Experience superior audio enhancement with this versatile preamplifier designed to fit the majority of active speakers and power amplifiers on the market. Featuring a replaceable 6K4 vacuum tube design, it optimizes the audio circuit to deliver soft, beautiful timbre with sweet and warm tones, powerful bass, and penetrating treble for an enriched listening experience. Key Features: · Wide Compatibility: Compatible with most active speakers and power amplifiers, making it a practical choice for various audio setups. · Replaceable 6K4 Vacuum Tubes: Enables circuit optimization and easy maintenance, ensuring long-term performance and sound quality. · Fully Separated Audio and Power Sections: Minimizes interference, delivering cleaner sound with improved clarity. · Adjustable Treble and Bass: Offers ±6dB treble and ±10dB bass adjustment to customize your audio output to your preference. · High Signal-to-Noise Ratio: With a SNR of 100dB and ultra-low total harmonic distortion (THD) of 0.03%, it guarantees crystal-clear sound reproduction. · Durable Aluminum Alloy Housing with Gold-Plated Connectors: Ensures robust construction, corrosion resistance, and reliable connectivity. · Compact and Portable Design: Measuring approximately 12 x 9.8 x 3.3 cm and weighing just 318g, this preamplifier is easy to carry and integrate into your audio system. · Dual Power Supply Options: Supports AC 100-240V, 50/60Hz input and DC 12V/1A, providing flexible power solutions. Specifications: · Tube Model: 6K4 · Frequency Response: ±1.5dB (20Hz-20KHz) · Audio Input/Output Interface: RCA · RCA Output Voltage: 0.9Vrms · Treble Adjustable Range: ±6dB · Bass Adjustable Range: ±10dB · Input Voltage: AC 100-240V, 50/60Hz; DC 12V/1A · Color Options: Black, Silver · Dimensions: 12 x 9.8 x 3.3 cm (4.72 x 3.85 x 1.29 in) · Weight: 318g (11.21oz) Package Includes: · 1 x Preamplifier · 1 x Power Adapter · 1 x User Manual (English & Chinese) This preamplifier combines high-performance vacuum tube technology with durable construction to enhance your audio setup with warm, dynamic sound. Its compact design and adjustable audio settings make it an ideal choice for audiophiles seeking convenience and premium sound quality in a portable device.