The Koss Porta Pro ranks #126 out of 134 total Over-Ear Headphones for sound quality. See all Headphones rankings for every top pick.
Brand: Koss
Prices on this page were last checked October 10, 2026 at 5:37 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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#126 Koss Porta Pro: $32.99 Amazon eBay
Pros: A very cheap, lightweight open-back design dating from 1984. At 60 ohms and 101 dB sensitivity it runs easily from a phone. The warm tilt and a mild 2.6 dB bass lift suit listeners who like a relaxed, bassy sound.
Cons: A 16.8 dB dip near 3.6 kHz hollows out vocals and instrument detail, and treble from 6 to 10 kHz is about 6 dB low. Sub-bass below 60 Hz sits about 6 dB under target. The open back leaks sound and provides no isolation, and the HyperX Cloud Alpha is rated clearly higher at a similar price.
| Released | 1984 (42 years ago) |
|---|---|
| Back | Open |
| Connection | Wired |
| Deviation From Target | 3.55 dB standard deviation |
| Driver Type | Dynamic |
| Form Factor | Over-ear |
| Frequency Response | 15Hz - 25kHz (Manufacturer specified) |
| Harman Preference Score | 46 (measured by oratory1990, via AutoEQ) |
| Impedance | 60 ohms |
| Sensitivity | 101 dB SPL/1mW |
| Tonal Tilt | -1.50 (negative is warmer, positive brighter) |
EQ preset to match the Harman target
Set a preamp of -7.9 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by AutoEQ from its measured frequency response.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +9.2 dB | 0.70 |
| Peak | 83 Hz | -8.7 dB | 0.47 |
| Peak | 3,336 Hz | +4.3 dB | 4.55 |
| Peak | 8,898 Hz | +5.8 dB | 2.75 |
| Peak | 6,711 Hz | +4.5 dB | 4.32 |
| High shelf | 10,000 Hz | +4.5 dB | 0.70 |
| Peak | 4,725 Hz | -3.8 dB | 6.00 |
| Peak | 1,892 Hz | -1.6 dB | 2.53 |
| Peak | 658 Hz | +0.6 dB | 1.45 |
| Peak | 2,756 Hz | +1.5 dB | 4.62 |
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