Overview

The Audio-Technica AT-704 is a passive wired open-back headphone from the AT-700 series, Audio-Technica’s inaugural headphone lineup introduced in 1974 [2]. The series was developed in-house, building on over a decade of phono cartridge transducer engineering. Within the AT-700 dynamic tier, the AT-704 is distinguished from siblings AT-701, AT-702, and AT-703 primarily by its jeans-patterned textile headband and gold housing with coordinated brown ear pads — an aesthetic emphasis rather than a technical one [3][5]. Discontinued for approximately 50 years, the AT-704 is available only through Japanese secondhand markets and is considered a rare collector’s item with no current authorized sales channel [4].

Scientific Validity

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No third-party measurements or manufacturer audio performance specifications are available for objective evaluation of this discontinued circa-1974 product.

Technology Level

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The AT-700 series was developed in-house by Audio-Technica, which represents the sole positive factor in this assessment [2]. Every technology employed in the AT-704 — moving-coil dynamic driver, open-back enclosure, fixed coiled cable, and fully passive construction — was standard commodity industry technology before 1974 and is now over 50 years outdated. No proprietary patents have been identified for this product or the AT-700 headphone line [3].

The AT-704’s only documented differentiator within its dynamic series siblings is the jeans-patterned textile headband, a cosmetic feature with no audio performance relevance [3][5]. No technical advancement over sibling models is documented; the AT-704 appears to be an aesthetic variant within the series rather than a performance tier. The design contains no active electronics, no DSP, and no digital integration of any kind. All components are fully commoditized, and any current manufacturer could replicate the entire design immediately. From a 2026 evaluation baseline, this score reflects a product that represents historical record rather than engineering advancement.

Cost-Performance

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

CP = 0.5 (insufficient performance data for comparison)

No third-party measurements or manufacturer audio performance specifications exist for the AT-704. Cost-performance cannot be evaluated due to the absence of a performance baseline required to establish equivalence with any comparison product. The AT-704 is available only on secondhand markets; tested working units in the Japanese market convert to approximately USD 165 to 333 at current exchange rates, with no active US market listings confirmed as of the review date [4].

Reliability & Support

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The AT-704 has been discontinued for approximately 50 years. No original warranty remains applicable, and Audio-Technica’s current support infrastructure is documented as covering active products only — no confirmed manufacturer repair service exists for this model [1]. Third-party vintage audio technicians are the only practical service option.

The fully passive design carries no active electronics, providing inherent resistance to electronic component failure. However, the fixed non-detachable coiled cable is the primary documented failure mode for AT-700 series headphones: flex fatigue at the cable entry causes single-channel dropout requiring specialist rewiring, with no user-replaceable solution. Universal consumable degradation — ear pad disintegration, headband material breakdown, and internal cable insulation deterioration — is expected at 50+ years of age. The AT-704B variant’s leather headband straps carry additional delamination risk [4].

Rationality of Design Philosophy

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Available documentation indicates the AT-704’s design philosophy prioritizes aesthetic differentiation over audio performance. The product’s primary documented differentiator within the AT-700 dynamic series is the jeans-patterned textile headband, a cosmetic choice confirmed across all secondary sources [3][5]. No technical specifications distinguishing the AT-704 from its series siblings have been found, indicating design costs were allocated predominantly toward aesthetics rather than measurable performance improvement.

The design employs entirely conventional pre-1974 technology: moving-coil dynamic driver and open-back enclosure, both established industry-standard implementations with no proprietary acoustic innovations. No measurement-focused engineering approach, no active electronics, and no digital integration are in evidence. This represents a fully conservative design with no documented contribution to audio performance advancement.

Advice

The AT-704 has no available measurements, no accessible manufacturer specifications, no remaining warranty, and no confirmed manufacturer repair support. Units available on the secondhand market at approximately USD 165 to 333 [4] carry documented cable failure risk and near-universal consumable degradation inherent to 50-year-old hardware.

For anyone seeking open-back wired headphone performance, current-production alternatives with documented third-party measurements deliver verifiably superior performance at prices substantially below the AT-704’s secondhand market range. There is no performance basis on which to recommend the AT-704 for audio listening purposes.

The AT-704 is appropriate exclusively for collectors with specific historical interest in Audio-Technica’s inaugural headphone lineup as a design artifact. Even for this purpose, prospective buyers should account for professional cable servicing as a near-certain requirement on any surviving unit.

References

[1] Audio-Technica - Headphones (US) - https://www.audio-technica.com/en-us/headphones - accessed 2026-04-28 - AT-704 not listed; confirms product is discontinued

[2] Audio-Technica - 50 Years of Headphone Excellence - https://www.audio-technica.com/en-us/headphones-50th-anniversary - accessed 2026-04-28 - Confirms AT-700 series as Audio-Technica’s first headphone family, introduced 1974; developed from phono cartridge engineering heritage

[3] Head-Fi.org - “Audio Technica the master of WOOD” forum thread, Page 4 - https://www.head-fi.org/threads/audio-technica-the-master-of-wood.928704/page-4 - accessed 2026-04-28 - AT-704 identified as fourth Audio-Technica headphone; first with denim/leather-style straps; AT-701/702/703 confirmed as dynamic open-back

[4] HiFiShark - Audio-Technica AT-704 search - https://www.hifishark.com/search?q=audio-technica+AT-704 - accessed 2026-04-28 - 16 expired listings; Japanese market working units approximately USD 167-333; European listings EUR 369-800; no active listings as of review date

[5] note.com/whsh225 - ジーンズ調のヘッドホン！audio-technicaのヘッドホンAT-704を紹介・レビューします！ [JA] - https://note.com/whsh225/n/nf276f554180a - accessed 2026-04-28 - Japanese review article (partial access; paywalled); confirms denim headband, gold housing, brown ear pads, coiled 6.35mm cable

(2026.5.1)