DecayCore v1.0.6 — FIR Room Correction for convolution engines
[1.0.6] - 26-5-2026
Hybrid IIR + FIR bass correction — new feature
DecayCore can now combine a small set of IIR Peaking EQ biquad cuts with the standard FIR filter to handle the narrowest, most stubborn room modes more precisely.
- Targeted narrow-mode cuts: the hybrid stage detects confirmed modal peaks in the bass using confidence and group-delay excess thresholds, then designs conservative IIR cuts (no boosts ever). The FIR magnitude target is adjusted so the FIR corrects only what the IIR leaves behind.
- CamillaDSP integration: the designed biquads are exported as Peaking EQ filter entries in the CamillaDSP YAML configuration alongside the FIR convolver, ready to deploy as a two-stage pipeline.
- Conservative by default: disabled by default. Up to 3 cuts per channel, limited to the 20–150 Hz range, with minimum confidence and group-delay excess requirements. Controlled from the Advanced tab.
Adaptive Target — new target strategy
AUTO mode now offers three target selection strategies. The new Adaptive mode derives a custom target directly from room measurements instead of searching through built-in curves.
- Faster runs: skips the multi-curve search phase entirely. When you have a clear room measurement, Adaptive can reach a good starting filter significantly faster than the default search.
- Room-aware target synthesis: starts from a Harman6-style reference and adjusts bass buildup and tilt compensation based on what the measurement actually shows. When RT60 data is available (automatic with DecayCore's built-in measurement tool), the compensation is further refined using measured decay times across bass, mid, and treble bands.
- Best with built-in measurements: RT60 data is captured automatically when you measure with DecayCore's integrated tool. External REW or WAV imports typically do not include RT60 data — in that case, the
Auto: search best built-instrategy remains the safer and more thorough choice.
Bass Integration — Direct DAC improvements
- Dual subwoofer support: AUTO mode can now average two subwoofer measurements together before integration, improving reliability when two subs are in use.
- Allpass filter option: Direct DAC bass integration can now apply an allpass filter to improve sub-to-main phase alignment. The option is selectable from the UI and AUTO mode can choose it automatically.
- Smarter integration scoring: cancellation risk evaluation, guard band handling, and group-delay thresholds have all been tightened. More integration candidates are now correctly rejected before they reach the winner stage.
- Clearer rejection reasons: when a bass integration candidate is dropped, the reason is now logged explicitly so it is easy to understand why a particular configuration was ruled out.
Auto mode
- Winner rationale: AUTO mode now explains why a particular filter was selected, including the key factors that made it the winner. This appears in the diagnostics and search results sections.
- Per-run compute context: auto mode now builds a stable computation context at run start and caches intermediate results within that run, reducing redundant recalculation during long searches.
- Measurement metadata identity: the measurement identity is now tracked more precisely through DSP policy, ensuring the cache correctly separates results that differ only in measurement or policy details.
- Corrected the maximum safe boost cap to 8 dB for consistency across all code paths.
Measurement
- SNR (signal-to-noise ratio) and timing mode are now shown in the measurement summary after a built-in measurement session.
Performance / Cache
- Plot render cache is now cleared together with other runtime caches when a reset is triggered.
- Materialize cache is pruned when it grows too large, preventing unbounded memory use during long auto mode searches.
CamillaDSP
- Config file supports version > 4.xxx