Fosi Audio BT20A Pro Bass and treble controls with midpoint positioning Bluetooth 2.0 amplifierOp-Amp Rolling: SS3602, MUSES02, OPA2134PA Interchangeable buttons: Orange button TI TPA3255 300 Watt x 2 Output Power Chip AmplifierAdvanced feedback design and high-speed gate driver error correction for efficient and high-quality audio performance with low no-load losses of <2.5W. Improved efficiency: A significant upgrade over the BT20A amplifier with interchangeable op-amps for customization. You can replace the two NE5532 plug-in op-amps with MUSES02/OPA2604AP/SS3602 amplifiers for unparalleled sound quality. With SNR≥108dB and THD≤0.005%.Improved Bluetooth 5.0 connectivity: The Bluetooth connection can be cleared by pressing and holding the volume slider for five seconds. In addition, it has a memory function for easy pairing and alarm sound. Customizable Sound with Bass and Treble Controls: The BT20A Pro Home Audio Amplifier offers a unique design for sound control. Enjoy original sound without effects by setting treble and bass effects to the midpoint. Specification: Output Power: 300Wx2 @4Ω Port impedance: 2-8Ω Input Mode: Bluetooth + RCA Output Mode: Passive Speakers + Pre-Out Frequency Response: 20Hz-20kHz (±1.2dB) THD: ≤0.005% SNR: ≥108dB Chipset: TPA3255 Bluetooth Transmission Distance: Up to 15 meters Bluetooth transmission format: SBC/AAC Device dimensions: 12.7x12.7x2.5cm DC Input Range: 24-48V Power supply: 32V 5A or 48V 5A What`s in the box: BT20A PRO Power Amplifier x 1 48V/5A Power Adapter x 1 Bluetooth Antenna x 1 User’s Manual x 1

Fosi Audio K5 Pro Gaming DAC Headphone Amplifier Mini Hi-Fi Stereo for PS5/PC/MAC/Smartphone Headphone DAC Amp Combo 16-300 Ω Powerful Headphone Drive Bass & Treble Adjustment The updated version of Fosi Audio Q4 offers a microphone function, a K5 Pro headphone-DAC amplifier combination, a next-generation audio converter with unrivaled internals, more outstanding performance, and richer audio details. Born for gaming. K5 Pro Stereo DAC Headphone Amplifier is perfect for your home game system, equivalent to an external sound card, suitable for PS5/computer/PC/MAC/active speaker, etc. The K5 Pro USB DAC converts USB Type-C/optical/coaxial signals into 3.5mm AUX and RCA signals with low distortion and wide dynamic range. Unique Design: 2-in-1 USB Type-C interface charging port and audio input mean K5 Pro is compatible with your phones (Note: your audio source must be connected to the USB A/C port). The RCA output can be connected to an amplifier or powered speaker on your desktop. 3.5MM AUX and microphone interface can drive 16ohm to 300ohm headphones. The K5 Pro headphone DAC uses Texas Instruments' NE5532 op-amp chip. The circuit design that implements this DAC has been optimized for low noise floor and clean sound. K5 Pro has noticeably improved the overall sound quality, making it even easier for you to immerse yourself in your music. Specifications: K5 Pro with master volume/bass/treble control and input selector USB Type-C Rate: up to 24-bit/96kHzOptical/Coaxial Sampling Rate: up to 24-bit/192kHz THD ≤0.003%SNR ≥110 dB Output power: 1000mw@16 Ω, 500mw@32 Ω, 300mw@64 Ω, 150mw@128 Ω, 80mw@300 Ω. Headphone impedance: 16 Ω - 300 Ω Inputs: USB, Optical, Coaxial, 3.5mm Microphone Exits: 3.5mm headphones, RCAUSB Sampling Rate: 16-bit/44.1 kHz to 24-bit/96 kHz Optical/Coaxial Sampling Rate: 16-bit/44.1 kHz to 24-bit/192 kHz Device dimensions: 112 x 95 x 30 mm Net weight: 251 g Power supply interface: USB Type-C What`s in the box: K5 Pro DAC Amplifier x1 3.5mm Headphone Splitter x1 2-in-1 USB Type-A/C to Type-C Cable x1 User Manual x1 optical cable x1

Fosi Audio LC30 Amplifier/Speaker Switcher 2-in-2 outputs Dual Analog VU Meter 2-In 2-Out: Amplifier/Speaker Vintage Optics Large VU Meter Supports up to 250W input/output Multifunctional remote control Vintage Elegance: The LC30 has two large VU meters, complete with adjustable brightness in five levels. It offers versatile connectivity with two inputs and two outputs and allows for four different configurations. In addition to its functional capabilities as a switch, it is an exquisite decorative VU meter that allows you to enjoy a lively, audiovisual feast. Versatile Compatibility: Fully supports a wide range of amplifiers. The large cabinet design not only accommodates two Fosi Audio compact amplifiers, but also integrates seamlessly with traditional Class A, Class B, Class AB and tube amplifiers to meet your diverse needs. Superior components: Integrated with 390-Ω protective load resistors, thickened copper foil circuits, premium speaker terminals, and switching relays, the LC30 ensures virtually no impact or loss of sound quality and supports a maximum power transfer of 250W per channel. So you can enjoy the pure high-fidelity sound. Usability: Offers both button and remote control, allowing you to switch between two amplifiers and two speakers with a tap. It streamlines the process of A/B comparison testing for two amplifiers or speakers and ensures easy accessibility. In addition, adjusting the brightness of the backlight and needle sensitivity is effortlessly easy, which improves the overall user experience. Designed for audiophiles: The LC30 has been specially developed to meet the wishes of hi-fi fans. It embodies Fosi Audio's signature all-aluminum alloy construction for durability and reliability. This device is designed to be a permanent companion to your hi-fi audio system and ensure lasting satisfaction. Specifications: Model LC30 Input - up to 2 amplifiers Output - up to 2 pairs of passive speakers Supported Amplifier Types - BTL, Class A, Class AB, Class B, Class D, Tube Amplifier, etc.Maximum Connector - 250W @ 4Ω (per channel) VU Meter Size - 85 x 45mm VU Meter Brightness Adjustment - 100%, 75%, 50%, 25%Off Idle amplifier protection Built-in 390 Ω resistance protection Supply voltage DC-5V What`s in the box: Fosi Audio LC30 x 1 Instruction manual x 1 Remote control x 2 USB-C Power Cable x 1

