Musical is an admittedly slippery word — after all, isn't every sound musical to some degree? — but in audiophile-speak it carries a specific meaning. To call a DAC or a headphone musical is to say it connects you to the music emotionally. It prioritizes enjoyment and natural, pleasant tonality over raw analytical detail. It's the kind of sound that makes you tap your foot and get lost in a song rather than dissect it.
The Headphonesty glossary defines it neatly as cohesive reproduction that sounds natural, realistic, and right to the listener. In practice, a musical sound tends to share a few traits: good tonality, so instruments sound like themselves with natural timbre and nothing weird sticking out; smoothness where it counts, perhaps a gentle roll-off in the extreme treble to avoid stridency or a touch of warmth for body; engaging dynamics, the rhythm and timing some call PRaT, that give music life and a toe-tap factor; and cohesion, the frequencies blending so well you hear the whole song as one integrated piece.
Imagine certified organic tone, well-described note bursts, and furious foot-tapping momentum.Herb Reichert, Stereophile
Think of musical gear as the kind that makes you forget about the gear. You catch yourself humming along, even moved, rather than thinking how great the detail on that hi-hat is — that latter mindset is analytical listening, and musical sits squarely opposite it. You'll see the sentiment all over the forums: I know these may not be the most resolving headphones, but they're so musical I keep coming back just to enjoy my music. Extreme detail retrieval takes a back seat to overall enjoyment, and many audiophiles will tell you that enjoying music is the whole point.
A couple of misconceptions are worth clearing up. Musical doesn't have to mean inaccurate — it's often a subtly colored kind of accuracy, and at the very top end some gear manages to be both extremely resolving and highly musical at once. It isn't either-or up there. Lower down, though, you often do choose between an analytical tuning and a musical one. A musical headphone might soften the harshness in a recording and add a little warmth — technically coloration, but subjectively lovely.
Nor does musical simply mean bass-heavy fun. A big V-shaped signature can be musical, sure, but so can a fairly neutral one, as long as it engages you. It leans toward smooth, coherent, maybe warm-ish, with good rhythm, and it tends to avoid extremes — not too bright, not too bass-light or clinical. It's personal, too: what one listener finds musical, another craving more excitement might find dull.
So calling something musical is praise for the intangibles. Rather than isolating bass or treble, it says the overall effect was pleasing — the reviewer found themselves enjoying the music, maybe more than expected. Its opposites are analytical, clinical, sterile, and dry: technically sharp, perhaps, but not emotionally involving. If you aren't chasing the last sliver of detail and just want every song to sound good and your foot to start tapping, the words to hunt for are musical, warm, and smooth.