Overview

The Audio-Technica AT-701 is an open-back, circumaural, passive wired dynamic headphone released in 1974 as part of the AT-700 series, Audio-Technica’s first headphone family and the company’s expansion beyond phono cartridges [1]. It uses a single full-range moving-coil dynamic driver per side, an open-back grilled cup, a fixed coiled cable terminated in a 6.35 mm plug, and plastic cups with metal yoke and rails [2]. The model has been discontinued for decades and is not in Audio-Technica’s current product index; it is available only on the secondhand market at roughly 35 USD [2][3].

Scientific Validity

Manufacturer specifications recorded on the unit indicate frequency response of 30 Hz – 20,000 Hz (no ±dB tolerance specified) and impedance of 4–16 Ω [2]. Comprehensive third-party measurement data is unavailable for this 1974 model, so the available information is insufficient to position the product against measurement-based audibility criteria, and the score reflects this lack of verifiable performance evidence.

Technology Level

The AT-701 is built on era-standard, commodity-grade technology: a conventional moving-coil dynamic driver, an open-back enclosure (a topology already established by the Sennheiser HD414 in 1968), a low-impedance voice coil for direct drive from period receiver headphone jacks, and a fixed coiled cable with a 6.35 mm plug [1][2]. Audio-Technica designed the model in-house, leveraging cartridge-engineering know-how, but no proprietary or patented technology specific to the AT-701 is documented. The implementation is purely analog and mechanical with no DSP, software, or digital integration; the topology is now thoroughly outdated and trivially replicable, with no element a current competitor would seek to license. This evaluation is independent of measured fidelity and addresses only technological sophistication and originality.

Cost-Performance

This site evaluates based solely on functionality and measured performance values, without considering driver types or configurations.

The review target’s current secondhand market price is approximately 35 USD [3]. The cheapest currently-available wired passive stereo headphone with equivalent-or-better user-facing functions (wired stereo playback, stereo L/R output; minor 3.5 mm vs 6.35 mm plug gap normalizable by an inexpensive adapter) and equivalent-or-better documented audio specifications is the Koss KSC75 at 18 USD [4].

Numeric performance comparison (Koss KSC75 vs Audio-Technica AT-701):

• Frequency Response (manufacturer range): 15–25,000 Hz vs 30–20,000 Hz — comparison wider on both ends [4]
• THD (manufacturer): <0.2% @ 1 kHz vs not specified — comparison publishes a value, target does not [4]
• THD (third-party): 0.219% @ 90 dB SPL (weighted) vs not measured — comparison has independent data [5]

Comparison is provisional because the review target has no third-party measurements; on every documented axis the candidate is equivalent-or-better.

CP = 18 USD ÷ 35 USD = 0.51

Reliability & Support

The AT-701 was released in 1974 and has been discontinued for decades [1]. The original limited warranty has long since expired, and no current warranty applies to surviving secondhand units. Audio-Technica’s Service and Repair Center exists for current products but does not document service for this 50-year-old model, and original replacement parts (drivers, pads, cables, headband components) are not listed on Audio-Technica’s replacement parts pages. Manufacturer support is therefore effectively unavailable, with owners relying on third-party or DIY work for cable and pad replacement. Offsetting these factors, the construction is mechanically simple — a passive open-back dynamic transducer with few moving parts and a metal yoke/rail headband described as sturdy by collectors [2]. No statistical RMA or MTBF data exists. Cable rubber softening and foam pad deterioration are documented age-related issues but affect user-replaceable accessories rather than the core driver.

Rationality of Design Philosophy

Judged in its 1974 launch context, the AT-701 follows a practical and mostly rational passive headphone direction: a conventional moving-coil driver, open-back housing, low impedance compatible with period receiver headphone outputs, long fixed coiled cable, and mechanically simple construction [1][2]. No occult or non-scientific sound-quality claim is documented for this model, and the cost allocation appears directed to basic headphone function rather than decorative excess. At the same time, Audio-Technica did not publish a first-party design philosophy statement, white paper, measurement target, or proprietary method specific to the AT-701, and the open-back dynamic approach was already established before launch. The score is therefore neutral: reasonable as a functional 1970s product direction, but not demonstrably measurement-led, innovative, or unusually cost-optimized.

Advice

The AT-701 is a 50-year-old discontinued vintage stereophone with no manufacturer support, no spare-parts supply, no warranty, and no third-party measurement data. Surviving units commonly show foam pad deterioration and cable rubber softening, requiring DIY or third-party servicing. For listeners who simply want a wired open-back passive headphone, the Koss KSC75 at 18 USD provides a wider documented frequency response range and published THD figures for roughly half the price, with current production support and accessible third-party measurement coverage [4][5]. Purchase of the AT-701 today is rational only as a collector’s item; for actual listening use, a currently-produced model with documented measurement performance is the more reasonable choice.

References

[1] Audio-Technica - 50 years of headphone excellence - https://www.audio-technica.com/en-us/headphones-50th-anniversary - accessed 2026-04-28 [2] Head-Fi.org - Audio-Technica AT-701 Stereophone, Pics, Mini-Review - https://www.head-fi.org/threads/audio-technica-at-701-stereophone-pics-mini-review.653646/ - accessed 2026-04-28 (user-posted photos of unit markings: FR 30 Hz–20 kHz, impedance ~4–16 Ω; build description) [3] Vintaelec - AUDIO-TECHNICA AT-701 Stereophone Headphones - https://vintaelec.com/at-701 - accessed 2026-04-28 (current secondhand price USD 26.95–34.99) [4] Koss - KSC75 product page - https://koss.com/products/ksc75 - accessed 2026-04-28 (manufacturer specs: FR 15–25,000 Hz, sensitivity 101 dB SPL/mW, impedance 60 Ω, THD <0.2%) [5] RTINGS - Koss KSC75 Review - https://www.rtings.com/headphones/reviews/koss/ksc75 - accessed 2026-04-28 (third-party measurement: weighted THD 0.219% @ 90 dB SPL)

(2026.5.1)