Looking for affordable monitoring headphones ("cans") for studio tracking, I compared Superlux HD660, Superlux HD665, t.bone HD 990D, Vic Firth SiH2 and Beyerdynamic DT-770M to each other and to my DT-770 pro 80. I know, not a really fair reference, but my idea was to seek for cans that would not cost more, preferably less than my DT-770 and still would have proper, useful sound quality. From the models selected, you can guess that acoustic isolation was also a desirable feature, to prevent the sound from the cans bleeding into e.g. a singer's mic and thus saving time cleaning up tracks from this bleed. That is why I also searched among headphones dedicated to drummers. I will review all of the models mentioned, each in their own product page. Here we go for the Superlux HD-665.
As far headphones ever do, the HD-665 does not make you look sexy, rather like wearing Mickey Mouse ears or the type of noise blocking headphones to protect your ears when moving the lawn - and actually, for a great deal, the HD-665 is just that. It claims to reduce noise by 30dBA, and that claim seems fair: it is the only pair of cans I tested that really blocked outside noise significantly (but not completely), and, reversely, let hardly any sound from its drivers bleed into the world outside (all models compared at a similar, "normal" loudness level, of course). This might be a real time saver when it comes to editing and cleaning up recorded tracks!
Its construction is of a simple but sturdy and one-size-fits-all design, that seems to be able to withstand some "heavy use". The ear shells can not be adjusted actively to the size of your head, but they are fitted to a double arc of sturdy metal wire, with a silicone strap stretched transversely between them to rest on your head. The elasticity of this strap allows for adaptation to the size of your head. The metal arc makes the ear shells clamp to your head tightly, but not too tight, which is not only important for comfort of wearing, but also for making the ear pads seal to your head properly for optimal isolation. I have not tested it with other people and am not sure how it will fit on XS or XL sized heads...
On the bottom side of the left ear shell, there is an "appendix" of about 5cm of cable fitted with a 3,5mm stereo jack. This inserts into a 3m extension cable with 3,5mm stereo connectors on both terminals (female-male). To me this appears somewhat unusual: in other models with detachable cord, the cable had male connectors on both terminals, and a female receptacle in one or both ear shells. The connection between "appendix" and extension cable is tight though, minimising the risk of getting disconnected in the middle of the performance of your life, just as is the connection between the extension cord jack and the 3,5-to-6,3mm adapter jack supplied with the HD-665.
As it seems to be designed for drummers especially, the HD-665 sounds a little "boomy" when no tone adjustment is made. By turning down bass a little, and maybe turning up a little treble to your taste, it produces a sound that is pretty much useful for listening to all kinds of content, including monitoring your recorded tracks.
-good isolation (best of the models I tested)
-fair sound quality, especially after some tone adjustment
And then its price: fair and decent compared to what you get (and much cheaper than the DT-770, as I aimed for!)
All together, this set of cans meets my requirements best! I am keeping it, and order a few more to be able to serve a complete band on a recording session in my one room studio!
BTW: I also compared the HD-665 to Alesis' DRP-100 (not in Thomann's product line and hard to find in stock elsewhere at the time of writing). Except for some minor brand specific differences in appearance, they are fully identical when it comes to build quality, sound, functionality and price, despite spec sheets showing some differences in freq.range and impedance a.o. So if you do not care for the blue (non-detachable) cable of the DRP-100, then the HD-665 is a totally equal choice!