TRU COMPONENTS 3.54 inch 9 cm Mini speaker 3 W 8 Ω

Impedance (integer): 8 Ω; Max. frequency: 10000 Hz; Max. load (W): 5 W; Min. frequency: 360 Hz; RMS capacity: 3 W; Recess depth: 37.5 mm; Recess diameter: 90 mm; Sound pressure: 87 dB; Speaker features: Ovale, Transparent diaphragm, Damp-proof; Speaker size (cm): 9 cm; Speaker size (inch): 3.54 inch

Price: £ 2.29 from Conrad Electronic