Fosi Audio P3 Tube Preamp with Bluetooth aptX LL HD Bass and Treble Tone Controls Authentic Tube Amplification Qualcomm aptX LL Bluetooth Treble & Bass Adjustment Ideal Partner to V3 Amp True tube amplification: The preamp circuit increases the voltage to 54V, ensuring that the tubes reach their full potential and provide a warm and rich experience. The unique preamp technology delivers audio-only signals and faithfully reproduces crisp highs, full mids and deep, rhythmic bass. Bluetooth 5.1: Equipped with the Qualcomm QCC3031 chip, the P3 preamplifier guarantees impressive wireless sound quality and low latency with compatibility for aptX HD and aptX LL codecs formats. In addition, the manual reset button prevents accidental connections by others and increases connection reliability. Versatile Connectors: The P3 offers Bluetooth/RCA inputs and RCA/AUX output/3.5mm headphone outputs. It can help create a 2.1-channel audio system by connecting active speakers/amplifier and a subwoofer. As a headphone amplifier, it supports headphones with an impedance of 16 Ω to 300 Ω. Premium components: It uses audiophile ELNA capacitors and a taper-A potentiometer. The bass and treble controls feature central detents for tone cancellation. With an SNR of up to 103 dB and a crosstalk of 95 dB, it forms a hi-fi audio system when paired with the V3 amplifier from the same series. Specification: RMS power: 250 mW @16Ω; 150 MW @32Ω; 32 MW @250Ω; 20mW @300Ω Headphone impedance: 16-300 Ω Noise floor: 64uV Input Mode: Bluetooth, RCA Output Mode: RCA, 3.5mm Headphone Jack, AUX Output Frequency Response: 20Hz-20kHz (±1dB) Dynamic range: 104 dB THD: ≤0.02% SNR: ≥103dB Crosstalk: 95 dB Bluetooth chip: QCC3031 Bluetooth Version: 5.1 Bluetooth Range: ≥10m Bluetooth codecs: SBC/AAC/aptX/aptX HD/aptX LL Power Consumption DC: 12V/1.5A~3AWhat`s in the box: Fosi Audio P3 Tube Preamp x1 User Manual x1 5654W Vacuum Tube x2 12V/1.5A Power Supply x1

Fosi Audio ZA3 Mono/Stereo Amplifiers 2CH Mono Amp With TPA3255 Chip Dual-Mode Innovation This new generation Fosi Audio Mini amplifier offers both stereo and mono modes, flexibly adapts to your different needs and allows for seamless mode switching. In stereo mode, it delivers robust power of up to 180W, while in mono mode, power increases to a maximum of 235W. Pair two ZA3 devices in mono configuration to create a powerful audio system that greatly enhances your listening experience. Richer connectivity: The ZA3 is a balanced input and trigger input amplifier and features a balanced combo audio input that supports both XLR and 6.3mm jack plugs. This design minimizes interference and reduces noise floor. The 12V trigger-in connector allows synchronization with other devices and optimizes the process of switching on and off without individual operation. Audiophile components: The ZA3 features the TPA3255 high-end Class-D amplifier chip and uses high-quality Japanese NCC, ELNA, and German WIMA capacitors, as well as Japanese Sumida inductors for exceptional audio quality. With a SINAD value of up to 89 dB, a signal-to-noise ratio of up to 106 dB, and a low noise floor of only 150 μV, it delivers exceptional clarity and low distortion. Advanced Heat Dissipation:Based on the V3's groundbreaking heat dissipation design, we improved the ZA3's cooling system by making it larger enclosure, moving the vents to the sides, and adding dust covers to provide better ventilation for sustained and stable high performance. Improved Scalable Fun: Personalize your audio experience with the op-amp's rolling feature! The ZA3 has five interchangeable op-amps for the left and right channel outputs, the balanced input, and the subwoofer output. Experiment with compatible DIP8 dual op-amps such as Sparko's SS3602, MUSES02, OPA2604, OPA2134PA, OP249, AD827, RM4558, LM4562, LME49720HA, etc. to perfectly tune your sound. Specifications: 2.0 Amplifier Chip: Texas Instruments TPA3255 SINAD: 89dB SNR: ≥106dB Dynamic range: ≥106dB THD: <0.006% Speaker Impedance: 2-8Ω Output Power: With 48V/5A PSU Stereo: 180Wx2 @4Ω Mono: 235Wx1 @4Ω Frequency Response: 20Hz - 20KHz(±0.1dB) Input Voltage: DC 24-48V Inputs: RCA, XLR, 1/4" TRS Outputs: Speaker Outputs, Active Subwoofer Connection Dimensions and weight: 15.49 x 18.39 x 5.08 cm; 1.78 kilo Power Adapter: 48V/5A