These models have a similar sound character and are perfect for mixing and arranging. They are particularly suitable for working with "live" music and acoustic musical instruments in conjunction with Realphones
correction and emulation.
The HD 600
is the most "natural" of the three, but details are less audible than in the other models.
The HD 660S
has a more exciting and velvety sound and is better in detail than the other models.
The HD 650
is somewhere in between the HD 660S
and HD 600
. They sound "natural" enough, but detail is not sacrificed as with the HD 600
All three models are definitely worth considering. Yes, the 600s
were released more than 20 years ago. Yes, the 660S
is the freshest model where mistakes were fixed. Yes, the 650s
can be considered a "golden mean" in some sense. Overall, all three models have high sound quality and are intended for professional music work. However, each model has its own characteristics that should be taken into account when choosing. If you prefer a more neutral and uncolored sound, the HD 600
is a good choice. If you are looking for more versatile headphones with deeper bass, then the HD 650
will suit you. And if you want a more transparent and detailed sound, as well as a deeper and wider soundstage, then the HD 660S
is the right choice. Each model with Realphones
will help you make the right decisions during mixing.