Scope
Technical timeline of the I-House Pub K-array audio system, focused on the KA34 amplifier DSP/microcontroller firmware failure and its repair. This page records dates and observable facts only. It is a working record; see Known Outstanding Issues for items not yet resolved.
The pub audio path uses K-array Kommander-KA amplifiers (KA18, KA34) driven from a Q-SYS Core 110f. See qsys-control and now-playing-system for how the audio system connects to the pub platform.
Timeline
July 2025 — Prior issues raised through official channels
- Jul 2, 2025 — I-House help desk ticket #5384 filed, raising K-array
system issues:
- Inconsistent sound stage / poor low-frequency distribution (an additional subwoofer was proposed).
- System tuning problems ongoing since the pub opened, including insufficient volume during large events.
- Jul 3, 2025 — Ticket acknowledged by the help desk and escalated for management review.
May 2026 — KA34 amplifier DSP/firmware failure
- May 19, 2026 — KA34 unit observed in a failed state:
- Reports as
raspberrypi4-64in OsKar 2.4.9. - Micro version and DSP version fields blank.
- Audio passes through, but there is no DSP parameter control via the web UI or Q-SYS.
- Rear status light solid yellow, persisting through reboot.
- The unit had previously been running correctly.
- Reported to K-array official customer support requesting a microcontroller firmware flash.
- Reports as
- May 20–21, 2026 — K-array support engaged. Support requested purchase provenance for the warranty/assistance chain. Provenance documentation was unavailable (facilities head consulted, unsure). K-array confirmed support would proceed regardless.
- May 22, 2026 — Q-SYS integration testing using K-array’s official Q-SYS
driver:
- KA18 unit functional.
- KA34 returning HTTP 500 on all
/dsp/endpoints (INPATCH, MATRIX gain parameters) and on/v2/micro/status, consistent with non-functional DSP/microcontroller firmware. - Debug logs retained.
June 2026 — Reflash and remote support
- June 2026 — KA34 compute module reflashed via SD card image
(
oskar-image-2.4.9). Audio subsequently passing on all four output channels via Q-SYS. The IEB microcontroller firmware was still missing after the reflash (blank firmware versions in the web UI, continued 500 errors). - June 10, 2026 — Remote support session conducted with K-array (QuickSupport) for firmware repair.
July 2026 — Firmware restoration, preset configuration, and tuning
- IEB microcontroller firmware restored.
- DSP output presets configured: KU26_Natural (stage sub), KK52_Natural (banquet), GF42 / GH4 (bar right).
- KA34 unit identity corrected to match the hardware serial (
K146AS0036). - Sound-stage and tuning issues raised in ticket #5384 addressed through manual system tuning and sound-engineer consultation.
Configuration record
Two Kommander-KA .kamp2 configuration snapshots are available. They are not a
before/after pair of the same unit:
old.kamp2— configuration from the KA18 unit. Its embedded access-point name (K145AN0034) matches the KA18 serial.now.kamp2— the current configuration on the KA34 unit after reflash. Its embedded access-point name (K145AS0007) matches neither the KA18 (K145AN0034) nor the KA34’s actual hardware serial (K146AS0036). This is consistent with the SD image (oskar-image-2.4.9) originating from a different unit.
Resolved (July 2026) — unit identity mismatch. When this snapshot was captured, the KA34’s embedded serial / AP identity did not match its hardware serial (
K146AS0036). This was subsequently corrected with K-array support during the IEB firmware restoration.
No configuration snapshot of the KA34’s pre-failure state exists. The section
below therefore presents now.kamp2 as the current KA34 state and old.kamp2
as KA18 reference only — not as a KA34 “prior configuration.”
Both files are 8×8 DSP devices (Model 29). Routing in now.kamp2 is
straight-through: input n → output n (IN1→OUT1 … IN8→OUT8).
Current KA34 output configuration (now.kamp2)
| Output | Preset | Qty | Speaker impedance | Input routed |
|---|---|---|---|---|
| OUT1 | GF42_Natural | 1 | 8 Ω | IN1 |
| OUT2 | GF42_Natural | 1 | 8 Ω | IN2 |
| OUT3 | GF42_Natural | 2 | 8 Ω | IN3 |
| OUT4 | GF42_Natural | 1 | 8 Ω | IN4 |
| OUT5 | KU26_Natural | 1 | 8 Ω | IN5 |
| OUT6 | KU26_Natural | 1 | 8 Ω | IN6 |
| OUT7 | GH4_Natural | 1 | 4 Ω | IN7 |
| OUT8 | KK52_Natural | 2 | 16 Ω | IN8 |
KA18 reference configuration (old.kamp2)
Reference only — this is the KA18 unit’s configuration, not the KA34’s.
| Output | Preset | Qty | Speaker impedance |
|---|---|---|---|
| OUT1 | GF42_Natural | 1 | 8 Ω |
| OUT2 | GF42_Natural | 1 | 8 Ω |
| OUT3 | KZ14_Natural | 1 | 16 Ω |
| OUT4 | GF42_Natural | 1 | 8 Ω |
| OUT5 | KTR25_Natural | 1 | 4 Ω |
| OUT6 | KU26_Natural | 1 | 8 Ω |
| OUT7 | GH4_Natural | 1 | 4 Ω |
| OUT8 | KK52_Natural | 1 | 16 Ω |
Per the Kommander-KA user guide (V2.2): firmware updates via K-Monitor and loudspeaker factory-preset output configuration are standard, manufacturer-documented user procedures. Output presets must match the loudspeakers physically connected to each output channel.
Known outstanding issues (as of July 2026)
- One stage speaker non-functional.
The IEB microcontroller firmware restoration, DSP preset configuration, KA34 unit identity correction, and the ticket #5384 sound-stage/tuning issues were all resolved in July 2026 — see the July 2026 timeline entry.
Sources
old.kamp2— Kommander-KA configuration snapshot (KA18 unit).now.kamp2— Kommander-KA configuration snapshot (KA34 unit, post-reflash).KommanderKA_2RU_UG_V2_2.pdf— K-array Kommander-KA 2RU user guide, V2.2.Core_110f__1C8ZVFPU8TQECQF.txt— Q-SYS Core 110f design/configuration reference.- I-House help desk ticket #5384 (filed Jul 2, 2025).
- K-array customer support email thread “KA34 Firmware Flash” (May–Jun 2026).
- Q-SYS debug logs (May 22, 2026).
Related
- ihnyc-avi-pub-landing — I-House Pub Site
- qsys-control — Q-SYS / QRC device control
- now-playing-system — song-ID pipeline (audio source)