Package Includes: (1) Mackie MC-150 Closed-Back Studio Monitoring or DJ Headphones w/50mm Drivers (1) Rockville TubeHead Tube Headphone Amplifier Amp / 6K4 Tubes / 16-300Ohms/180mW Description: Whether you re referencing your mix in the studio or producing your next track MC Series Headphones allow you to take the Mackie studio sound trusted byartists around the world wherever you go.? MONITORING ON A WHOLE NEW LEVEL: Whether you are tracking in the studio mixing on your laptop or even holding aboom on a set – having accurate sturdy headphones are essential. Building onour studio monitor legacy MC Series headphones offer the clarity and accuracyMackie is known for in professional closed-back designs. Choose between thehigh-performance MC-150 that is perfect for studio monitoring and DJs and theMC-250 for reference quality sound that is great for critical listening andmixing. Both models feature large 50mm drivers for clear distortion-free soundwith ergonomic headbands and ear pads for hours of listening comfort in thestudio or on the go. Features: High-Performance Studio Headphones Experience the signature Mackie studio sound in headphones that reveal everydetail Featuring precision 50mm transducers MC-150 headphones deliver incredibleclarity across the entire frequency for an immersive listening experience Increased bass response means you feel every note kick drum and deep synth inyour music Professional Design The soft padded adjustable headband and conforming ear pads provide an ergonomicfit for hours of comfort while ensuring optimal low-end and sound isolation. Rugged design is built to last and meet the demands of professionals in thestudio or on location Take Them Anywhere Collapsible fold-up design allows for easy storage and compact portability whentraveling Perfect for studio monitoring DJs field recording personal listening 9.8 ft. detachable high-quality straight cable with locking bayonet connector Gold-plated 1/4” adapter and carry bag included Frequency Response: 15Hz – 20kHz Impedance: 33 Ohms Transducer size: 50 mm Sensitivity: 93 dB Weight: 265g / 9.35 oz Video of TubeHead: Features: Rockville TubeHead Tube Headphone Amplifier Tube: 6K4 (These are great quality and engineered to sound best in this amp) 3.5mm audio line input RCA line input 6.35mm headphone output Perfect for 16 ohm to 600 ohm headphones Power Output: 100mW@16Ω 180mW@32Ω， 112mW@64Ω， 64mW@120Ω， 27mW@300Ω The above are true power ratings at 0.03% THD. Please note some other brands putratings like 2000mw but that would be at 10 % THD and at a higher voltage whichis not a normal listening condition THD: 0.03% S/N Ratio: 106dB Volume control knob Toggle Switch on/off Selectable Line 1 and Line 2 input selection switch Power light indicator Gain: 1.89 dB with 0.775Vrms input @ 32ohm impedance Crosstalk: 70 dB DC Power Supply: 12V 1A Universal 110/220 power supply for worldwide use Unit Weight: 1.02lbs Unit Size: 3.94 x 3.74 x 0.9 inch ( L x W x H)