Youtube review: Photos: http://dalethorn.com/Photos/iPhone_XsMax/Headphone_Marantz_Mph4_01.jpg http://dalethorn.com/Photos/Audioforge/Marantz_Mph4.jpg Sources: iPhone XsMax with Oppo HA-2/AudioQuest DragonFly Red DAC/amps, various computers using the Meridian Explorer2/AudioQuest DragonFly Red/DAC-amps. Review note: My first impressions of the sound of the Marantz MPH-4 headphone ('MPH-4' hereafter) are based on direct comparisons to other headphones, particularly those that resemble its design (Full-size closed-back 'Studio Monitor'), but also to a few premium headphones for reference. I'll describe how I relate to the MPH-4 (i.e., my objectives and how I use the headphone) only after covering all of the technical issues. Disclaimer: The basic tonality of this headphone is somewhat light in the bass and bright in the upper treble (for audiophile purposes). This judgement is based not on hearing per se, nor on personal taste, but on direct comparison to many other premium headphones and the sound of live acoustic music. With just the right EQ (for those who might be skeptical about my impressions), the clarity, impact, and tonality of the MPH-4 is very impressive. After some burn-in and 40 hours or so of listening, the adjustments I've made with an equalizer are as noted in the above linked chart, or on my website under Hi-Fi Misc/Headphone EQ with Audioforge Equalizer. This kind of tuning isn't unusual for Monitor-type headphones. I'd guess (since I no longer possess it) that the Sennheiser HD800 has about 3 db more bass and 3 db less treble than the MPH-4, and since I find the HD800 slightly light and bright as well, I've increased the MPH-4's lower bass by about 6 db and reduced its upper treble by approximately 8 db. My result is a very good hi-fi sound with plenty of detail and clarity, although (perhaps) you could do better starting with a good $900 USD headphone. It's doubtful that you could better this result with an under-$200 headphone, given that I paid $60 for the MPH-4 brand new from a major hi-fi dealer. Before writing this I did some research on the MPH-4, and several complaints were made that since "The MPH-4 is just a cheap OEM headphone, that's why there are no 'real' reviews". Well this is a real review, for audiophiles no less, and best of all it's not a monetized (commercial) review. The soundstage is really good (again, bear in mind a proper EQ) - unusually so for a closed-back headphone. That, coupled with excellent accuracy and tonality make the MPH-4 an excellent value. The drivers are stated as 50 mm, and the left-right matching at different frequencies is very good with my copy of the MPH-4. The MPH-4 came with plastic-covered foam earpads installed, which are among my favorites because they don't tend to accumulate sweat and oils that can change the sound over time. The downside for some users is that the earcups can get rather warm, and sweat may accumulate in the earcups. The MPH-4's earcups are oval-shaped, and my average-size ears fit into the openings with room to spare. The MPH-4's isolation is moderate - good enough for most home use and outdoor use where it's relatively quiet, but shouldn't be relied on in very noisy environments. Leakage is pretty low, and playing music moderately loud in a quiet office might work, unless someone sitting very close by hears the sound faintly and objects. The MPH-4 comes with a straight 10-ft non-detachable cable. The headband is very well padded, but the headband's range of adjustment is odd - less than 1/4 inch larger on each side than where I set it for my head, but a good inch smaller on each side - obviously for very small heads. The MPH-4 can be worn around the neck all day if needed, but it cramps my chin even when the earcups are fully extended. The MPH-4 came in a nicely printed thin cardboard box, with only a 1/4 inch (6.35 mm) screw-on adapter. Despite the low cost and inexpensive build, the quality control seems excellent and the aesthetics are good, so if users treat it well and don't bang it around or sit on it, it should last a long time. In previous reviews I've included the following music samples with comments about how the headphones sound with each track. My suggestion is instead of reading each one as an absolute unto itself, you could compare my notes here to those other reviews and see how the MPH-4 compares with each individual track. These tracks were evaluated using EQ settings as I noted above. Note that this EQ is not to "personal taste", but rather to approximate the headphone sound to the sound of live acoustic music.