Cayin HA-300MK2 Offers Highly Refined Elegance in Sound and Design DHT Amplification provides tube goodness with a clean linear output Delivers up to 6W for headphones and 8W for speakers with it's dual outputs Flexible inputs and outputs, with adjustable impedance let you use HA-300MK2 with a variety of setups The Pursuit of Direct Heated Triode (DHT) Perfection DHT refers to triode tubes that use the cathode as the filament and heat up the cathode directly. This simple approach offers stellar dynamics, excellent representation of transients, and a transparent presentation. Using this design for headphones is even more challenging because DHT designs are sensitive to shock, vibration, and electrical inference. The Irresistible 300B HA-300MK2 uses a matched pair of Golden Lion PX300B low-noise audio triodes, which are renowned for their dreamy tonal characteristics, as its power output tubes. Each tube used by Cayin is tested for reliability, natural sound signature, and frequency extension. Less is More HA-300MK2 is a Single-Ended Triode Amplifier (SET) which uses a single vacuum tube to amplify the signal. Combined with a 2-stage amplification design, this provides a clear, linear amplification. New Old Stock (NOS) Rectifier Tubes HA-300MK2 uses 4x NOS RCA 22DE4, one of the best versions of the 22DE4 available. The rectifier stage converts incoming power to DC current, and Cayin's design offers clean power with minimum interference. Speaker Output HA-300MK2 also functions are a speaker amp, with a 8W per channel Class A output. You can connect speakers and seamlessly switch between headphones and speaker output. Key Features Impedance Matched Headphone Output: choose from Low, Medium, or High impedance to match your headphones Optimized Headphone Outputs: the 4-pin XLR will provide the maximum power while the 4.4mm output allows for compatibility with high-end IEMs and more sensitive options. 60 second start up delay circuit: Protects your tubes and minimizes noise related to the warm up cycle of the amplifier Specifications Tubes: Power: Genalex PX300Bx2 Drive: Tung-Sol 6SN7GTBx2 Rectifier: RCA 22DE4x4 Analog Inputs RCAx2 XLRx2 Output Power 3.5mm Single Ended: 1200mW (L), 2200mW (M), 5000mW (H) 4.4mm Balanced: 1400mW (L), 2200mW (M), 5400mW (H) Balanced/Ultra-Linear: 2000mW (L), 2400mW (M), 6000mW (H) Speakers: 8W per channel THD: <1% SNR: 100dB Weight (Amplifier): 19kg Weight (Power Supply): 12kg Dimensions (Amplifier): 286mm x 368mm x 210mm Dimensions (Power Supply): 150mm x 345mm x 210mm Power Consumption: 185W In the Box HA-300MK2 Amplifier Power Supply Tubes Power Cable User Manual