In Short: To understand headphone specs, check the driver size (bigger can mean more bass), impedance (under 32Ω for phones), frequency response (20Hz–20kHz covers full human hearing), and sensitivity (above 95 dB/mW for portable use). These four numbers together tell you how a headphone will sound with your device.
The Full Explanation
Walking into a headphone listing and seeing numbers like "40mm driver, 32Ω, 20Hz–20kHz, 108 dB/mW" can feel like reading a technical manual. But once you know what each number means, you can make a smarter buying decision without having to rely purely on marketing language or YouTube reviews.
Driver Size: Think of the driver as a tiny loudspeaker sitting inside each ear cup. When an electrical signal from your phone or laptop enters the headphone, the driver vibrates to push air and create sound waves your ear picks up. Driver size is measured in millimetres. Most consumer headphones use 30mm to 50mm drivers. A 40mm driver is standard for over-ear headphones, while earphones use much smaller 6mm to 14mm drivers. Larger drivers can physically move more air, which often translates to deeper, more impactful bass — but only if the driver is well-tuned. A poorly tuned 50mm driver will still sound worse than a quality-tuned 40mm one.
Impedance: Impedance is measured in ohms (Ω) and represents the electrical resistance of the headphone. Low-impedance headphones (16–32Ω) are designed to work efficiently with weak output sources like smartphones, tablets, and laptops that are extremely common in India. High-impedance headphones (150Ω–600Ω) were developed for professional studio use where dedicated amplifiers are always available. Plugging a 250Ω headphone into your phone will give you low volume and muddy sound. For everyday Indian buyers — students, office workers, commuters — anything between 16Ω and 50Ω is ideal.
Frequency Response: This tells you the range of sounds the headphone can reproduce. Human ears hear from about 20Hz (deep bass, like a subwoofer thud) to 20,000Hz (high treble, like a cymbal shimmer). Any headphone rated 20Hz–20kHz covers everything you can hear. Some brands advertise wider ranges like 5Hz–40kHz, which sounds impressive but refers to sounds outside normal human hearing. Focus instead on how flat or V-shaped the frequency response is — flat means accurate, V-shaped means boosted bass and treble, which many casual listeners prefer.
Sensitivity: Sensitivity measures how loud a headphone gets per milliwatt of power (dB/mW). In noisy environments like Delhi Metro or a Chandigarh marketplace, you need headphones that get loud enough from a phone's limited output. Aim for sensitivity above 95 dB/mW for portable use. Very sensitive headphones (above 110 dB/mW) can sometimes pick up background hiss from weak audio circuits.
Key Specifications at a Glance
| Spec | What It Measures | Ideal Range for Phone Use | Watch Out For |
|---|---|---|---|
| Driver Size | Physical size of speaker element | 30mm–50mm (over-ear) | Big driver ≠ automatically better sound |
| Impedance | Electrical resistance (Ω) | 16Ω – 50Ω | High ohm headphones need an amp |
| Frequency Response | Sound range in Hz | 20Hz – 20,000Hz minimum | Ultra-wide ranges can be marketing fluff |
| Sensitivity | Loudness per milliwatt (dB/mW) | 95 dB/mW and above | Very high sensitivity may expose hiss |
| Total Harmonic Distortion | Sound accuracy at high volume (%) | Below 1% THD | High THD means distorted loud sound |
Who Should Get This?
- The Daily Commuter (Metro/Bus in Chandigarh or any Indian city): You need headphones with low impedance (16–32Ω) so they get loud from your phone, plus good passive isolation or ANC to block traffic noise. Look for over-ear or in-ear options with a sensitivity above 100 dB/mW. Budget: ₹1,500 – ₹5,000. A V-shaped frequency response (boosted bass and treble) works well for masking ambient noise.
- The Work-From-Home Professional or Student: You want clear mids for voice calls and video meetings, and comfortable over-ear pads for long sessions. Flat or neutral frequency response with a 40mm+ driver and impedance around 32Ω is ideal. Built-in microphone quality matters more than bass punch here. Budget: ₹3,000 – ₹10,000.
- The Music Enthusiast or Audiophile: You care deeply about accuracy and detail. Look for a flat frequency response, low THD (under 0.5%), and if you are willing to invest in a DAC-amp, consider higher impedance options (80–150Ω) for cleaner output. Open-back designs offer better soundstage. Budget: ₹8,000 – ₹25,000+.
Best Options Available in India (2026)
- boAt Rockerz 550 (₹1,299 – ₹1,799): Features a 50mm driver, 32Ω impedance, and 20Hz–20kHz response — a solid entry-level over-ear headphone for commuters and students who want impactful bass without spending much. Available at iTechArena.
- JBL Tune 770NC (₹3,999 – ₹5,499): Offers Active Noise Cancellation, 40mm drivers, and a 20Hz–20kHz frequency range with adaptive ANC tuning — ideal for the daily commuter or WFH professional who needs call clarity and noise isolation. Available at iTechArena.
- Sony WH-1000XM6 (₹26,990 – ₹29,990): Sony's flagship ANC headphone features industry-leading noise cancellation, a 30Hz–40kHz frequency response, and 48Ω impedance — the benchmark choice for audiophiles and frequent flyers who demand the best. Available at iTechArena.
- Samsung Galaxy Buds3 Pro (₹14,999 – ₹16,999): True wireless earbuds with a dual-driver setup (11mm woofer + 6.1mm tweeter), 20Hz–24kHz response, and intelligent ANC — perfect for Samsung Galaxy phone users who want seamless integration and studio-quality sound on the go. Available at iTechArena.
Frequently Asked Questions
What does driver size mean in headphones?
The driver is a small speaker inside each ear cup that converts electrical signals into sound. Larger drivers (40mm–50mm) generally move more air and can produce stronger bass, but driver size alone does not determine overall sound quality. Tuning and build quality matter just as much.
What is impedance in headphones and why does it matter?
Impedance, measured in ohms (Ω), indicates how much electrical resistance the headphones present to your audio source. Low-impedance headphones (16–32Ω) work well with smartphones and laptops, while high-impedance models (150Ω+) need a dedicated amplifier to reach their full potential. For most Indian buyers using phones, stick to headphones under 50Ω.
What is a good frequency response range for headphones?
Frequency response shows the range of sound a headphone can reproduce, measured in Hertz (Hz). Human hearing spans roughly 20Hz to 20,000Hz, so headphones rated 20Hz–20kHz cover the full audible spectrum. A wider stated range like 5Hz–40kHz can indicate quality drivers but does not always guarantee better audible sound.
Is higher sensitivity better in headphones?
Sensitivity, measured in decibels per milliwatt (dB/mW), tells you how loud headphones get for a given power input. Higher sensitivity (above 100 dB/mW) means louder output from low-power devices like phones. For portable use in noisy Indian environments like metro trains or markets, aim for sensitivity above 95 dB/mW.
Can I use high-impedance headphones with my phone?
You can plug high-impedance headphones (over 100Ω) into a phone, but they will sound quiet and thin because phones lack the amplification power needed. To get proper volume and bass, you would need a portable headphone amplifier or a DAC-amp combo. For phone-only use, choose headphones rated between 16Ω and 32Ω.
Shop at iTechArena
Every headphone listed above is available at iTechArena — SCO-1072-73, Sector 22B, Chandigarh. We stock genuine products, provide GST invoices, and offer free delivery pan-India. Not sure which spec matters most for your use case? WhatsApp us at +91 9023252627 for personalised advice before you buy. You can also browse our full headphone collection at itecharena.com.