Douk Audio B1 Mini 5 Band EQ Equalizer Bluetooth Receiver Stereo Audio Small Preamplifier with VU Meter &

---------------------------------------------------------------------- 【Voltage Compatibility】 When using electrical appliances, please note that they are designed for Japanese voltage specifications (90-110V), so if you use them with a different voltage, it may cause a malfunction. 【Plug Type】 Our products use Japanese plug types (A or B type). Please use a conversion adapter if necessary. 【Important Note on Transformers and Adapters】 A transformer adjusts voltage to match your device’s requirements. A conversion adapter only changes the plug shape and does not adjust voltage. Using only a conversion adapter without a transformer may result in damage to the product. 【Liability】 We are not responsible for malfunctions or damages caused by improper use, such as operating the product without a transformer. ---------------------------------------------------------------------- 1. 5-band EQ equalizer and preamp function Individual frequency bands can be adjusted in 5 bands: 75Hz/400Hz/800Hz/4KHz/10KHz. Each band is processed by an independent operational amplifier, which compensates for speaker and soundfield imperfections and balances high, middle, and low frequencies to optimize different sound sources. 2. Adjustable VU Meter and Bluetooth Input Dual large VU meters (45mm) powered by a dedicated VU driver chip. Adjustable background light, needle speed, and gain dynamically color your audio environment and provide unparalleled visual effects. Added Bluetooth 5.0 input, making it easy to enjoy HiFi music with wireless connection. 3. Bypass design and balance adjustment Equipped with a bypass mode that allows you to turn off the EQ preamp, and the audio signal is output directly from IN to OUT without processing. This makes it easy to enjoy the original sound. There is also a balance adjustment function for left and right channels to keep the sound field centered. 4. Attractive and strong design Metal case and aluminum nut machined knob for excellent shielding performance. All I/O interfaces are gold plated to ensure smooth transmission of original audio signals and minimize signal loss. Mini size and DC 5V operation, highly portable and easy to use in many scenarios. 5. Compact and high-performance audio component Despite its compact size, Douk Audio's B1 provides high-quality reproduction and adjustment functions for audio signals. With VU meter visual feedback and Bluetooth 5.0 fast and stable transmission, users can enjoy the optimal sound experience at home or on the go. Tags: amplifier vacuum tube amplifier vacuum tube amplifier kit phono equalizer amplifier integrated amplifier vacuum tube 5.1ch amplifier amplifier small vacuum tube preamp vacuum tube radio