Overview

Ultrasone Signature Pure is a budget closed-back, wired headphone positioned beneath the brand’s studio-oriented Signature models. It features 50 mm dynamic drivers, Double Deflector Fins (DDF), and the company’s S-Logic 3 acoustic scheme. Street price is 169 USD. [5][4]

Scientific Validity

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As of August 25, 2025, no independent lab measurements (FR/THD/IMD/Isolation) for Signature Pure could be located. Per policy we start from 0.5 when measured performance is unknown and adjust only on facts. Catalog information confirms 50 mm drivers and S-Logic 3; one official reseller lists a wideband frequency range beyond 20 kHz, but this alone does not establish audibility or transparency. Therefore the score remains a neutral 0.5 pending third-party data. [5]

Technology Level

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Proprietary S-Logic 3 driver/earcup geometry and DDF are technically distinctive beyond a basic closed-back design. Construction is fold-flat with practical studio ergonomics. These are incremental—rather than breakthrough—advances, earning 0.6. [5][4]

Cost-Performance

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Comparator (cheapest equal-or-better): AKG K361 — 135 USD.
Why equivalent-or-better: closed-back, wired headphones with comparable functionality; independent measurements show a balanced response close to target and low distortion, i.e., at least on par in core metrics versus the unmeasured Signature Pure. [1][2]

Calculation (USD basis):
CP = 135 USD ÷ 169 USD = 0.7976… → 0.8 (rounded to 1 decimal).
References: K361 price from a current US retailer; K361 measurements from Rtings. [2][1]

Reliability & Support

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We did not find a clearly published, global warranty statement for Signature Pure on an official spec page. Build appears conventional for the class (foldable closed-back, detachable cable). Absent broad failure data or a verified warranty policy, we keep this at an average 0.5.

Rationality of Design Philosophy

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Ultrasone emphasizes S-Logic spatial cues—an acoustic presentation preference—rather than explicitly pursuing transparency benchmarks. That design direction is not inherently harmful, but it prioritizes a particular listening experience over measurement-first neutrality, so 0.4. [6]

Advice

If you want the best objective value in this price band, start with AKG K361 (135 USD) for closer-to-target tonality and measured low distortion. If you can spend slightly more and want an even more target-aligned option, consider AKG K371. Keep Signature Pure on your list if you specifically want a bass-forward presentation and S-Logic staging. [1][3]

References

[1] Rtings, “AKG K361 Headphones Review,” https://www.rtings.com/headphones/reviews/akg/k361 , accessed Aug 25, 2025 (independent measurements: FR/THD/Isolation).

[2] CDW, “AKG K361 – headphones,” https://www.cdw.com/product/akg-k361-headphones/5895444 , accessed Aug 25, 2025 (price 135 USD).

[3] Rtings, “AKG K371 Headphones Review,” https://www.rtings.com/headphones/reviews/akg/k371 , accessed Aug 25, 2025.

[4] Audiophile-Heaven, “Ultrasone Signature Pure Dynamic Headphones – New Edition Of Mighty Bass,” https://www.audiophile-heaven.com/2023/06/ultrasone-signature-pure-dynamic-headphones-new-edition-of-mighty-bass.html , accessed Aug 25, 2025 (feature overview; not used for measurements).

[5] MUZIX (reseller product page), “ULTRASONE SIGNATURE PURE – Over-ear Closed-back Wired Reference Headphones with S-Logic 3,” https://www.muzix.eu/us/Ultrasone/Headphones/On-ear/USO-SIGNATURE-PURE/ULTRASONE-SIGNATURE-PURE-Over-ear-Closed-back-Wired-Reference-Headphones-with-S-Logic-3 , accessed Aug 25, 2025 (official specs listing: S-Logic 3, FR band).

[6] Wikipedia, “Ultrasone,” https://en.wikipedia.org/wiki/Ultrasone , accessed Aug 25, 2025 (background on S-Logic concept; secondary source).

(2025.8.25)