1. High-Quality Audio Processing: The ZK-PRO2 Front Tone Board features six NE5532 operational amplifier chips, ensuring superior audio processing for a rich and immersive listening experience. 2. Flexible Audio Connectivity: The unit offers versatile audio input and output options, including XH2.54-3P interfaces for both differential/balanced and single-ended/unbalanced connections. This flexibility allows seamless integration with a variety of audio systems and power amplifiers. 3. Enhanced Tone Control: The included 50K duplex potentiometer with a 6mm quincunx handle allows for precise tone adjustments. You can easily fine-tune the audio output to match your preferences, creating a sound profile. 4. Sturdy Build and Compact Design: With its compact dimensions, the ZK-PR02 Front Tone Board is designed to fit into various setups without taking up too much space. Its robust build ensures durability and longevity, making it a reliable addition to your audio setup. 5. Easy Installation and Compatibility: The ZK-PR02 comes with a shielded wire for audio input and XH2.54-3P terminals for output connections. It's compatible with a range of downstream power amplifiers, including models like ZK-1602 and ZK-3002, providing hassle-free installation and integration. Product parameters: Product Name:ZK-PR02 front tone board Input voltage:12-26VDC,cannotinput AC power Working current:28mA BT encoding format: SBC/AAC/APTX/APTX-HD Input method:BT+AUX Audio inputinterface:3.5mm audio female socket BT distance:15 meters Audio output interface: left and right stereo, subwoofer 1,subwoofer 2, three XH2.54-3P terminals, can be connected to pure rear stage amplifiers such as ZK-1602 and ZK-3002. Gift two 3P dual head audio cables Operationalamplifier chip: sixTl original NE5532 chips Potentiometer: 50Kdual potentiometer, 6mm plum blossom handle,potentiometer spacing 23.5mm Color: Black Material: PCB+Plastic+Metal Package Contents: 1 * Preamplifier tone board 2 * 3P audio cable Only