Case study

ktctl: reconstructing FiiO JA11 USB equalizer control

ktctl reconstructs the FiiO JA11 runtime USB control protocol in a Rust CLI and TUI for five-band PEQ, presets and gain. Its protocol notes specify framing, CRC-8/MAXIM and command bytes derived from Android app analysis and device probing. The author reports a successful read, write and save round trip on a JA11.

Targets: Protocol
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-06
Evidence class: C2 code & docs, no demo or download

Stars: 2
Last commit: 2026-09-06
Language: Rust
License (GitHub): BlueOak-1.0.0

GitHub data as of 2026-11-10

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Evidence

Observed: Code, documentation and a demo observed; no download method found.
Checked: 2026-11-08

How evidence classes are assigned

Requirements & limits

Prerequisites: Rust 1.75+ and macOS or Linux; USB access requires a JA11 or compatible device.
Limits: JCALLY JM12 and Moondrop KT02H20 compatibility remains unconfirmed; master-gain encoding lacks audio confirmation.
License: Blue Oak Model License 1.0.0.

Cite

BibTeX

@misc{ktctl-ja11-case,
  title = {{ktctl: reconstructing FiiO JA11 USB equalizer control}},
  howpublished = {\url{https://github.com/ParkWardRR/fiio-ja11-jcally-jm12-moondropkt02-kt02h20-dac-amp-control}},
  url = {https://github.com/ParkWardRR/fiio-ja11-jcally-jm12-moondropkt02-kt02h20-dac-amp-control},
  urldate = {2026-11-06},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/ktctl-ja11-case/}}
}

Plain text

ktctl: reconstructing FiiO JA11 USB equalizer control. https://github.com/ParkWardRR/fiio-ja11-jcally-jm12-moondropkt02-kt02h20-dac-amp-control (accessed 2026-11-06). Awesome REA entry: https://awesomerea.org/resources/ktctl-ja11-case/

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About this entry

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Primary sources

README.md GitHub · ParkWardRR/fiio-ja11-jcally-jm12-moondropkt02-kt02h20-dac-amp-control · Revision c59b923
docs/PROTOCOL.md GitHub · ParkWardRR/fiio-ja11-jcally-jm12-moondropkt02-kt02h20-dac-amp-control · Revision c59b923