Does the Topping DX3 Pro+ drive the Koss Porta Pro?

Computed from measured specifications · target SPL 110 dB · load 32 Ω

Ample

The Topping DX3 Pro+ drives the Koss Porta Pro with ample headroom (~28.2 dB headroom at 32 ohms; needs ~2.8 mW, delivers 1800 mW).

Headroom
28.2 dB
Required (110 dB SPL)
2.8 mW
Delivered (@ 32 Ω)
1800 mW
Required voltage
0.45 Vrms

Power Headroom

Headroom: 28.2 dB 0 · target 28.2 dB below target marginal adequate ample -14 dB +10 +20 +36 dB

Scale shows dB headroom above the 2.8 mW required to reach 110 dB SPL. Amp delivers 1800 mW at 32 Ω (+28.2 dB above target).

Koss Porta Pro Dynamic · on-ear
Impedance (rated) 60 Ω
Impedance (measured) Source: reference-audio-analyzer.pro/en/r… 72.15 Ω measured
Sensitivity (rated) 101.0 dB/mW
Sensitivity (measured) 105.6 dB/mW measured
Driver Dynamic
Spec basis Measured
Measured by Reference Audio Analyzer (https://reference-audio-analyzer.pro/en/report/hp/koss-porta-pro.php) · Source ↗
Topping DX3 Pro+ Dac Amp · Single Ended
Output impedance manufacturer 0.1 Ω
Power @ 32 Ω 1800 mW
Power @ 300 Ω 250 mW
Power @ 600 Ω 125 mW *est.
Power source Manufacturer
* Loads marked "est." are derived from the published voltage ceiling at a lower-impedance load (V = √(P·R) → P_higher = V²/R_higher). All derivations are upward only.
Topping DX3 Pro+ SE headphone output: 1800 mW @ 32 Ω, 250 mW @ 300 Ω (from Topping official spec). Output impedance <0.1 Ω. 600 Ω derived from 300 Ω. · Source ↗

Where to buy

Topping DX3 Pro+ on Amazon ↗ Koss Porta Pro on Amazon ↗

Disclosure: links above are Amazon affiliate links. As an Amazon Associate this site earns from qualifying purchases — at no extra cost to you. Affiliate commissions do not influence verdicts; all analysis is computed independently from the data.

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