“ These are amazing. If you can get them for a low price, do so. They are a bit uncomfortable, so you might not want to use them for long periods of time. Their clarity is fantastic though, the bass while not being big in quantity is extremely accurate and with a decent amp (I'm using the 300 Ohm version of the headphones) it is just fantastic in quality. Despite being a closed headphone...” --FirsToStrike
“So, first of all you might be wondering why even bother reviewing a headphone that nobody knows about, has ever heard of, and most likely will never own or see in real life? Simply put, I think that this headphone deserves it. There are many of the 70's Pioneer clones, so it's good to give people an idea about them if there is any interest. Pros: - Aesthetics and construction are...” --GREQ
From an old MB Quart brochure (circa late 80s): The Quart Phone 50 Dynamic, semi-open headphone. Coupling: circumaural. Frequency response: 10 Hz - 22 kHz. Nominal Impedance: 120 ohms (x2). Sound Pressure Level: 96 dB. Rated Power Handling: 0.1 watt. Distortion <0.5%. Weight (without cord): 245 grams.