/usr/share/jconvolver/config-files/spacenet/maeshowe-amb.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) 2007-2009 Fons Adriaensen <fons@linuxaudio.org>
#
# 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.
#
# -----------------------------------------------------------------------------
#
# jconvolver configuration -- Maes-Howe, Orkney, UK.
# --------------------------------------------------
#
# Origin of IR files: http://space-net.org.uk/node/51
#
# Description on the space-net site:
#
# Maes-Howe, Orkney, is one of the finest chambered cairns in Europe,
# and is dated to 3000BC. Prior work in the acoustics of ancient sites
# explores how the resonances exhibited therein might have affected
# regular human ritual and interaction with the space. It has been
# hypothesized that as these resonances are within the lower male vocal
# range, they may have been used in ritual to accentuate aspects of the
# voice. Unlike many similar ancient structures that have been studied
# to date, Maes Howe lends itself to the presence of strong modal
# frequencies. It is almost cubic in shape, of dimension 4.6m, with
# walls made from large, flat slabs of stone, resulting in smooth
# reflecting surfaces rather than more commonly found irregular placement
# of smaller stones.
#
# Location: Orkney, Scotland, UK
# Size (Approx): 100m3
#
# Source: Log. Swept Sine; 20-22k Hz; 15s long
# Input: Genelec S30D
# Source Location: Centre of chamber
# Mic Location: Centre of wall opposite entrance
# Source-Microphone Distance: 2m
# Microphone: Soundfield SPS-422B
#
# ISO 3382 - T30:
# Freq (Hz) 31.5 63 125 250 500 1k 2k 4k 8k 16k
# T30 (s) 0.75 0.79 0.87 0.60 0.57 0.51 0.46 0.42 0.37 0.30
#
# -----------------------------------------------------------------------------
#
# Comments (FA):
#
# The two original WAV files had a 6-line text preamble which had to
# be removed to make them readable as regular WAV files. They have
# been combined into a single 4-ch WAVEX file using makemulti, without
# any further changes. You can also use the two original files after
# removing the text preamble.
#
# Measuring and viewing the responses revealed what are probably gain
# errors in the equipment used to capture the responses. These are
# approximately corrected by the gain factors used below.
#
# The offset of 385 samples cuts off the direct sound and the first
# 5 ms of the response.
#
# -----------------------------------------------------------------------------
#
# Replace by whatever required...
#
/cd /audio/reverbs/spacenet
#
#
# in out partition maxsize
# -----------------------------------------------
/convolver/new 1 4 256 50000
#
#
/input/name 1 Input
#
/output/name 1 Out.W
/output/name 2 Out.X
/output/name 3 Out.Y
/output/name 4 Out.Z
#
#
# in out gain delay offset length chan file
# ---------------------------------------------------------------------
#
/impulse/read 1 1 0.30 0 385 0 1 MH3_000_WXYZ_48k.amb
/impulse/read 1 2 0.59 0 385 0 2 MH3_000_WXYZ_48k.amb
/impulse/read 1 3 0.48 0 385 0 3 MH3_000_WXYZ_48k.amb
/impulse/read 1 4 0.75 0 385 0 4 MH3_000_WXYZ_48k.amb
#
#
# Or using the original files:
#
#
#/impulse/read 1 1 0.30 0 385 0 1 MH3_000_WX_48k.wav
#/impulse/read 1 2 0.59 0 385 0 2 MH3_000_WX_48k.wav
#/impulse/read 1 3 0.48 0 385 0 1 MH3_000_YZ_48k.wav
#/impulse/read 1 4 0.75 0 385 0 2 MH3_000_YZ_48k.wav
#
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