{"product_id":"zk-502e-50w-2-high-and-bass-adjustment-preamp-audio-power-amplifier-module-subwoofer-bluetooth-5-0-dual-channel-stereo-with-aluminum-shell","title":"50W*2 High and Bass Adjustment Preamp Audio Power Amplifier Module Subwoofer Bluetooth 5.0 Dual-channel Stereo with Aluminum Shell","description":"Specifications: \u003cbr\u003e\nInput power: voltage DC12-24V, current above 5A. \u003cbr\u003e\nAmplifier output: MAX 50W*2 @24V\/4ohm. \u003cbr\u003e\nSpeaker parameters: 4-8ohm; 20-100W. \u003cbr\u003e\nInput sensitivity: 800mV. \u003cbr\u003e\nSignal to noise ratio: \u0026gt;90dB. \u003cbr\u003e\nFrequency response: 20Hz-18KHz. \u003cbr\u003e\nBare machine size: 103mm*88mm*30mm (not including the height of the knob seat). \u003cbr\u003e\nPackage weight: about 335g. \u003cbr\u003e\nPacking size: about 160*155*73mm. \u003cbr\u003e\n  \u003cbr\u003e\nInstructions: \u003cbr\u003e\n1. Connect the power amplifier output to the speaker or speaker, R connect to the right channel, and L connect to the left channel (note that the polarity of the speaker is not reversed, the sound will be muddy if it is reversed). \u003cbr\u003e\n2. Connect to the power supply (the power supply can only be connected to direct current, the voltage should not exceed 25V, and the nominal 24V battery pack should not be connected). \u003cbr\u003e\n3. Turn the volume knob clockwise to turn it on, there will be a Bluetooth notification sound, and the blue light flashes at this time.\u003cbr\u003e\n4. Choose the audio input mode that suits you to input audio. The audio input mode can only be selected from one of three, and cannot be activated at the same time. The audio input mode can be automatically recognized (automatically recognized with priority, USB input\u0026gt;AUX input\u0026gt;Bluetooth input), or manually switched (when multiple audio is connected at the same time, long press the pause\/play button to switch the audio input mode) . \u003cbr\u003e\n5. Rotate the volume knob, treble knob, and bass knob to adjust the volume and treble and bass gain to appropriate positions. \u003cbr\u003e\n  \u003cbr\u003e\nPackage includes: \u003cbr\u003e\n1 x Amplifier Module","brand":"GreenZech","offers":[{"title":"Default Title","offer_id":44968256503978,"sku":"GZCMB-3333-01-EC","price":57.1,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0280\/6179\/4375\/files\/e599553e-eb21-44b0-bfe2-eeaa7bbee236_b68b007e-3c19-4262-a2ab-ee82c5205883.jpg?v=1690771052","url":"https:\/\/greenzech.com\/products\/zk-502e-50w-2-high-and-bass-adjustment-preamp-audio-power-amplifier-module-subwoofer-bluetooth-5-0-dual-channel-stereo-with-aluminum-shell","provider":"GreenZech","version":"1.0","type":"link"}