Monacor Sound-4BT/WS - 2-way speaker stereo system with Bluetooth receiver, active/passive, Class-D amplifier, power: 2x 30 W, frequency range: 45 Hz - 20 kHz, speakers: 1"" tweeter/ 4"" woofer, max SPL: 98 dB per speaker, Bluetooth 4. 0, inputs: Cinch (RCA), 3.5 mm TRS jack, Toslink (optical digital input),