#1
Audio-Technica ATH-M50x
Closed-Back Studio Headphone · Over-ear, 15Hz–28kHz, professional-grade, folding design, 38 Ohm$90–$130 usedBest for: Professional studio monitoring, mixing, mastering, portable professional work
Audio-Technica ATH-M50x ($90–$130 used) is the professional studio standard — flat frequency response, extended high-end (28kHz), closed-back isolation, folding design for travel, and legendary durability. Retail $150–$170, so used finds at $90–$130 are common. Industry standard for mixing engineers, mastering, and broadcast work.
What to check used: Flat response means no bass boost like consumer headphones — may sound thin if used to consumer tuning. Closed-back can feel congested in untreated rooms. Folding design adds moving parts; can loosen after heavy use.
#2
Beyerdynamic DT 770 Pro
Closed-Back Studio Headphone · Over-ear, 5Hz–35kHz, professional, 80 Ohm impedance option, presence peak$100–$145 usedBest for: Professional monitoring, music production, detailed listening
Beyerdynamic DT 770 Pro ($100–$145 used) is the German studio standard — extended frequency response (5Hz–35kHz), presence peak for clarity, closed-back isolation, and Beyerdynamic's rugged construction. Retail $150–$180 new. Available in 80 Ohm (professional), 250 Ohm (home), or 32 Ohm (portable) — check impedance when buying used.
What to check used: Presence peak can cause fatigue during long mixing sessions — use in short bursts. 80 Ohm version requires more preamp gain than 32 Ohm. Closed-back can feel stiffer than open-back designs.
#3
Sennheiser HD 600
Open-Back Audiophile Headphone · Over-ear, 12Hz–40kHz, legendary open-back, neutral tonality, 300 Ohm$160–$210 usedBest for: Audiophile listening, critical music listening at home, detailed mastering
Sennheiser HD 600 ($160–$210 used) is the legendary open-back audiophile standard — neutral, detailed, wide soundstage, and built for listening comfort. Retails $380–$400 new; used finds at $160–$210 are steals. Open-back design leaks sound (not for offices) but delivers unmatched soundstage. Every audiophile owns (or has owned) an HD 600.
What to check used: Open-back leaks sound — not suitable for offices or shared spaces. 300 Ohm impedance requires a headphone amp or interface with sufficient preamp gain. Neutral tonality means no bass boost — pair with slight subwoofer if bass is lacking.
#4
AKG K702
Open-Back Audiophile Headphone · Over-ear, 10Hz–39.8kHz, open-back, wide soundstage, 62 Ohm$100–$150 usedBest for: Audiophile listening, orchestral/acoustic music, home listening
AKG K702 ($100–$150 used) is the affordable open-back alternative — wide soundstage, neutral tone, and exceptional clarity for orchestral and acoustic music. Retail $250–$300 new. Open-back design makes them comfortable for long listening sessions. Lower impedance (62 Ohm vs 300 Ohm) than HD 600 — easier to drive with consumer interfaces.
What to check used: Open-back leaks sound — not for offices or shared spaces. Soundstage is the strength; mixing bass-heavy music may reveal bottom-end limitations. 62 Ohm still requires reasonable preamp gain.
#5
Beyerdynamic DT 990 Pro
Open-Back Studio Headphone · Over-ear, 5Hz–35kHz, open-back, presence peak, available in 80/250 Ohm$90–$130 usedBest for: Studio monitoring (open-back), critical listening, detailed mastering
Beyerdynamic DT 990 Pro ($90–$130 used) is the open-back studio version — presence peak, extended frequency range (5Hz–35kHz), wide soundstage, and Beyerdynamic durability. Retail $150–$180 new. Open-back gives more soundstage than DT 770 Pro (closed-back). Available in 80 Ohm (professional) or 250 Ohm (home).
What to check used: Presence peak requires careful EQ to avoid fatigue. Open-back leaks sound — not suitable for offices. Impedance varies; check if it is 80 Ohm (needs more gain) or 250 Ohm (consumer-friendly).
#6
Sennheiser HD 660 S
Open-Back Audiophile Headphone · Over-ear, 10Hz–41kHz, upgraded HD 600 successor, neutral, 300 Ohm$220–$290 usedBest for: Audiophile listening, mastering, detailed home listening
Sennheiser HD 660 S ($220–$290 used) is the HD 600 successor — slightly improved clarity and midrange, same neutral tonality, same 300 Ohm impedance. Retail $500 new; used finds at $220–$290 are better value than original HD 600 now. Open-back audiophile standard for detailed listening.
What to check used: Open-back leaks sound — office-unfriendly. 300 Ohm impedance requires headphone amp. Less common on secondhand market than HD 600 (fewer units sold) — may take time to find.
#7
Focal Listen Professional
Closed-Back Studio Headphone · Over-ear, 20Hz–20kHz, French Focal voicing, professional build, 32 Ohm$120–$170 usedBest for: Professional studio monitoring, music production, mixing
Focal Listen Professional ($120–$170 used) is the French studio option — closed-back, slightly warm Focal voicing, professional build, and good isolation. Retail $250 new; used finds are uncommon but sought-after. French engineering brings different flavor to monitoring than German (Beyerdynamic) or Japanese (Audio-Technica) designs.
What to check used: Warm voicing means slightly less neutral than flat monitors — requires EQ awareness. Closed-back can feel congested. Focal is less common than Audio-Technica or Beyerdynamic — takes time to find used.