/usr/share/jconvolver/config-files/ambisonic/super-stereo.conf is in jconvolver-config-files 0.9.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright (C) 2010 Joern Nettingsmeier
# Adapted to use built-in Hilbert IR by Fons Adriaensen
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
# -----------------------------------------------------------------------------
#
# "Super-Stereo", by Michael A. Gerzon (according to a sursound posting
# by Richard Lee), as used on MINIM Ambisonic decoders.
#
# This matrix converts a normal stereo signal into horizontal B-format for
# Ambisonic playback, creating a wider sound stage by wrapping the image
# around the listener.
#
# M = L + R, S = L - R
#
# W = 0.3667 M + j 0.3586 S
# X = 0.5290 M - j 0.4040 S
# Y = S
#
# The 'j' coefficient denotes a +90 degrees phase shift, implemented
# using a Hilbert transform IR. As this introduces latency, it is
# essential to delay the real part accordingly. The Hilbert transform
# used here has a lenght of 4096 samples and a delay of 2048 samples.
#
#
# in out partition maxsize density
# ----------------------------------------------------------
/convolver/new 2 3 256 4096 1.0
#
# num port name connect to
# -----------------------------------------------
/input/name 1 In.L
/input/name 2 In.R
#
/output/name 1 Out.W
/output/name 2 Out.X
/output/name 3 Out.Y
#
# in out gain delay offset length chan file
# -----------------------------------------------------------------------------
# L -> W
/impulse/dirac 1 1 0.3667 2048
/impulse/hilbert 1 1 0.3586 2048 4096
# R -> W
/impulse/dirac 2 1 0.3667 2048
/impulse/hilbert 2 1 -0.3586 2048 4096
# L -> X
/impulse/dirac 1 2 0.5290 2048
/impulse/hilbert 1 2 -0.4040 2048 4096
# R -> X
/impulse/dirac 2 2 0.5290 2048
/impulse/hilbert 2 2 0.4040 2048 4096
# L -> Y
/impulse/dirac 1 3 1.0000 2048
# R -> Y
/impulse/dirac 2 3 -1.0000 2048
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