Color: Random (not selectable) Model and purpose: XHA901 preamp tone board, suitable for use with power amplifiers. It provides audio amplification and tone adjustment for , mid, and low frequencies to improve listening quality. Chip and power: Uses the original dualcore NE5532 chip. Power supply voltage: DC 12–24V. Wiring and input: When wiring, distinguish positive and negative poles. The audio input is a 3P audio cable. Key benefits and performance: Improves audio output with adjustable , mid, and low frequency control. Reliable NE5532 dualcore design for clear, balanced sound. Compatible with a range of power amplifiers thanks to broad DC supply (12–24V). Compatibility and integration: Designed to be used in conjunction with power amplifiers. Input via standard 3P audio cable. Practical use scenarios: Home hifi setup: connect between a source (e.g., CD/streamer) and a power amplifier to tailor the tonal balance and enhance listening experience. DIY audio projects: integrate into custom amplifier builds or upgrades to achieve targeted /mid/low frequency response. Small venues or classrooms: pair with a power amplifier to provide adjustable tone control for improved vocal clarity and overall sound. Important notes: Positive and negative wiring must be distinguished during installation. Color shown is random and not specified.