PreSonus HD9chat_bubble_outlineFrom real comments

Sound is bass-heavy, which splits opinion. Multiple commenters describe the HD9 as having too much bass or 'crazy bass', with one calling it powerful even on a basic desktop setup. Others frame this positively, saying they love deep, rich sound and find the HD9 worth it at $80. However, a vocal minority say the headphones lack highs and definition, sounding muddy, muffled, or like a 'thick wool blanket', unfavorably comparing them to the Audio-Technica ATH-M50x they appear to imitate.

Comfort and build draw mixed but detailed feedback. Several users highlight comfort as a standout trait, including fitting well with glasses and being kind to ears during long sessions. One reviewer specifically praised the HD9 as comfy and accurate for professional mixing and tracking work over a year. However, others report the HD7 variant's headband is thin, cheaply constructed plastic that breaks too soon, and one buyer wished for a removable coiled cable like on competing models.

Reliability concerns emerged after months to years of use. One buyer reported a side dying after only a few months of light use, just past the warranty window, calling it unimpressive. Another said ear cup coverings began flaking off after about two years, criticizing the craftsmanship. A third had trouble finding replacement ear pads after roughly three years of ownership, comparing the design to the ATH-M50x for possible compatible parts.