Reverse-engineering my speakers' API to get reasonable volume control

Original Article ↗ Hacker News Discussion ↗

Digital vs analog volume, loudness, and quality

  • Several comments dig into how digital volume control likely scales samples before the DAC; with 24‑bit outputs, moderate attenuation is fine, but very low volumes may risk quantization artifacts.
  • Others argue excessive digital attenuation plus high post‑DAC gain is worse for SNR than setting a sensible analog gain and using more of the digital range.
  • There’s praise for designs that adjust the DAC reference level instead of scaling samples.
  • Discussion of “loudness” controls: one amp’s recommended workflow (set a fixed max volume, then use a loudness knob) is seen as close to ideal, matching human perception better than flat gain changes.
  • Logarithmic volume curves and loudness compensation are repeatedly cited as generally mishandled in consumer products.

UX of volume controls (Spotify, iOS, Sonos, etc.)

  • iOS has a finer volume slider via long‑press in Control Center, including for Spotify Connect; this helps but still leaves only ~10% of slider travel usable for some setups.
  • People complain about coarse steps on phones, TVs, and smart speakers; even the lowest levels can be too loud.
  • Sonos is praised for allowing per‑speaker max volume limits, effectively increasing slider resolution.

Networked speakers and API / security issues

  • Many are surprised the speakers expose an unauthenticated HTTP API with filesystem and firmware access; this is viewed as a serious IoT security failure.
  • Some recommend network segmentation; the broader IoT ecosystem is criticized for weak or absent security.

Physical knobs and DIY hardware

  • Strong enthusiasm for standalone rotary controllers (ESP32‑based dials, open‑source haptic “smart knobs,” keyboard knobs, DIY SpaceMouse projects).
  • Several readers want mass‑market, programmable multi‑knob devices; others note current DIY designs are complex and expensive to productize.

Active vs passive speakers, headroom, and longevity

  • Debate over buying powerful active speakers vs passive speakers plus separate amp.
  • Pro‑passive side: amps and “smart” features die first; passive speakers last decades and are repairable, reducing e‑waste.
  • Pro‑active side: matched amps, active crossovers, built‑in EQ, protection limiters, and very long life in quality studio brands.
  • Headroom is defended: large speakers with ample power sound better at normal levels and avoid underpowered distortion.

General audio frustrations and tips

  • Complaints about low maximum gain and poor speakers in many laptops and Bluetooth devices; some see this as bad design, others as protection against damage and annoyance.
  • Tips shared: macOS Option+Shift for finer volume steps; Linux PulseAudio for per‑app gain; Chromecast‑/AirPlay‑style receivers or Raspberry Pi images (e.g., balena‑sound) as smarter, replaceable front‑ends for “dumb” amps and speakers.