Crossfeed, Haas surround, PBE, AFR, compressor and dithering.
The rbcodec DSP pipeline runs between the codec output and the active sink.
All of these are bypassable; turn anything off by zeroing its enable flag.
Crossfeed
Mixes a delayed and filtered portion of one channel into the other to
simulate the spatial cues you’d get from loudspeakers. Particularly useful
on headphones with hard-panned mixes (older rock/jazz).
Setting
Storage
Range
Default
Type
crossfeed
off / meier / custom
off
Direct gain
crossfeed_direct_gain
−60..0 dB (step 5)
−15 dB
Cross gain
crossfeed_cross_gain
−120..−30 dB
−60 dB
HF attenuation
crossfeed_hf_attenuation
−240..−60 dB
−160 dB
HF cutoff
crossfeed_hf_cutoff
500..2000 Hz
700 Hz
Crossfeed can cause output distortion if its settings result in a combined
level that is too high.
Haas surround
Adds an adjustable delay between channels to widen the stereo image. Four
auxiliary controls move the perceived stage back toward the centre.
Setting
Storage
Range
Default
Enable
surround_enabled
0 / 5 / 8 / 10 / 15 / 30 ms
0 (off)
Balance
surround_balance
0..99 %
35 %
f(x1) HF cut
surround_fx1
600..8000 Hz (step 200)
3400 Hz
f(x2) LF cut
surround_fx2
40..400 Hz (step 40)
320 Hz
Side only
surround_method2
bool
false
Dry/wet mix
surround_mix
0..100 %
50 %
Perceptual Bass Enhancement (PBE)
Group-delay correction plus a biophonic EQ to boost low-end perception.
Setting
Storage
Range
Default
Strength
pbe
0..100 % (step 25)
0 % (off)
Precut
pbe_precut
−4.5..0 dB (step 0.1)
−2.5 dB
Auditory Fatigue Reduction (AFR)
Reduces energy in frequency bands the human ear is most sensitive to —
helpful for long listening sessions.
Setting
Values
Default
AFR enable
off / weak / moderate / strong
off
Compressor
Reduces dynamic range so quiet passages stay audible without loud passages
clipping.
Setting
Storage
Values / range
Default
Threshold
.threshold
off / −3 / −6 / −9 / −12 / −15 / −18 / −21 / −24 dB
Most decoders work at higher than 16-bit precision; dithering adds a small
shaped noise signal before truncation so the residual is uniform rather
than signal-correlated. Most useful with classical music and other
high-dynamic-range material.
dithering_enabled = true
Algorithm: high-pass triangular distribution (HPTPDF)
Noise shaper: third order, biased above ~10 kHz
⌘I
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