[400W Powerful Output] The AK50 Digital Audio Amplifier (Upgraded version of AK45 amplifier) features a fully upgraded design with 400W+400W peak power and 50W+50W rated power. It introduces an innovative feature, supporting not only 4-16 inch passive speakers but also active subwoofers. Perfect for home karaoke, home theaters, and HiFi sound systems, it is ideal for small apartments, bedrooms, offices, basements, and garages. Its compact design fits effortlessly into bookshelves or A/V cabinets. [Mic Input & Output with Echo Control] Equipped with both MIC input and MIC output ports, along with an independent Echo adjustment knob, making it perfect for karaoke, announcements, or live speaking.

Easily connect to an external speaker (active subwoofer) or recording device for expanded use. [Enhanced Bluetooth 5.0 Wider & More Stable Range] Features advanced Bluetooth 5.0 technology with extended transmission range and faster pairing. Provides seamless wireless streaming up to 50ft/15m (open area), making music control more flexible. [USB/SD Card Plug & Play] Supports USB 2.0 flash drives and SD cards for direct MP3 playback. No need for a phone or PC simply plug in and enjoy your music library instantly. [Bass, Treble & Remote Control] Designed with independent knobs for Bass, Treble, Master Volume, Mic Volume, and Echo, allowing full sound customization.

Includes a remote control for convenient audio adjustments from a distance. [Wide Compatibility for Multiple Scenarios] Compatible with mobile phones, tablets, laptops, TVs, DVD players, and more. Ideal for home speakers, bookshelf speakers, gaming setups, car audio systems, outdoor garden speakers, or small party use