ZK-MT21 2.1 12V-24V Channel Bluetooth Amplifier Board Mini Audio Receiver with Subwoofer Output, Bass Treble Control

ZK-MT21 2.1 Channel Bluetooth Amplifier Board Mini 12V-24V Audio Receiver with Subwoofer Output, Bass Treble Control DIY Home TV Car Stereo Amp for Passive Speakers

ZK-MT21 2.1 12V-24V Channel Bluetooth Amplifier Board Mini Audio Receiver with Subwoofer Output, Bass Treble Control

This Bluetooth amplifier board features a HiFi power amplifier chip that delivers up to 50W per channel. The large heatsink quickly dissipates heat, allowing the chip to deliver sustained high power without risk of damage. Wiring is quick and hassle-free, with no damage to the wires. The 5.5mm x 2.1mm DC input accepts most laptop power adapters. Endless sound possibilities. Experience a mini movie theater at home all from a tiny amp. How to choose a power supply? Use a low-ripple power supply. High ripple causes noise/malfunction. Higher voltage/current = more power. 12V1A for 3-4" speakers; 19V5A+ for 8-10". Low voltage distorts; low current drops voltage or degrades sound. Introduction to audio input modes Two inputs: Bluetooth (priority) and AUX. Bluetooth auto-reconnects once connected. No Bluetooth connection? Insert AUX for AUX mode. Note: Before using AUX, ensure Bluetooth is disconnected How to adjust the main volume? The main volume knob is used to adjust the main volume. The main volume increases when turning right, and decreases when turning left. The main volume has an impact on the volume of both the left and right channels and the subwoofer. Its okay if the sound is low, but when the sound becomes louder, there is a phenomenon of cloudy sound? The sound is distorted. Please reduce the total volume or switch to a higher voltage adapter power supply. Its okay if the sound is low, but when the sound becomes louder, there is a phenomenon of sound lag? Insufficient input power triggers intermittent supply shutdown. Replace with a higher-power supply. Or excessive power overheats the board, causing thermal protection. Reduce power or improve cooling. ZK-MT21 YS-S350H ZK-TB21 ZK-1002T HOCHANAN has specialized in premium home audio-visual systems for years. HOCHANAN specializes in premium home audio-visual systems , we have refined high-fidelity equipmentfrom advanced amplifiers to precision analog componentsto elevate the listener's experience. We are committed to quality and our community, actively using customer feedback to enhance our products and deliver innovative, market-relevant technology.

Brand: HOCHANAN

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Key Features

• ✓ Big Power in Tiny SizeDrives left/right speakers (50W each, 4-8) plus subwoofer (100W). Perfect for bookshelf speakers, TV soundbars, or DIY boomboxes.
• ✓ Dual Input Modes Bluetooth & AUX Stream wirelessly via Bluetooth 5.0 (up to 33ft) or connect any device using the 3.5mm AUX input. Works with phones, TVs, computers, and more.
• ✓ More Power with 24V Supply Runs on DC 12V-24V / 5A or above (power supply NOT included). Higher voltage = bigger sound. Users say 24V makes it "room-shaking."
• ✓ Full Tone Control Knobs Separate controls for master volume, sub level, sub frequency (20-200Hz), plus bass and treble for left/right channels. Fine-tune your perfect sound.
• ✓ Easy DIY AssemblyComes with top/bottom covers, 8 small screws, 5 knob caps, and a screwdriver. Barely gets warm even after hours of use. Great for reviving old speakers.

Product Details

• ✓ Included Components: as the picture

Shipping & Guarantees

• ✓ FREE standard shipping within the United States (3-6 business days)
• ✓ 100% money-back guarantee for lost or damaged items
• ✓ Secure checkout with encrypted payment processing
• ✓ Shipping via UPS, FedEx, and USPS
• ✓ Ships to lower 48 states only (no PO Boxes / APO / FPO)

Returns

• ✓ 30-day hassle-free returns
• ✓ Items must be unused and in original packaging
• ✓ Full refund if item is not delivered
• ✓ Guaranteed delivery within 6-7 business days

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