Koss KSC75 vs Koss Porta Pro

Short answer: the Koss KSC75, though neither ranks well in its class. It ranks #116 of 134 over-ear headphones by sound quality, rated 2.8/5, at $19.99; the Koss Porta Pro ranks #126, rated 2.4/5, and costs $32.99, so there is not much of a tradeoff to weigh. Both are rated below 3.0/5 among the 134 over-ear headphones, and the Koss KPH30i, ranked #67 at $23.99, is a better place to start if sound quality matters.

The Koss KSC75 is the better-sounding choice. An extremely low cost and a featherweight 0.1 lbs (43 g) clip-on design make it easy to carry and wear for long stretches. The catch: Sub-bass is about 17 dB below target under 60 Hz, so there is almost no rumble and bass-heavy music sounds thin.

The case for the Koss Porta Pro: A very cheap, lightweight open-back design dating from 1984. The catch: 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.

Buy the Koss KSC75. It is rated higher for sound quality than the Koss Porta Pro and costs less, which makes it the one to get unless you need something the other one does better.

Looking for alternatives? See the complete Headphones rankings.

Specifications Side By Side

Related Headphone Comparisons

How Koss KSC75 compares with other leading options:

• Koss KPH30i vs Koss KSC75
• Koss KPH40 vs Koss KSC75
• Koss KPH40 vs Koss Porta Pro
• Koss Porta Pro vs Razer BlackShark V2 X
• Koss KPH30i vs Koss KPH40

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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The Two Headphones In Full

Koss KSC75: $19.99 Amazon eBay

Pros: An extremely low cost and a featherweight 43 g clip-on design make it easy to carry and wear for long stretches. The midrange is close to target, with the low mids within 0.2 dB, so voices sound natural, and the slightly lifted treble of about 2 to 3 dB adds clarity. The open back gives an airy sound, and 101 dB sensitivity at 60 ohms works from a phone.

Cons: Sub-bass is about 17 dB below target under 60 Hz, so there is almost no rumble and bass-heavy music sounds thin. Bass in the 60 to 200 Hz range is also about 2 dB low, and a 4 dB peak near 5.3 kHz can add some edge. The open design leaks sound and gives no noise isolation.

Full Koss KSC75 review and specifications →

Back	Open
Connection	Wired
Deviation From Target	3.33 dB standard deviation
Driver Type	Dynamic
Drivers	1 x 35mm dynamic
Form Factor	Over-ear
Frequency Response	15Hz - 25kHz (Manufacturer specified)
Harman Preference Score	54 (measured by oratory1990, via AutoEQ)
Impedance	60 ohms
Sensitivity	101 dB SPL/1mW
Tonal Tilt	+1.22 (negative is warmer, positive brighter)
Weight	0.1 lbs (43 g)

EQ preset to match the Harman target

Set a preamp of -6.3 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	+6.2 dB	0.70
Peak	610 Hz	+2.2 dB	0.63
Peak	2,358 Hz	-3.4 dB	1.92
Peak	169 Hz	-2.3 dB	0.77
Peak	74 Hz	+2.0 dB	2.94
High shelf	10,000 Hz	-3.0 dB	0.70
Peak	4,033 Hz	+3.3 dB	5.88
Peak	5,191 Hz	-3.4 dB	5.53
Peak	7,220 Hz	-1.5 dB	2.25
Peak	4,517 Hz	+0.7 dB	4.34

• Reviews, Comparisons and Sound Samples
  • AutoEQ results for the Koss KSC75 (oratory1990 measurement)
• Head-to-Head Comparisons
  • Koss KSC75 vs Koss KPH40
  • Koss KSC75 vs Koss KPH30i

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.

Full Koss Porta Pro review and specifications →

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

• Reviews, Comparisons and Sound Samples
  • AutoEQ results for the Koss Porta Pro (oratory1990 measurement)
• Head-to-Head Comparisons
  • Koss Porta Pro vs Razer BlackShark V2 X
  • Koss Porta Pro vs Koss KPH40