Feature Highlights: 1. Versatile Compatibility – This preamp tone board works seamlessly with most power amplifiers, delivering clear audio amplification and customizable bass, mid, and treble adjustments for an enhanced listening experience. 2. Quality Core Components – Built with the original dual-core NE5532 chip for stable performance and reliable sound processing. 3. Wide Voltage Range – Supports DC 12–24V power input (please note: correct polarity must be observed during wiring). 4. Easy to Connect – Uses a standard 3-pin audio cable for straightforward audio input hookup. 5. Ready to Use – Each kit includes two tone boards, perfect for stereo setups or backup use. Product Details: This tone control board is designed to improve and fine-tune your audio output. It allows you to adjust high, mid, and low frequencies to match your listening preference, giving you greater control over your sound. The board is made from durable PCB material and is compatible with a wide range of power amplifiers. Installation is simple—just connect power and audio input using the included 3P cable. Specifications: - Material: PCB - Power Supply: DC 12–24V - Audio Input: 3-pin audio cable - Core Chip: Dual-core NE5532 - Color: May vary (random) - Package Includes: 2 x tone board kits Note: - Product appearance, color, or printed text may vary slightly between batches—this does not affect performance. - Slight color differences may occur due to lighting or display settings. - Measurement tolerance: +/- 1–3 cm.