Stax SR-Lambda Pro Classic Review: Ranked #234 of 479

Last updated: October 16, 2026

The Stax SR-Lambda Pro Classic ranks #234 out of 479 total Over-Ear Headphones for sound quality. See all Headphones rankings for every top pick.

Brand: Stax

Prices on this page were last checked October 16, 2026 at 5:46 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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Stax SR-Lambda Pro Classic - ranked #234 of 479 Over-Ear Headphones · Editor's rating 3.6/5

#234 Stax SR-Lambda Pro Classic: $550 Discontinued eBay

Pros: A broadly balanced tuning with a preference score of 72 against the Harman target.

Cons: About 6 dB less bass than the Harman target below 150 Hz, which can sound thin on pop, hip hop and electronic music. Treble about 3 dB below target from 3 to 10 kHz, which can sound dull or veiled next to brighter headphones. Discontinued.

Is the Stax SR-Lambda Pro Classic right for you?

Buy it if

  • your taste runs neutral: it scores 92 for that sound.
  • you are sensitive to bright or sharp treble (treble sits 2.7 dB below target).
  • you are happy to use EQ: our preset lifts its Harman match by about 26 points.

Skip it if

  • you want more bass (about 6 dB below target).
  • you need isolation or will use it in public: open-back headphones leak sound both ways.
  • you want to buy it new: it is discontinued.
BackOpen
ConnectionWired (Stax Pro bias 580V 5-pin)
Deviation From Target2.44 dB standard deviation
Driver TypeElectrostatic
Drivers1 Electrostatic push-pull
Form FactorOver-ear
Harman Preference Score72 (measured by oratory1990, via AutoEQ)
Sub-bass ExtensionWithin 6 dB of target down to 20 Hz (-5.4 dB at 30 Hz)
Tonal Tilt+0.74 (negative is warmer, positive brighter)

EQ Presets

Harman target

Set a preamp of -5.6 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. Predicted Harman match with this EQ: 98 out of 100, up from 72.

FilterFrequencyGainQ
Low shelf105 Hz+5.6 dB0.70
Peak1,814 Hz-4.8 dB1.42
Peak4,453 Hz+3.6 dB1.32
Peak5,890 Hz-4.6 dB5.74
Peak396 Hz+1.0 dB2.02
High shelf10,000 Hz-4.7 dB0.70
Peak223 Hz-0.6 dB3.80
Peak648 Hz+0.3 dB2.64
Peak275 Hz+0.4 dB3.91
Peak1,100 Hz-0.5 dB5.62

Neutral target

Set a preamp of -4.8 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by Speaker Ranking from AutoEQ’s measurement, in the filter layout AutoEQ uses. Predicted Neutral match with this EQ: 97 out of 100, up from 92.

FilterFrequencyGainQ
Low shelf105 Hz+1.2 dB0.70
High shelf10,000 Hz-3.1 dB0.70
Peak373 Hz+2.3 dB0.66
Peak1,296 Hz-0.9 dB2.38
Peak1,822 Hz-3.6 dB3.46
Peak3,233 Hz+1.5 dB6.00
Peak4,358 Hz+4.8 dB2.50
Peak5,894 Hz-1.6 dB6.00
Peak7,540 Hz+2.0 dB5.65

Studio flat target

Set a preamp of -5.4 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by Speaker Ranking from AutoEQ’s measurement, in the filter layout AutoEQ uses. Predicted Studio flat match with this EQ: 90 out of 100, up from 70.

FilterFrequencyGainQ
Low shelf105 Hz-0.7 dB0.70
High shelf10,000 Hz+2.0 dB0.70
Peak198 Hz-0.7 dB2.47
Peak598 Hz+1.0 dB1.88
Peak1,629 Hz-2.1 dB3.19
Peak2,728 Hz+2.2 dB6.00
Peak3,893 Hz+5.3 dB1.50
Peak5,913 Hz-2.3 dB6.00

Warm target

Set a preamp of -6.1 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by Speaker Ranking from AutoEQ’s measurement, in the filter layout AutoEQ uses. Predicted Warm match with this EQ: 100 out of 100, up from 59.

FilterFrequencyGainQ
Low shelf105 Hz+6.0 dB0.70
High shelf10,000 Hz-6.0 dB0.70
Peak373 Hz+2.4 dB0.47
Peak1,412 Hz-1.3 dB2.04
Peak1,848 Hz-4.1 dB3.46
Peak4,294 Hz+3.0 dB3.93
Peak5,952 Hz-2.7 dB6.00

Bass 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 Speaker Ranking from AutoEQ’s measurement, in the filter layout AutoEQ uses. Predicted Bass match with this EQ: 91 out of 100, up from 53.

FilterFrequencyGainQ
Low shelf105 Hz+6.0 dB0.70
High shelf10,000 Hz-3.2 dB0.70
Peak49 Hz-1.1 dB1.30
Peak124 Hz+2.3 dB0.42
Peak470 Hz+1.6 dB1.29
Peak1,812 Hz-3.6 dB3.20
Peak3,219 Hz+1.5 dB5.68
Peak4,359 Hz+4.8 dB2.49
Peak5,896 Hz-1.6 dB6.00
Peak7,544 Hz+2.0 dB5.44

Bright target

Set a preamp of -6.2 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by Speaker Ranking from AutoEQ’s measurement, in the filter layout AutoEQ uses. Predicted Bright match with this EQ: 84 out of 100, up from 72.

FilterFrequencyGainQ
Low shelf105 Hz+1.1 dB0.70
Peak373 Hz+2.2 dB0.66
Peak1,817 Hz-3.7 dB3.40
Peak3,311 Hz+1.5 dB4.83
Peak4,489 Hz+6.0 dB1.72

V-shaped target

Set a preamp of -7.3 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by Speaker Ranking from AutoEQ’s measurement, in the filter layout AutoEQ uses. Predicted V-shaped match with this EQ: 84 out of 100, up from 56.

FilterFrequencyGainQ
Low shelf105 Hz+6.0 dB0.70
High shelf10,000 Hz+0.5 dB0.70
Peak141 Hz+3.4 dB0.49
Peak423 Hz+1.9 dB1.54
Peak1,758 Hz-3.5 dB2.96
Peak3,276 Hz+1.7 dB3.82
Peak4,463 Hz+6.0 dB1.50
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