Fostex ET-TH4.4BL is an optional balanced cable for TH-series headphones with 2-pin bayonet earcup connectors — compatible with the TH909, TH900mk2, TH610, and TH616. It runs from a 4.4 mm TRRRS (5-pole Pentaconn) plug at the amplifier end to two separate 2-pin bayonet connectors at the earcup end — the same locking system used by the factory cables ET-H3.0N7UB and ET-H3.0N7BL. The conductor is 7N-grade OFC (99.99999% purity), the jacket is flexible PVC, and the length is 2.0 m.
ET-TH4.4BL vs ET-TH4.4BL2Y — the earcup connector distinction
ET-TH4.4BL serves the older TH generation with 2-pin bayonet cup connectors: TH909, TH900mk2, TH610, and TH616. The separately listed ET-TH4.4BL2Y serves the new generation — TH910, TH919, TH1000RPmk2, TH1100RPmk2 — which uses individual 3.5 mm TS plugs per earcup. Both cables share the same 4.4 mm Pentaconn source plug and the same OFC conductor spec, but the earcup connectors are not interchangeable. Confirm the headphone generation before ordering. The balanced 4.4 mm path carries left and right channels on fully isolated conductor pairs with no shared ground return. At 25 Ω (TH909, TH900mk2) and 150 Ω (TH610/TH616), this produces a measurable improvement in channel separation and in-band noise floor compared to a single-ended connection — the difference is audible on high-resolution source material.7N OFC and internal wiring consistency
Fostex specifies 7N-grade OFC for the internal wiring of the TH909 and TH900mk2 and for the stock ET-H3.0N7UB cable shipped with those models. The ET-TH4.4BL continues that conductor specification, changing only the source-end termination from unbalanced 6.3 mm TRS to balanced 4.4 mm Pentaconn. This keeps the external cable electrically matched to the headphone's internal signal path. Gold-plated connectors at both ends protect contact surfaces from oxidation under normal listening and studio use conditions.KEY FEATURES
- 4.4 mm 5-pole balanced Pentaconn (TRRRS) connector — fully balanced signal path
- Dual 2-pin bayonet earcup connectors — compatible with TH909, TH900mk2, TH610, TH616
- 7N-grade OFC conductor (99.99999% purity) — matched to headphone internal wiring specification
- Gold-plated connectors at both ends — corrosion resistance and reliable electrical contact
- Flexible PVC jacket — consistent handling during daily use
- Length: 2.0 m
TECHNICAL SPECIFICATIONS
- Model: ET-TH4.4BL
- Type: Balanced cable
- Source connector: 4.4 mm TRRRS (5-pole Pentaconn), gold-plated
- Headphone connectors: 2x 2-pin bayonet, gold-plated
- Conductor: 7N-grade OFC (99.99999% purity)
- Jacket: Flexible PVC
- Length: 2.0 m
- Compatible models: TH909, TH900mk2, TH610, TH616
