featuring a bass reflex channel to minimize its size while still delivering an exceptional PC speaker experience at your desk. The volume and bass reflex channel are carefully tuned to match the speaker's specifications. Here are the key properties of this incredible speaker: Resonant frequency: 70Hz Electrical Q factor: 0.31 Mechanical Q factor: 5.57 Total Q factor: 0.29 Suspension equivalent air volume: 6.01 liters DC resistance: 6 ohms Voice coil inductance: 0.124 millihenries Force factor: 5.84 T-m Mechanical resistance: 0.3 Newtons per meter per second Suspension mechanical compliance: 1303 micrometers per Newton Moving mass: 3.7 grams Moving mass (including airload): 3.99 grams Diaphragm surface area: 57 square centimeters Effective diaphragm diameter: 8.5 centimeters Maximum linear excursion: ±3.3 millimeters Displacement volume at Xmax: 18.8 cubic centimeters Efficiency: 0.65% Efficiency bandwidth product: 225 I've carefully calculated the housing's dimensions, and I'm pleased to report that it matches the manufacturer's parameters for a conventional design with a 2.7 liter volume. The bass reflex opening is also optimized (50mm diameter and 30mm length). To secure the speaker in place, I use four DIN 7983 4.2x19mm screws. Additionally, I've soldered on 2.5mm² wire and connected it to a high-quality 2x100W Class D amplifier. --- UPDATE 2020.03.24: I've added frequency response measurements, which appear to be satisfactory except for a minor bump around 700Hz. This can likely be compensated with an equalizer. I've also included photos of the base design.